[MINOR] Cleanup various issues raised by static code analysis, part 2

Project: http://git-wip-us.apache.org/repos/asf/systemml/repo
Commit: http://git-wip-us.apache.org/repos/asf/systemml/commit/13a01758
Tree: http://git-wip-us.apache.org/repos/asf/systemml/tree/13a01758
Diff: http://git-wip-us.apache.org/repos/asf/systemml/diff/13a01758

Branch: refs/heads/master
Commit: 13a017583e84296769c2d28b7ae9c75e62f412b1
Parents: 40dd894
Author: Matthias Boehm <[email protected]>
Authored: Wed Oct 11 00:11:52 2017 -0700
Committer: Matthias Boehm <[email protected]>
Committed: Wed Oct 11 00:11:52 2017 -0700

----------------------------------------------------------------------
 .../apache/sysml/api/mlcontext/FrameSchema.java | 17 ++--
 .../sysml/debug/DMLDebuggerFunctions.java       | 14 +---
 .../java/org/apache/sysml/hops/AggUnaryOp.java  |  2 +-
 .../java/org/apache/sysml/hops/BinaryOp.java    |  2 +-
 .../org/apache/sysml/hops/ConvolutionOp.java    | 13 ++--
 .../java/org/apache/sysml/hops/IndexingOp.java  |  5 +-
 .../org/apache/sysml/hops/LeftIndexingOp.java   |  2 +-
 .../apache/sysml/hops/cost/CostEstimator.java   | 14 ++--
 .../hops/cost/CostEstimatorStaticRuntime.java   | 25 +++---
 .../ipa/IPAPassPropagateReplaceLiterals.java    |  4 +-
 .../sysml/hops/ipa/InterProceduralAnalysis.java | 18 ++---
 .../RewriteAlgebraicSimplificationDynamic.java  | 82 ++++++++++----------
 .../RewriteAlgebraicSimplificationStatic.java   | 64 +++++++--------
 .../hops/rewrite/RewriteConstantFolding.java    | 21 ++---
 .../rewrite/RewriteForLoopVectorization.java    |  8 +-
 .../rewrite/RewriteIndexingVectorization.java   |  4 +-
 .../RewriteMarkLoopVariablesUpdateInPlace.java  |  2 +-
 .../RewriteMatrixMultChainOptimization.java     | 10 +--
 .../RewriteSplitDagDataDependentOperators.java  |  6 +-
 .../sysml/lops/CumulativeOffsetBinary.java      |  2 +-
 .../sysml/lops/CumulativeSplitAggregate.java    |  3 +-
 .../java/org/apache/sysml/lops/ZeroOut.java     |  5 +-
 .../java/org/apache/sysml/lops/compile/Dag.java |  4 +-
 .../sysml/parser/BuiltinFunctionExpression.java | 14 ++--
 .../org/apache/sysml/parser/DMLTranslator.java  | 11 ++-
 .../apache/sysml/parser/ForStatementBlock.java  |  2 +-
 .../sysml/parser/LiveVariableAnalysis.java      |  2 +-
 .../sysml/parser/ParForStatementBlock.java      | 16 ++--
 .../sysml/parser/dml/DMLParserWrapper.java      |  2 +-
 .../sysml/parser/dml/DmlSyntacticValidator.java |  4 +-
 .../sysml/parser/pydml/PyDMLParserWrapper.java  |  2 +-
 .../parser/pydml/PydmlSyntacticValidator.java   |  8 +-
 .../sysml/runtime/codegen/SpoofCellwise.java    |  2 +-
 .../runtime/codegen/SpoofOuterProduct.java      |  4 +-
 .../sysml/runtime/codegen/SpoofRowwise.java     |  2 +-
 .../runtime/compress/CompressedMatrixBlock.java |  5 +-
 .../ColumnGroupPartitionerBinPacking.java       |  2 +-
 .../controlprogram/ParForProgramBlock.java      | 12 +--
 .../runtime/controlprogram/ProgramBlock.java    |  2 +-
 .../context/ExecutionContext.java               |  2 +-
 .../context/SparkExecutionContext.java          |  2 +-
 .../parfor/DataPartitionerLocal.java            |  6 +-
 .../controlprogram/parfor/ProgramConverter.java |  2 +-
 .../parfor/RemoteParForColocatedFileSplit.java  |  4 +-
 .../parfor/ResultMergeLocalFile.java            | 12 +--
 .../parfor/ResultMergeLocalMemory.java          | 18 ++---
 .../parfor/ResultMergeRemoteSpark.java          |  4 +-
 .../parfor/opt/OptimizerConstrained.java        |  3 +-
 .../parfor/opt/OptimizerRuleBased.java          | 10 +--
 .../runtime/functionobjects/IntegerDivide.java  |  2 +-
 .../functionobjects/ParameterizedBuiltin.java   |  2 +-
 .../runtime/instructions/MRJobInstruction.java  |  6 +-
 .../cp/ConvolutionCPInstruction.java            | 31 +++-----
 .../cp/DataPartitionCPInstruction.java          |  8 +-
 .../instructions/cp/VariableCPInstruction.java  |  4 +-
 .../ParameterizedBuiltinCPFileInstruction.java  |  4 +-
 .../gpu/AggregateBinaryGPUInstruction.java      |  6 +-
 .../gpu/ConvolutionGPUInstruction.java          |  5 +-
 .../gpu/MatrixMatrixAxpyGPUInstruction.java     |  4 +-
 .../instructions/gpu/context/JCudaKernels.java  |  2 +-
 .../spark/ConvolutionSPInstruction.java         | 21 ++---
 .../spark/FrameAppendMSPInstruction.java        |  3 +-
 .../spark/FrameIndexingSPInstruction.java       |  5 +-
 .../spark/MatrixAppendMSPInstruction.java       |  2 +-
 ...ReturnParameterizedBuiltinSPInstruction.java |  4 +-
 .../spark/QuantilePickSPInstruction.java        |  4 +-
 .../instructions/spark/SpoofSPInstruction.java  |  4 +-
 .../spark/TernarySPInstruction.java             |  6 +-
 .../instructions/spark/Tsmm2SPInstruction.java  |  3 +-
 .../instructions/spark/WriteSPInstruction.java  |  2 +-
 .../spark/utils/FrameRDDConverterUtils.java     |  2 +-
 .../spark/utils/RDDConverterUtils.java          | 12 +--
 .../spark/utils/RDDConverterUtilsExt.java       |  4 +-
 .../runtime/io/FrameReaderBinaryBlock.java      |  2 +-
 .../sysml/runtime/io/FrameReaderTextCell.java   |  6 +-
 .../runtime/io/FrameWriterBinaryBlock.java      |  2 +-
 .../sysml/runtime/io/FrameWriterTextCSV.java    |  2 +-
 .../sysml/runtime/io/FrameWriterTextCell.java   |  2 +-
 .../sysml/runtime/io/ReaderBinaryBlock.java     |  2 +-
 .../sysml/runtime/io/ReaderBinaryCell.java      |  2 +-
 .../apache/sysml/runtime/io/ReaderTextCSV.java  |  6 +-
 .../apache/sysml/runtime/io/ReaderTextCell.java |  6 +-
 .../sysml/runtime/io/WriterBinaryBlock.java     |  4 +-
 .../sysml/runtime/io/WriterMatrixMarket.java    |  4 +-
 .../apache/sysml/runtime/io/WriterTextCSV.java  |  2 +-
 .../apache/sysml/runtime/io/WriterTextCell.java |  2 +-
 .../org/apache/sysml/runtime/matrix/SortMR.java |  2 +-
 .../matrix/data/ConvolutionParameters.java      |  5 +-
 .../sysml/runtime/matrix/data/FrameBlock.java   |  2 +-
 .../runtime/matrix/data/LibMatrixBincell.java   |  2 +-
 .../matrix/data/LibMatrixDNNConv2dHelper.java   |  4 +-
 .../runtime/matrix/data/LibMatrixMult.java      | 14 ++--
 .../runtime/matrix/data/LibMatrixReorg.java     |  2 +-
 .../sysml/runtime/matrix/data/MatrixBlock.java  | 18 ++---
 .../mapred/MRBaseForCommonInstructions.java     |  2 +-
 .../matrix/sort/PickFromCompactInputFormat.java | 12 ++-
 .../apache/sysml/udf/lib/SGDNesterovUpdate.java | 11 +--
 .../org/apache/sysml/yarn/DMLYarnClient.java    |  8 +-
 .../test/integration/AutomatedTestBase.java     |  2 +-
 .../functions/io/FullDynWriteTest.java          | 22 +-----
 .../functions/jmlc/FrameCastingTest.java        |  2 +-
 .../functions/jmlc/FrameReadMetaTest.java       |  4 +-
 .../parfor/ParForRepeatedOptimizationTest.java  | 14 +---
 103 files changed, 355 insertions(+), 439 deletions(-)
----------------------------------------------------------------------


http://git-wip-us.apache.org/repos/asf/systemml/blob/13a01758/src/main/java/org/apache/sysml/api/mlcontext/FrameSchema.java
----------------------------------------------------------------------
diff --git a/src/main/java/org/apache/sysml/api/mlcontext/FrameSchema.java 
b/src/main/java/org/apache/sysml/api/mlcontext/FrameSchema.java
index 9c6137b..32dec57 100644
--- a/src/main/java/org/apache/sysml/api/mlcontext/FrameSchema.java
+++ b/src/main/java/org/apache/sysml/api/mlcontext/FrameSchema.java
@@ -19,8 +19,9 @@
 
 package org.apache.sysml.api.mlcontext;
 
-import java.util.ArrayList;
+import java.util.Arrays;
 import java.util.List;
+import java.util.stream.Collectors;
 
 import org.apache.commons.lang3.StringUtils;
 import org.apache.sysml.parser.Expression.ValueType;
@@ -94,16 +95,12 @@ public class FrameSchema {
         *            the frame schema as a string
         * @return the frame schema as a list of {@code ValueType} values
         */
-       private List<ValueType> schemaStringToListOfValueTypes(String 
schemaString) {
-               if (StringUtils.isBlank(schemaString)) {
+       private static List<ValueType> schemaStringToListOfValueTypes(String 
schemaString) {
+               if (StringUtils.isBlank(schemaString))
                        return null;
-               }
-               String[] cols = schemaString.split(",");
-               List<ValueType> list = new ArrayList<>();
-               for (String col : cols) {
-                       list.add(ValueType.valueOf(col.toUpperCase()));
-               }
-               return list;
+               return Arrays.stream(schemaString.split(","))
+                       .map(s -> ValueType.valueOf(s.toUpperCase()))
+                       .collect(Collectors.toList());
        }
 
        /**

http://git-wip-us.apache.org/repos/asf/systemml/blob/13a01758/src/main/java/org/apache/sysml/debug/DMLDebuggerFunctions.java
----------------------------------------------------------------------
diff --git a/src/main/java/org/apache/sysml/debug/DMLDebuggerFunctions.java 
b/src/main/java/org/apache/sysml/debug/DMLDebuggerFunctions.java
index 09bb0d6..3b75d4b 100644
--- a/src/main/java/org/apache/sysml/debug/DMLDebuggerFunctions.java
+++ b/src/main/java/org/apache/sysml/debug/DMLDebuggerFunctions.java
@@ -567,16 +567,8 @@ public class DMLDebuggerFunctions {
                return range;
        }
        
-       /**
-        * Returns minimum between two integers
-        * @param a Integer value 
-        * @param b Integer value
-        * @return Minimum between a and b.
-        */
-       private int min(int a, int b) {
-               if (a < b)
-                       return a;
-               return b;
+       private static int min(int a, int b) {
+               return Math.min(a, b);
        }
        
        /**
@@ -585,7 +577,7 @@ public class DMLDebuggerFunctions {
         * @param rowIndex if rowIndex == -1, then prints all rows
         * @param colIndex if colIndex == -1, then prints all columns
         */
-       private void prettyPrintMatrixBlock(MatrixBlock mb, int rowIndex, int 
colIndex) {
+       private static void prettyPrintMatrixBlock(MatrixBlock mb, int 
rowIndex, int colIndex) {
                if(rowIndex <= 0 && colIndex <= 0) {
                        // Print entire matrix
                        for(int i=0; i<min(mb.getNumRows(), DISPLAY_MAX_ROWS); 
i++) {

http://git-wip-us.apache.org/repos/asf/systemml/blob/13a01758/src/main/java/org/apache/sysml/hops/AggUnaryOp.java
----------------------------------------------------------------------
diff --git a/src/main/java/org/apache/sysml/hops/AggUnaryOp.java 
b/src/main/java/org/apache/sysml/hops/AggUnaryOp.java
index 4f5e2bc..04a32bd 100644
--- a/src/main/java/org/apache/sysml/hops/AggUnaryOp.java
+++ b/src/main/java/org/apache/sysml/hops/AggUnaryOp.java
@@ -491,7 +491,7 @@ public class AggUnaryOp extends Hop implements 
MultiThreadedHop
                return _etype;
        }
 
-       private boolean requiresAggregation( Hop input, Direction dir ) 
+       private static boolean requiresAggregation( Hop input, Direction dir ) 
        {
                if( !ALLOW_UNARYAGG_WO_FINAL_AGG )
                        return false; //customization not allowed

http://git-wip-us.apache.org/repos/asf/systemml/blob/13a01758/src/main/java/org/apache/sysml/hops/BinaryOp.java
----------------------------------------------------------------------
diff --git a/src/main/java/org/apache/sysml/hops/BinaryOp.java 
b/src/main/java/org/apache/sysml/hops/BinaryOp.java
index 97ec655..58bbc8f 100644
--- a/src/main/java/org/apache/sysml/hops/BinaryOp.java
+++ b/src/main/java/org/apache/sysml/hops/BinaryOp.java
@@ -1384,7 +1384,7 @@ public class BinaryOp extends Hop
                                ||(left.getDim1() > 1 && right.getDim1()==1 && 
left.getDim1()>=left.getRowsInBlock() )); //row MV and more than 1 block
        }
 
-       private MMBinaryMethod optFindMMBinaryMethodSpark(Hop left, Hop right) {
+       private static MMBinaryMethod optFindMMBinaryMethodSpark(Hop left, Hop 
right) {
                long m1_dim1 = left.getDim1();
                long m1_dim2 = left.getDim2();
                long m2_dim1 =  right.getDim1();

http://git-wip-us.apache.org/repos/asf/systemml/blob/13a01758/src/main/java/org/apache/sysml/hops/ConvolutionOp.java
----------------------------------------------------------------------
diff --git a/src/main/java/org/apache/sysml/hops/ConvolutionOp.java 
b/src/main/java/org/apache/sysml/hops/ConvolutionOp.java
index 849b694..e732fb8 100644
--- a/src/main/java/org/apache/sysml/hops/ConvolutionOp.java
+++ b/src/main/java/org/apache/sysml/hops/ConvolutionOp.java
@@ -75,8 +75,7 @@ public class ConvolutionOp extends Hop  implements 
MultiThreadedHop
                return "" + HopsConv2Lops.get(op);
        }
 
-       private boolean isEligibleForSpark() {
-               // return (op == ConvOp.DIRECT_CONV2D || op == 
ConvOp.MAX_POOLING) ? true : false;
+       private static boolean isEligibleForSpark() {
                return false;
        }
        
@@ -146,11 +145,11 @@ public class ConvolutionOp extends Hop  implements 
MultiThreadedHop
                }
        }
        
-       private boolean isInputReLU(Hop input) {
+       private static boolean isInputReLU(Hop input) {
                return input instanceof UnaryOp && ((UnaryOp) input).getOp() == 
OpOp1.SELP;
        }
        
-       private boolean isInputConv2d(Hop input) {
+       private static boolean isInputConv2d(Hop input) {
                return input instanceof ConvolutionOp && ((ConvolutionOp) 
input).getOp() == ConvOp.DIRECT_CONV2D;
        }
        
@@ -712,19 +711,19 @@ public class ConvolutionOp extends Hop  implements 
MultiThreadedHop
                return ret;
        }
        
-       private long nonNegativeMultiply(long val1, long val2, long val3) {
+       private static long nonNegativeMultiply(long val1, long val2, long 
val3) {
                if(val1 >= 0 && val2 >= 0 && val3 >= 0) {
                        return val1 * val2 * val3;
                }
                else return -1;
        }
-       private long nonNegativeMultiply(long val1, long val2) {
+       private static long nonNegativeMultiply(long val1, long val2) {
                if(val1 >= 0 && val2 >= 0) {
                        return val1 * val2;
                }
                else return -1;
        }
-       private long getNonNegative(long val1, long val2) {
+       private static long getNonNegative(long val1, long val2) {
                if(val1 >= 0 && val2 >= 0) {
                        if(val1 == val2) return val1;
                        else throw new RuntimeException("Incorrect dimensions 
in Convolution Hop: " + val1 + " != " + val2);

http://git-wip-us.apache.org/repos/asf/systemml/blob/13a01758/src/main/java/org/apache/sysml/hops/IndexingOp.java
----------------------------------------------------------------------
diff --git a/src/main/java/org/apache/sysml/hops/IndexingOp.java 
b/src/main/java/org/apache/sysml/hops/IndexingOp.java
index 0aa6d03..23d0630 100644
--- a/src/main/java/org/apache/sysml/hops/IndexingOp.java
+++ b/src/main/java/org/apache/sysml/hops/IndexingOp.java
@@ -287,7 +287,7 @@ public class IndexingOp extends Hop
         * @param ubound uppser bound high-level operator
         * @return true if block indexing expression
         */
-       private boolean isBlockIndexingExpression(Hop lbound, Hop ubound) 
+       private static boolean isBlockIndexingExpression(Hop lbound, Hop 
ubound) 
        {
                boolean ret = false;
                LiteralOp constant = null;
@@ -351,8 +351,7 @@ public class IndexingOp extends Hop
                return OptimizerUtils.isIndexingRangeBlockAligned(rl, ru, cl, 
cu, brlen, bclen);
        }
 
-       private long getBlockIndexingExpressionSize(Hop lbound, Hop ubound) 
-       {
+       private static long getBlockIndexingExpressionSize(Hop lbound, Hop 
ubound) {
                //NOTE: ensure consistency with isBlockIndexingExpression
                LiteralOp c = (LiteralOp) ubound.getInput().get(0); //(c*i)
                return HopRewriteUtils.getIntValueSafe(c);

http://git-wip-us.apache.org/repos/asf/systemml/blob/13a01758/src/main/java/org/apache/sysml/hops/LeftIndexingOp.java
----------------------------------------------------------------------
diff --git a/src/main/java/org/apache/sysml/hops/LeftIndexingOp.java 
b/src/main/java/org/apache/sysml/hops/LeftIndexingOp.java
index f3c6614..a660d24 100644
--- a/src/main/java/org/apache/sysml/hops/LeftIndexingOp.java
+++ b/src/main/java/org/apache/sysml/hops/LeftIndexingOp.java
@@ -243,7 +243,7 @@ public class LeftIndexingOp  extends Hop
                return (rightHandSide.getDataType() == DataType.SCALAR);
        }
        
-       private LixCacheType getSpLixCacheType(LeftIndexingMethod method) {
+       private static LixCacheType getSpLixCacheType(LeftIndexingMethod 
method) {
                switch( method ) {
                        case SP_MLEFTINDEX_L: return LixCacheType.LEFT;
                        case SP_MLEFTINDEX_R: return LixCacheType.RIGHT;

http://git-wip-us.apache.org/repos/asf/systemml/blob/13a01758/src/main/java/org/apache/sysml/hops/cost/CostEstimator.java
----------------------------------------------------------------------
diff --git a/src/main/java/org/apache/sysml/hops/cost/CostEstimator.java 
b/src/main/java/org/apache/sysml/hops/cost/CostEstimator.java
index 9f46eb0..ea1e3d6 100644
--- a/src/main/java/org/apache/sysml/hops/cost/CostEstimator.java
+++ b/src/main/java/org/apache/sysml/hops/cost/CostEstimator.java
@@ -217,7 +217,7 @@ public abstract class CostEstimator
                return ret;
        }
        
-       private void maintainVariableStatistics( LocalVariableMap vars, 
HashMap<String, VarStats> stats ) 
+       private static void maintainVariableStatistics( LocalVariableMap vars, 
HashMap<String, VarStats> stats ) 
                throws DMLRuntimeException
        {
                for( String varname : vars.keySet() )
@@ -246,7 +246,7 @@ public abstract class CostEstimator
                }
        }
        
-       private void maintainCPInstVariableStatistics( CPInstruction inst, 
HashMap<String, VarStats> stats )
+       private static void maintainCPInstVariableStatistics( CPInstruction 
inst, HashMap<String, VarStats> stats )
        {
                if( inst instanceof VariableCPInstruction )
                {
@@ -427,7 +427,7 @@ public abstract class CostEstimator
                return ret;
        }
        
-       private Object[] extractCPInstStatistics( Instruction inst, 
HashMap<String, VarStats> stats )
+       private static Object[] extractCPInstStatistics( Instruction inst, 
HashMap<String, VarStats> stats )
        {               
                Object[] ret = new Object[2]; //stats, attrs
                VarStats[] vs = new VarStats[3];
@@ -575,13 +575,13 @@ public abstract class CostEstimator
                return ret;
        }
        
-       private void setUnknownStats(VarStats[] vs) {
+       private static void setUnknownStats(VarStats[] vs) {
                vs[0] = _unknownStats;
                vs[1] = _unknownStats;
                vs[2] = _unknownStats;  
        }
        
-       private Object[] extractMRJobInstStatistics( Instruction inst, 
HashMap<String, VarStats> stats )
+       private static Object[] extractMRJobInstStatistics( Instruction inst, 
HashMap<String, VarStats> stats )
        {
                Object[] ret = new Object[2]; //stats, attrs
                VarStats[] vs = null;
@@ -614,7 +614,7 @@ public abstract class CostEstimator
                return ret;
        }       
        
-       private void cleanupMRJobVariableStatistics( Instruction inst, 
HashMap<String, VarStats> stats )
+       private static void cleanupMRJobVariableStatistics( Instruction inst, 
HashMap<String, VarStats> stats )
        {
                MRJobInstruction jinst = (MRJobInstruction)inst;
                
@@ -634,7 +634,7 @@ public abstract class CostEstimator
                }
        }
        
-       private long getNumIterations(HashMap<String,VarStats> stats, 
ForProgramBlock pb) {
+       private static long getNumIterations(HashMap<String,VarStats> stats, 
ForProgramBlock pb) {
                return OptimizerUtils.getNumIterations(pb, DEFAULT_NUMITER);
        }
 

http://git-wip-us.apache.org/repos/asf/systemml/blob/13a01758/src/main/java/org/apache/sysml/hops/cost/CostEstimatorStaticRuntime.java
----------------------------------------------------------------------
diff --git 
a/src/main/java/org/apache/sysml/hops/cost/CostEstimatorStaticRuntime.java 
b/src/main/java/org/apache/sysml/hops/cost/CostEstimatorStaticRuntime.java
index ef89600..f3ce99d 100644
--- a/src/main/java/org/apache/sysml/hops/cost/CostEstimatorStaticRuntime.java
+++ b/src/main/java/org/apache/sysml/hops/cost/CostEstimatorStaticRuntime.java
@@ -466,8 +466,7 @@ public class CostEstimatorStaticRuntime extends 
CostEstimator
        // Utilities       //
        /////////////////////   
        
-       private byte[] getInputIndexes(String[] inputVars)
-       {
+       private static byte[] getInputIndexes(String[] inputVars) {
                byte[] inIx = new byte[inputVars.length];
                for( int i=0; i<inIx.length; i++ )
                        inIx[i] = (byte)i;
@@ -542,7 +541,7 @@ public class CostEstimatorStaticRuntime extends 
CostEstimator
                return ret;
        }
        
-       private int computeNumMapTasks( VarStats[] vs, byte[] inputIx, double 
blocksize, int maxPMap, JobType jobtype )
+       private static int computeNumMapTasks( VarStats[] vs, byte[] inputIx, 
double blocksize, int maxPMap, JobType jobtype )
        {
                //special cases
                if( jobtype == JobType.DATAGEN )
@@ -565,7 +564,7 @@ public class CostEstimatorStaticRuntime extends 
CostEstimator
                return Math.max(1, Math.min( 
(int)Math.ceil(mapInputSize/blocksize),numBlocks ));
        }
        
-       private int computeNumReduceTasks( VarStats[] vs, byte[] mapOutIx, 
JobType jobtype )
+       private static int computeNumReduceTasks( VarStats[] vs, byte[] 
mapOutIx, JobType jobtype )
        {
                int ret = -1;
                
@@ -598,7 +597,7 @@ public class CostEstimatorStaticRuntime extends 
CostEstimator
                return Math.max(1, ret);
        }
 
-       private int getDistcacheIndex(String inst) 
+       private static int getDistcacheIndex(String inst) 
                throws DMLRuntimeException
        {
                ArrayList<Byte> indexes = new ArrayList<>();
@@ -629,7 +628,7 @@ public class CostEstimatorStaticRuntime extends 
CostEstimator
         * @param ds sparsity factor?
         * @return estimated HDFS read time
         */
-       private double getHDFSReadTime( long dm, long dn, double ds )
+       private static double getHDFSReadTime( long dm, long dn, double ds )
        {
                boolean sparse = MatrixBlock.evalSparseFormatOnDisk(dm, dn, 
(long)(ds*dm*dn));
                double ret = ((double)MatrixBlock.estimateSizeOnDisk((long)dm, 
(long)dn, (long)(ds*dm*dn))) / (1024*1024);              
@@ -642,7 +641,7 @@ public class CostEstimatorStaticRuntime extends 
CostEstimator
                return ret;
        }
        
-       private double getHDFSWriteTime( long dm, long dn, double ds )
+       private static double getHDFSWriteTime( long dm, long dn, double ds )
        {
                boolean sparse = MatrixBlock.evalSparseFormatOnDisk(dm, dn, 
(long)(ds*dm*dn));
                
@@ -662,7 +661,7 @@ public class CostEstimatorStaticRuntime extends 
CostEstimator
                return ret;
        }
        
-       private double getHDFSWriteTime( long dm, long dn, double ds, String 
format )
+       private static double getHDFSWriteTime( long dm, long dn, double ds, 
String format )
        {
                boolean sparse = MatrixBlock.evalSparseFormatOnDisk(dm, dn, 
(long)(ds*dm*dn));
                
@@ -702,7 +701,7 @@ public class CostEstimatorStaticRuntime extends 
CostEstimator
         * @param ds sparsity factor?
         * @return estimated local file system read time
         */
-       private double getFSReadTime( long dm, long dn, double ds )
+       private static double getFSReadTime( long dm, long dn, double ds )
        {
                boolean sparse = MatrixBlock.evalSparseFormatOnDisk(dm, dn, 
(long)(ds*dm*dn));
                
@@ -715,7 +714,7 @@ public class CostEstimatorStaticRuntime extends 
CostEstimator
                return ret;
        }
 
-       private double getFSWriteTime( long dm, long dn, double ds )
+       private static double getFSWriteTime( long dm, long dn, double ds )
        {
                boolean sparse = MatrixBlock.evalSparseFormatOnDisk(dm, dn, 
(long)(ds*dm*dn));
                
@@ -734,7 +733,7 @@ public class CostEstimatorStaticRuntime extends 
CostEstimator
        // Operation Costs //
        /////////////////////
        
-       private double getInstTimeEstimate(String opcode, VarStats[] vs, 
String[] args, ExecType et) 
+       private static double getInstTimeEstimate(String opcode, VarStats[] vs, 
String[] args, ExecType et) 
                throws DMLRuntimeException
        {
                boolean inMR = (et == ExecType.MR);
@@ -766,7 +765,7 @@ public class CostEstimatorStaticRuntime extends 
CostEstimator
         * @return estimated instruction execution time
         * @throws DMLRuntimeException if DMLRuntimeException occurs
         */
-       private double getInstTimeEstimate( String opcode, boolean inMR, long 
d1m, long d1n, double d1s, long d2m, long d2n, double d2s, long d3m, long d3n, 
double d3s, String[] args ) throws DMLRuntimeException
+       private static double getInstTimeEstimate( String opcode, boolean inMR, 
long d1m, long d1n, double d1s, long d2m, long d2n, double d2s, long d3m, long 
d3n, double d3s, String[] args ) throws DMLRuntimeException
        {
                double nflops = getNFLOP(opcode, inMR, d1m, d1n, d1s, d2m, d2n, 
d2s, d3m, d3n, d3s, args);
                double time = nflops / DEFAULT_FLOPS;
@@ -777,7 +776,7 @@ public class CostEstimatorStaticRuntime extends 
CostEstimator
                return time;
        }
        
-       private double getNFLOP( String optype, boolean inMR, long d1m, long 
d1n, double d1s, long d2m, long d2n, double d2s, long d3m, long d3n, double 
d3s, String[] args ) 
+       private static double getNFLOP( String optype, boolean inMR, long d1m, 
long d1n, double d1s, long d2m, long d2n, double d2s, long d3m, long d3n, 
double d3s, String[] args ) 
                throws DMLRuntimeException
        {
                //operation costs in FLOP on matrix block level (for CP and MR 
instructions)

http://git-wip-us.apache.org/repos/asf/systemml/blob/13a01758/src/main/java/org/apache/sysml/hops/ipa/IPAPassPropagateReplaceLiterals.java
----------------------------------------------------------------------
diff --git 
a/src/main/java/org/apache/sysml/hops/ipa/IPAPassPropagateReplaceLiterals.java 
b/src/main/java/org/apache/sysml/hops/ipa/IPAPassPropagateReplaceLiterals.java
index 57647ff..5e2e86c 100644
--- 
a/src/main/java/org/apache/sysml/hops/ipa/IPAPassPropagateReplaceLiterals.java
+++ 
b/src/main/java/org/apache/sysml/hops/ipa/IPAPassPropagateReplaceLiterals.java
@@ -120,7 +120,7 @@ public class IPAPassPropagateReplaceLiterals extends IPAPass
                }
        }
        
-       private void replaceLiterals(ArrayList<Hop> roots, LocalVariableMap 
constants) 
+       private static void replaceLiterals(ArrayList<Hop> roots, 
LocalVariableMap constants) 
                throws HopsException 
        {
                if( roots == null )
@@ -137,7 +137,7 @@ public class IPAPassPropagateReplaceLiterals extends IPAPass
                }
        }
        
-       private void replaceLiterals(Hop root, LocalVariableMap constants) 
+       private static void replaceLiterals(Hop root, LocalVariableMap 
constants) 
                throws HopsException 
        {
                if( root == null )

http://git-wip-us.apache.org/repos/asf/systemml/blob/13a01758/src/main/java/org/apache/sysml/hops/ipa/InterProceduralAnalysis.java
----------------------------------------------------------------------
diff --git 
a/src/main/java/org/apache/sysml/hops/ipa/InterProceduralAnalysis.java 
b/src/main/java/org/apache/sysml/hops/ipa/InterProceduralAnalysis.java
index 1aafe0b..65f7e54 100644
--- a/src/main/java/org/apache/sysml/hops/ipa/InterProceduralAnalysis.java
+++ b/src/main/java/org/apache/sysml/hops/ipa/InterProceduralAnalysis.java
@@ -380,7 +380,7 @@ public class InterProceduralAnalysis
         * @param vars  Map of variables eligible for propagation.
         * @throws HopsException  If a HopsException occurs.
         */
-       private void propagateScalarsAcrossDAG(ArrayList<Hop> roots, 
LocalVariableMap vars)
+       private static void propagateScalarsAcrossDAG(ArrayList<Hop> roots, 
LocalVariableMap vars)
                throws HopsException
        {
                for (Hop hop : roots) {
@@ -392,7 +392,7 @@ public class InterProceduralAnalysis
                }
        }
 
-       private void propagateStatisticsAcrossPredicateDAG( Hop root, 
LocalVariableMap vars ) 
+       private static void propagateStatisticsAcrossPredicateDAG( Hop root, 
LocalVariableMap vars ) 
                throws HopsException
        {
                if( root == null )
@@ -417,7 +417,7 @@ public class InterProceduralAnalysis
         * @param vars  Map of variables eligible for propagation.
         * @throws HopsException  If a HopsException occurs.
         */
-       private void propagateStatisticsAcrossDAG( ArrayList<Hop> roots, 
LocalVariableMap vars )
+       private static void propagateStatisticsAcrossDAG( ArrayList<Hop> roots, 
LocalVariableMap vars )
                throws HopsException
        {
                if( roots == null )
@@ -532,7 +532,7 @@ public class InterProceduralAnalysis
                hop.setVisited();
        }
        
-       private void populateLocalVariableMapForFunctionCall( FunctionStatement 
fstmt, FunctionOp fop, LocalVariableMap callvars, LocalVariableMap vars, 
FunctionCallSizeInfo fcallSizes ) 
+       private static void populateLocalVariableMapForFunctionCall( 
FunctionStatement fstmt, FunctionOp fop, LocalVariableMap callvars, 
LocalVariableMap vars, FunctionCallSizeInfo fcallSizes ) 
                throws HopsException
        {
                ArrayList<DataIdentifier> inputVars = fstmt.getInputParams();
@@ -592,7 +592,7 @@ public class InterProceduralAnalysis
         *                      calling program's variable map.
         * @throws HopsException  If a HopsException occurs.
         */
-       private void extractFunctionCallReturnStatistics( FunctionStatement 
fstmt, FunctionOp fop, LocalVariableMap tmpVars, LocalVariableMap callVars, 
boolean overwrite ) 
+       private static void extractFunctionCallReturnStatistics( 
FunctionStatement fstmt, FunctionOp fop, LocalVariableMap tmpVars, 
LocalVariableMap callVars, boolean overwrite ) 
                throws HopsException
        {
                ArrayList<DataIdentifier> foutputOps = fstmt.getOutputParams();
@@ -655,7 +655,7 @@ public class InterProceduralAnalysis
                }
        }
        
-       private void extractFunctionCallUnknownReturnStatistics( 
FunctionStatement fstmt, FunctionOp fop, LocalVariableMap callVars ) 
+       private static void extractFunctionCallUnknownReturnStatistics( 
FunctionStatement fstmt, FunctionOp fop, LocalVariableMap callVars ) 
                throws HopsException
        {
                ArrayList<DataIdentifier> foutputOps = fstmt.getOutputParams();
@@ -682,7 +682,7 @@ public class InterProceduralAnalysis
                }
        }
        
-       private void extractFunctionCallEquivalentReturnStatistics( 
FunctionStatement fstmt, FunctionOp fop, LocalVariableMap callVars ) 
+       private static void extractFunctionCallEquivalentReturnStatistics( 
FunctionStatement fstmt, FunctionOp fop, LocalVariableMap callVars ) 
                throws HopsException
        {
                try {
@@ -696,7 +696,7 @@ public class InterProceduralAnalysis
                }
        }
        
-       private void extractExternalFunctionCallReturnStatistics( 
ExternalFunctionStatement fstmt, FunctionOp fop, LocalVariableMap callVars ) 
+       private static void extractExternalFunctionCallReturnStatistics( 
ExternalFunctionStatement fstmt, FunctionOp fop, LocalVariableMap callVars ) 
                throws HopsException
        {
                String className = 
fstmt.getOtherParams().get(ExternalFunctionStatement.CLASS_NAME);
@@ -723,7 +723,7 @@ public class InterProceduralAnalysis
                }
        }
        
-       private MatrixObject createOutputMatrix( long dim1, long dim2, long nnz 
) {
+       private static MatrixObject createOutputMatrix( long dim1, long dim2, 
long nnz ) {
                MatrixObject moOut = new MatrixObject(ValueType.DOUBLE, null);
                MatrixCharacteristics mc = new MatrixCharacteristics( dim1, 
dim2,
                                ConfigurationManager.getBlocksize(), 
ConfigurationManager.getBlocksize(), nnz);

http://git-wip-us.apache.org/repos/asf/systemml/blob/13a01758/src/main/java/org/apache/sysml/hops/rewrite/RewriteAlgebraicSimplificationDynamic.java
----------------------------------------------------------------------
diff --git 
a/src/main/java/org/apache/sysml/hops/rewrite/RewriteAlgebraicSimplificationDynamic.java
 
b/src/main/java/org/apache/sysml/hops/rewrite/RewriteAlgebraicSimplificationDynamic.java
index dcb729e..5437535 100644
--- 
a/src/main/java/org/apache/sysml/hops/rewrite/RewriteAlgebraicSimplificationDynamic.java
+++ 
b/src/main/java/org/apache/sysml/hops/rewrite/RewriteAlgebraicSimplificationDynamic.java
@@ -205,7 +205,7 @@ public class RewriteAlgebraicSimplificationDynamic extends 
HopRewriteRule
                hop.setVisited();
        }
        
-       private Hop removeEmptyRightIndexing(Hop parent, Hop hi, int pos) 
+       private static Hop removeEmptyRightIndexing(Hop parent, Hop hi, int 
pos) 
                throws HopsException
        {
                if( hi instanceof IndexingOp && 
hi.getDataType()==DataType.MATRIX  ) //indexing op
@@ -228,7 +228,7 @@ public class RewriteAlgebraicSimplificationDynamic extends 
HopRewriteRule
                return hi;
        }
        
-       private Hop removeUnnecessaryRightIndexing(Hop parent, Hop hi, int pos)
+       private static Hop removeUnnecessaryRightIndexing(Hop parent, Hop hi, 
int pos)
        {
                if( hi instanceof IndexingOp ) //indexing op
                {
@@ -252,7 +252,7 @@ public class RewriteAlgebraicSimplificationDynamic extends 
HopRewriteRule
                return hi;
        }
        
-       private Hop removeEmptyLeftIndexing(Hop parent, Hop hi, int pos) 
+       private static Hop removeEmptyLeftIndexing(Hop parent, Hop hi, int pos) 
                throws HopsException
        {
                if( hi instanceof LeftIndexingOp && hi.getDataType() == 
DataType.MATRIX  ) //left indexing op
@@ -276,7 +276,7 @@ public class RewriteAlgebraicSimplificationDynamic extends 
HopRewriteRule
                return hi;
        }
        
-       private Hop removeUnnecessaryLeftIndexing(Hop parent, Hop hi, int pos)
+       private static Hop removeUnnecessaryLeftIndexing(Hop parent, Hop hi, 
int pos)
        {
                if( hi instanceof LeftIndexingOp  ) //left indexing op
                {
@@ -298,7 +298,7 @@ public class RewriteAlgebraicSimplificationDynamic extends 
HopRewriteRule
                return hi;
        }
        
-       private Hop fuseLeftIndexingChainToAppend(Hop parent, Hop hi, int pos)
+       private static Hop fuseLeftIndexingChainToAppend(Hop parent, Hop hi, 
int pos)
        {
                boolean applied = false;
                
@@ -359,7 +359,7 @@ public class RewriteAlgebraicSimplificationDynamic extends 
HopRewriteRule
                return hi;
        }
        
-       private Hop removeUnnecessaryCumulativeOp(Hop parent, Hop hi, int pos)
+       private static Hop removeUnnecessaryCumulativeOp(Hop parent, Hop hi, 
int pos)
        {
                if( hi instanceof UnaryOp && 
((UnaryOp)hi).isCumulativeUnaryOperation()  )
                {
@@ -381,7 +381,7 @@ public class RewriteAlgebraicSimplificationDynamic extends 
HopRewriteRule
                return hi;
        }
        
-       private Hop removeUnnecessaryReorgOperation(Hop parent, Hop hi, int pos)
+       private static Hop removeUnnecessaryReorgOperation(Hop parent, Hop hi, 
int pos)
        {
                if( hi instanceof ReorgOp ) 
                {
@@ -407,7 +407,7 @@ public class RewriteAlgebraicSimplificationDynamic extends 
HopRewriteRule
                return hi;
        }
        
-       private Hop removeUnnecessaryOuterProduct(Hop parent, Hop hi, int pos)
+       private static Hop removeUnnecessaryOuterProduct(Hop parent, Hop hi, 
int pos)
        {
                if( hi instanceof BinaryOp  ) //binary cell operation 
                {
@@ -457,7 +457,7 @@ public class RewriteAlgebraicSimplificationDynamic extends 
HopRewriteRule
        }
        
        @SuppressWarnings("unchecked")
-       private Hop fuseDatagenAndReorgOperation(Hop parent, Hop hi, int pos)
+       private static Hop fuseDatagenAndReorgOperation(Hop parent, Hop hi, int 
pos)
        {
                if( HopRewriteUtils.isTransposeOperation(hi)
                        && hi.getInput().get(0) instanceof DataGenOp            
           //datagen
@@ -495,7 +495,7 @@ public class RewriteAlgebraicSimplificationDynamic extends 
HopRewriteRule
        }
 
        @SuppressWarnings("unchecked")
-       private Hop simplifyColwiseAggregate( Hop parent, Hop hi, int pos ) 
+       private static Hop simplifyColwiseAggregate( Hop parent, Hop hi, int 
pos ) 
                throws HopsException
        {
                if( hi instanceof AggUnaryOp  ) 
@@ -559,7 +559,7 @@ public class RewriteAlgebraicSimplificationDynamic extends 
HopRewriteRule
        }
 
        @SuppressWarnings("unchecked")
-       private Hop simplifyRowwiseAggregate( Hop parent, Hop hi, int pos ) 
+       private static Hop simplifyRowwiseAggregate( Hop parent, Hop hi, int 
pos ) 
                throws HopsException
        {
                if( hi instanceof AggUnaryOp  ) 
@@ -625,7 +625,7 @@ public class RewriteAlgebraicSimplificationDynamic extends 
HopRewriteRule
                return hi;
        }
        
-       private Hop simplifyColSumsMVMult( Hop parent, Hop hi, int pos ) 
+       private static Hop simplifyColSumsMVMult( Hop parent, Hop hi, int pos ) 
                throws HopsException
        {
                //colSums(X*Y) -> t(Y) %*% X, if Y col vector; additional 
transpose later
@@ -661,7 +661,7 @@ public class RewriteAlgebraicSimplificationDynamic extends 
HopRewriteRule
                return hi;
        }
        
-       private Hop simplifyRowSumsMVMult( Hop parent, Hop hi, int pos ) 
+       private static Hop simplifyRowSumsMVMult( Hop parent, Hop hi, int pos ) 
                throws HopsException
        {
                //rowSums(X * Y) -> X %*% t(Y), if Y row vector; additional 
transpose later
@@ -697,7 +697,7 @@ public class RewriteAlgebraicSimplificationDynamic extends 
HopRewriteRule
                return hi;
        }
        
-       private Hop simplifyUnnecessaryAggregate(Hop parent, Hop hi, int pos) 
+       private static Hop simplifyUnnecessaryAggregate(Hop parent, Hop hi, int 
pos) 
                throws HopsException
        {
                //e.g., sum(X) -> as.scalar(X) if 1x1 (applies to sum, min, 
max, prod, trace)
@@ -724,7 +724,7 @@ public class RewriteAlgebraicSimplificationDynamic extends 
HopRewriteRule
                return hi;
        }
        
-       private Hop simplifyEmptyAggregate(Hop parent, Hop hi, int pos) 
+       private static Hop simplifyEmptyAggregate(Hop parent, Hop hi, int pos) 
                throws HopsException
        {
                if( hi instanceof AggUnaryOp  ) 
@@ -756,7 +756,7 @@ public class RewriteAlgebraicSimplificationDynamic extends 
HopRewriteRule
                return hi;
        }
        
-       private Hop simplifyEmptyUnaryOperation(Hop parent, Hop hi, int pos) 
+       private static Hop simplifyEmptyUnaryOperation(Hop parent, Hop hi, int 
pos) 
                throws HopsException
        {
                if( hi instanceof UnaryOp  ) 
@@ -781,7 +781,7 @@ public class RewriteAlgebraicSimplificationDynamic extends 
HopRewriteRule
                return hi;
        }
        
-       private Hop simplifyEmptyReorgOperation(Hop parent, Hop hi, int pos) 
+       private static Hop simplifyEmptyReorgOperation(Hop parent, Hop hi, int 
pos) 
                throws HopsException
        {
                if( hi instanceof ReorgOp  ) 
@@ -823,7 +823,7 @@ public class RewriteAlgebraicSimplificationDynamic extends 
HopRewriteRule
                return hi;
        }
        
-       private Hop simplifyEmptySortOperation(Hop parent, Hop hi, int pos) 
+       private static Hop simplifyEmptySortOperation(Hop parent, Hop hi, int 
pos) 
                throws HopsException
        {
                //order(X, indexreturn=FALSE) -> matrix(0,nrow(X),1)
@@ -862,7 +862,7 @@ public class RewriteAlgebraicSimplificationDynamic extends 
HopRewriteRule
                return hi;
        }
        
-       private Hop simplifyEmptyMatrixMult(Hop parent, Hop hi, int pos) 
+       private static Hop simplifyEmptyMatrixMult(Hop parent, Hop hi, int pos) 
                throws HopsException
        {
                if( HopRewriteUtils.isMatrixMultiply(hi) ) //X%*%Y -> matrix(0, 
)
@@ -885,7 +885,7 @@ public class RewriteAlgebraicSimplificationDynamic extends 
HopRewriteRule
                return hi;
        }
        
-       private Hop simplifyIdentityRepMatrixMult(Hop parent, Hop hi, int pos) 
+       private static Hop simplifyIdentityRepMatrixMult(Hop parent, Hop hi, 
int pos) 
                throws HopsException
        {
                if( HopRewriteUtils.isMatrixMultiply(hi) ) //X%*%Y -> X, if y 
is matrix(1,1,1)
@@ -908,7 +908,7 @@ public class RewriteAlgebraicSimplificationDynamic extends 
HopRewriteRule
                return hi;
        }
        
-       private Hop simplifyScalarMatrixMult(Hop parent, Hop hi, int pos) 
+       private static Hop simplifyScalarMatrixMult(Hop parent, Hop hi, int 
pos) 
                throws HopsException
        {
                if( HopRewriteUtils.isMatrixMultiply(hi) ) //X%*%Y
@@ -947,7 +947,7 @@ public class RewriteAlgebraicSimplificationDynamic extends 
HopRewriteRule
                return hi;
        }
        
-       private Hop simplifyMatrixMultDiag(Hop parent, Hop hi, int pos) 
+       private static Hop simplifyMatrixMultDiag(Hop parent, Hop hi, int pos) 
                throws HopsException
        {
                Hop hnew = null;
@@ -1002,7 +1002,7 @@ public class RewriteAlgebraicSimplificationDynamic 
extends HopRewriteRule
                return hi;
        }
        
-       private Hop simplifyDiagMatrixMult(Hop parent, Hop hi, int pos)
+       private static Hop simplifyDiagMatrixMult(Hop parent, Hop hi, int pos)
        {
                if( hi instanceof ReorgOp && 
((ReorgOp)hi).getOp()==ReOrgOp.DIAG && hi.getDim2()==1 ) //diagM2V
                {
@@ -1029,7 +1029,7 @@ public class RewriteAlgebraicSimplificationDynamic 
extends HopRewriteRule
                return hi;
        }
        
-       private Hop simplifySumDiagToTrace(Hop hi)
+       private static Hop simplifySumDiagToTrace(Hop hi)
        {
                if( hi instanceof AggUnaryOp ) 
                {
@@ -1058,7 +1058,7 @@ public class RewriteAlgebraicSimplificationDynamic 
extends HopRewriteRule
        }
        
        @SuppressWarnings("unchecked")
-       private Hop pushdownBinaryOperationOnDiag(Hop parent, Hop hi, int pos) 
+       private static Hop pushdownBinaryOperationOnDiag(Hop parent, Hop hi, 
int pos) 
        {
                //diag(X)*7 --> diag(X*7) in order to (1) reduce required 
memory for b(*) and
                //(2) in order to make the binary operation more efficient 
(dense vector vs sparse matrix)
@@ -1141,7 +1141,7 @@ public class RewriteAlgebraicSimplificationDynamic 
extends HopRewriteRule
         * @param pos position
         * @return high-level operator
         */
-       private Hop pushdownSumOnAdditiveBinary(Hop parent, Hop hi, int pos) 
+       private static Hop pushdownSumOnAdditiveBinary(Hop parent, Hop hi, int 
pos) 
        {
                //all patterns headed by full sum over binary operation
                if(    hi instanceof AggUnaryOp //full sum root over binaryop
@@ -1204,7 +1204,7 @@ public class RewriteAlgebraicSimplificationDynamic 
extends HopRewriteRule
         * @return high-level operator
         * @throws HopsException if HopsException occurs
         */
-       private Hop simplifyWeightedSquaredLoss(Hop parent, Hop hi, int pos) 
+       private static Hop simplifyWeightedSquaredLoss(Hop parent, Hop hi, int 
pos) 
                throws HopsException
        {
                //NOTE: there might be also a general simplification without 
custom operator
@@ -1392,7 +1392,7 @@ public class RewriteAlgebraicSimplificationDynamic 
extends HopRewriteRule
                return hi;
        }
        
-       private Hop simplifyWeightedSigmoidMMChains(Hop parent, Hop hi, int 
pos) 
+       private static Hop simplifyWeightedSigmoidMMChains(Hop parent, Hop hi, 
int pos) 
                throws HopsException
        {
                Hop hnew = null;
@@ -1528,7 +1528,7 @@ public class RewriteAlgebraicSimplificationDynamic 
extends HopRewriteRule
                return hi;
        }
 
-       private Hop simplifyWeightedDivMM(Hop parent, Hop hi, int pos) 
+       private static Hop simplifyWeightedDivMM(Hop parent, Hop hi, int pos) 
                throws HopsException
        {
                Hop hnew = null;
@@ -1846,7 +1846,7 @@ public class RewriteAlgebraicSimplificationDynamic 
extends HopRewriteRule
                return hi;
        }
 
-       private Hop simplifyWeightedCrossEntropy(Hop parent, Hop hi, int pos) 
+       private static Hop simplifyWeightedCrossEntropy(Hop parent, Hop hi, int 
pos) 
                throws HopsException
        {
                Hop hnew = null;
@@ -1923,7 +1923,7 @@ public class RewriteAlgebraicSimplificationDynamic 
extends HopRewriteRule
                return hi;
        }
        
-       private Hop simplifyWeightedUnaryMM(Hop parent, Hop hi, int pos) 
+       private static Hop simplifyWeightedUnaryMM(Hop parent, Hop hi, int pos) 
                throws HopsException
        {
                Hop hnew = null;
@@ -2077,7 +2077,7 @@ public class RewriteAlgebraicSimplificationDynamic 
extends HopRewriteRule
         * @return high-level operator
         * @throws HopsException if HopsException occurs
         */
-       private Hop simplifyDotProductSum(Hop parent, Hop hi, int pos) 
+       private static Hop simplifyDotProductSum(Hop parent, Hop hi, int pos) 
                throws HopsException
        {
                //sum(v^2)/sum(v1*v2) --> as.scalar(t(v)%*%v) in order to 
exploit tsmm vector dotproduct 
@@ -2151,7 +2151,7 @@ public class RewriteAlgebraicSimplificationDynamic 
extends HopRewriteRule
         *
         * @throws HopsException if HopsException occurs
         */
-       private Hop fuseSumSquared(Hop parent, Hop hi, int pos)
+       private static Hop fuseSumSquared(Hop parent, Hop hi, int pos)
                        throws HopsException {
                // if SUM
                if (hi instanceof AggUnaryOp && ((AggUnaryOp) hi).getOp() == 
AggOp.SUM) {
@@ -2180,7 +2180,7 @@ public class RewriteAlgebraicSimplificationDynamic 
extends HopRewriteRule
                return hi;
        }
        
-       private Hop fuseAxpyBinaryOperationChain(Hop parent, Hop hi, int pos) 
+       private static Hop fuseAxpyBinaryOperationChain(Hop parent, Hop hi, int 
pos) 
        {
                //patterns: (a) X + s*Y -> X +* sY, (b) s*Y+X -> X +* sY, (c) X 
- s*Y -> X -* sY                
                if( hi instanceof BinaryOp && !((BinaryOp) 
hi).isOuterVectorOperator()
@@ -2236,7 +2236,7 @@ public class RewriteAlgebraicSimplificationDynamic 
extends HopRewriteRule
                return hi;
        }
        
-       private Hop simplifyEmptyBinaryOperation(Hop parent, Hop hi, int pos) 
+       private static Hop simplifyEmptyBinaryOperation(Hop parent, Hop hi, int 
pos) 
                throws HopsException
        {
                if( hi instanceof BinaryOp ) //b(?) X Y
@@ -2320,7 +2320,7 @@ public class RewriteAlgebraicSimplificationDynamic 
extends HopRewriteRule
         * @throws HopsException if HopsException occurs
         */
        @SuppressWarnings("unchecked")
-       private Hop reorderMinusMatrixMult(Hop parent, Hop hi, int pos) 
+       private static Hop reorderMinusMatrixMult(Hop parent, Hop hi, int pos) 
                throws HopsException
        {
                if( HopRewriteUtils.isMatrixMultiply(hi) ) //X%*%Y
@@ -2402,7 +2402,7 @@ public class RewriteAlgebraicSimplificationDynamic 
extends HopRewriteRule
        }
 
 
-       private Hop simplifySumMatrixMult(Hop parent, Hop hi, int pos)
+       private static Hop simplifySumMatrixMult(Hop parent, Hop hi, int pos)
        {
                //sum(A%*%B) -> sum(t(colSums(A))*rowSums(B)), later rewritten 
to dot-product
                //colSums(A%*%B) -> colSums(A)%*%B
@@ -2455,7 +2455,7 @@ public class RewriteAlgebraicSimplificationDynamic 
extends HopRewriteRule
                return hi;
        }
        
-       private Hop simplifyScalarMVBinaryOperation(Hop hi) 
+       private static Hop simplifyScalarMVBinaryOperation(Hop hi) 
                throws HopsException
        {
                if( hi instanceof BinaryOp && 
((BinaryOp)hi).supportsMatrixScalarOperations() //e.g., X * s
@@ -2478,7 +2478,7 @@ public class RewriteAlgebraicSimplificationDynamic 
extends HopRewriteRule
                return hi;
        }
        
-       private Hop simplifyNnzComputation(Hop parent, Hop hi, int pos) 
+       private static Hop simplifyNnzComputation(Hop parent, Hop hi, int pos) 
                throws HopsException
        {
                //sum(ppred(X,0,"!=")) -> literal(nnz(X)), if nnz known         
@@ -2513,7 +2513,7 @@ public class RewriteAlgebraicSimplificationDynamic 
extends HopRewriteRule
                return hi;
        }
        
-       private Hop simplifyNrowNcolComputation(Hop parent, Hop hi, int pos) 
+       private static Hop simplifyNrowNcolComputation(Hop parent, Hop hi, int 
pos) 
                throws HopsException
        {
                //nrow(X) -> literal(nrow(X)), ncol(X) -> literal(ncol(X)), if 
respective dims known
@@ -2542,7 +2542,7 @@ public class RewriteAlgebraicSimplificationDynamic 
extends HopRewriteRule
                return hi;
        }
        
-       private Hop simplifyTableSeqExpand(Hop parent, Hop hi, int pos) 
+       private static Hop simplifyTableSeqExpand(Hop parent, Hop hi, int pos) 
                throws HopsException
        {
                //pattern: table(seq(1,nrow(v)), v, nrow(v), m) -> rexpand(v, 
max=m, dir=row, ignore=false, cast=true)

http://git-wip-us.apache.org/repos/asf/systemml/blob/13a01758/src/main/java/org/apache/sysml/hops/rewrite/RewriteAlgebraicSimplificationStatic.java
----------------------------------------------------------------------
diff --git 
a/src/main/java/org/apache/sysml/hops/rewrite/RewriteAlgebraicSimplificationStatic.java
 
b/src/main/java/org/apache/sysml/hops/rewrite/RewriteAlgebraicSimplificationStatic.java
index 4e5f3fb..64a37d7 100644
--- 
a/src/main/java/org/apache/sysml/hops/rewrite/RewriteAlgebraicSimplificationStatic.java
+++ 
b/src/main/java/org/apache/sysml/hops/rewrite/RewriteAlgebraicSimplificationStatic.java
@@ -188,7 +188,7 @@ public class RewriteAlgebraicSimplificationStatic extends 
HopRewriteRule
                hop.setVisited();
        }
        
-       private Hop removeUnnecessaryVectorizeOperation(Hop hi)
+       private static Hop removeUnnecessaryVectorizeOperation(Hop hi)
        {
                //applies to all binary matrix operations, if one input is 
unnecessarily vectorized 
                if(    hi instanceof BinaryOp && 
hi.getDataType()==DataType.MATRIX 
@@ -256,7 +256,7 @@ public class RewriteAlgebraicSimplificationStatic extends 
HopRewriteRule
         * @return high-level operator
         * @throws HopsException if HopsException occurs
         */
-       private Hop removeUnnecessaryBinaryOperation( Hop parent, Hop hi, int 
pos ) 
+       private static Hop removeUnnecessaryBinaryOperation( Hop parent, Hop 
hi, int pos ) 
                throws HopsException
        {
                if( hi instanceof BinaryOp )
@@ -345,7 +345,7 @@ public class RewriteAlgebraicSimplificationStatic extends 
HopRewriteRule
         * @throws HopsException if HopsException occurs
         */
        @SuppressWarnings("incomplete-switch")
-       private Hop fuseDatagenAndBinaryOperation( Hop hi ) 
+       private static Hop fuseDatagenAndBinaryOperation( Hop hi ) 
                throws HopsException
        {
                if( hi instanceof BinaryOp )
@@ -428,7 +428,7 @@ public class RewriteAlgebraicSimplificationStatic extends 
HopRewriteRule
                return hi;
        }
        
-       private Hop fuseDatagenAndMinusOperation( Hop hi ) 
+       private static Hop fuseDatagenAndMinusOperation( Hop hi ) 
                throws HopsException
        {
                if( hi instanceof BinaryOp )
@@ -490,7 +490,7 @@ public class RewriteAlgebraicSimplificationStatic extends 
HopRewriteRule
         * @return high-level operator
         * @throws HopsException if HopsException occurs
         */
-       private Hop simplifyBinaryToUnaryOperation( Hop parent, Hop hi, int pos 
) 
+       private static Hop simplifyBinaryToUnaryOperation( Hop parent, Hop hi, 
int pos ) 
                throws HopsException
        {
                if( hi instanceof BinaryOp )
@@ -550,7 +550,7 @@ public class RewriteAlgebraicSimplificationStatic extends 
HopRewriteRule
         * @return high-level operator
         * @throws HopsException if HopsException occurs
         */
-       private Hop canonicalizeMatrixMultScalarAdd( Hop hi ) 
+       private static Hop canonicalizeMatrixMultScalarAdd( Hop hi ) 
                throws HopsException
        {
                //pattern: binary operation (+ or -) of matrix mult and scalar 
@@ -594,7 +594,7 @@ public class RewriteAlgebraicSimplificationStatic extends 
HopRewriteRule
         * @return high-level operator
         * @throws HopsException if HopsException occurs
         */
-       private Hop simplifyReverseOperation( Hop parent, Hop hi, int pos ) 
+       private static Hop simplifyReverseOperation( Hop parent, Hop hi, int 
pos ) 
                throws HopsException
        {
                if(    hi instanceof AggBinaryOp 
@@ -619,7 +619,7 @@ public class RewriteAlgebraicSimplificationStatic extends 
HopRewriteRule
                return hi;
        }
        
-       private Hop simplifyMultiBinaryToBinaryOperation( Hop hi )
+       private static Hop simplifyMultiBinaryToBinaryOperation( Hop hi )
        {
                //pattern: 1-(X*Y) --> X 1-* Y (avoid intermediate)
                if( HopRewriteUtils.isBinary(hi, OpOp2.MINUS)
@@ -655,7 +655,7 @@ public class RewriteAlgebraicSimplificationStatic extends 
HopRewriteRule
         * @param pos position
         * @return high-level operator
         */
-       private Hop simplifyDistributiveBinaryOperation( Hop parent, Hop hi, 
int pos )
+       private static Hop simplifyDistributiveBinaryOperation( Hop parent, Hop 
hi, int pos )
        {
                
                if( hi instanceof BinaryOp )
@@ -733,7 +733,7 @@ public class RewriteAlgebraicSimplificationStatic extends 
HopRewriteRule
         * @param pos position
         * @return high-level operator
         */
-       private Hop simplifyBushyBinaryOperation( Hop parent, Hop hi, int pos )
+       private static Hop simplifyBushyBinaryOperation( Hop parent, Hop hi, 
int pos )
        {
                if( hi instanceof BinaryOp && parent instanceof AggBinaryOp )
                {
@@ -799,7 +799,7 @@ public class RewriteAlgebraicSimplificationStatic extends 
HopRewriteRule
                return hi;
        }
        
-       private Hop simplifyUnaryAggReorgOperation( Hop parent, Hop hi, int pos 
)
+       private static Hop simplifyUnaryAggReorgOperation( Hop parent, Hop hi, 
int pos )
        {
                if(   hi instanceof AggUnaryOp && 
((AggUnaryOp)hi).getDirection()==Direction.RowCol  //full uagg
                   && hi.getInput().get(0) instanceof ReorgOp  ) //reorg 
operation
@@ -821,7 +821,7 @@ public class RewriteAlgebraicSimplificationStatic extends 
HopRewriteRule
                return hi;
        }
        
-       private Hop removeUnnecessaryAggregates(Hop hi)
+       private static Hop removeUnnecessaryAggregates(Hop hi)
        {
                //sum(rowSums(X)) -> sum(X), sum(colSums(X)) -> sum(X)
                //min(rowMins(X)) -> min(X), min(colMins(X)) -> min(X)
@@ -850,7 +850,7 @@ public class RewriteAlgebraicSimplificationStatic extends 
HopRewriteRule
                return hi;
        }
        
-       private Hop simplifyBinaryMatrixScalarOperation( Hop parent, Hop hi, 
int pos ) 
+       private static Hop simplifyBinaryMatrixScalarOperation( Hop parent, Hop 
hi, int pos ) 
                throws HopsException
        {
                // Note: This rewrite is not applicable for all binary 
operations because some of them 
@@ -892,7 +892,7 @@ public class RewriteAlgebraicSimplificationStatic extends 
HopRewriteRule
                return hi;
        }
        
-       private Hop pushdownUnaryAggTransposeOperation( Hop parent, Hop hi, int 
pos )
+       private static Hop pushdownUnaryAggTransposeOperation( Hop parent, Hop 
hi, int pos )
        {
                if( hi instanceof AggUnaryOp && hi.getParent().size()==1 
                        && (((AggUnaryOp) hi).getDirection()==Direction.Row || 
((AggUnaryOp) hi).getDirection()==Direction.Col) 
@@ -929,7 +929,7 @@ public class RewriteAlgebraicSimplificationStatic extends 
HopRewriteRule
                return hi;
        }
        
-       private Hop pushdownCSETransposeScalarOperation( Hop parent, Hop hi, 
int pos )
+       private static Hop pushdownCSETransposeScalarOperation( Hop parent, Hop 
hi, int pos )
        {
                // a=t(X), b=t(X^2) -> a=t(X), b=t(X)^2 for CSE t(X)
                // probed at root node of b in above example
@@ -964,7 +964,7 @@ public class RewriteAlgebraicSimplificationStatic extends 
HopRewriteRule
                return hi;
        }
 
-       private Hop pushdownSumBinaryMult(Hop parent, Hop hi, int pos ) throws 
HopsException {
+       private static Hop pushdownSumBinaryMult(Hop parent, Hop hi, int pos ) 
throws HopsException {
                //pattern:  sum(lamda*X) -> lamda*sum(X)
                if( hi instanceof AggUnaryOp && 
((AggUnaryOp)hi).getDirection()==Direction.RowCol
                                && ((AggUnaryOp)hi).getOp()==Hop.AggOp.SUM // 
only one parent which is the sum
@@ -990,7 +990,7 @@ public class RewriteAlgebraicSimplificationStatic extends 
HopRewriteRule
                return hi;
        }
 
-       private Hop simplifyUnaryPPredOperation( Hop parent, Hop hi, int pos )
+       private static Hop simplifyUnaryPPredOperation( Hop parent, Hop hi, int 
pos )
        {
                if( hi instanceof UnaryOp && hi.getDataType()==DataType.MATRIX  
//unaryop
                        && hi.getInput().get(0) instanceof BinaryOp             
    //binaryop - ppred
@@ -1014,7 +1014,7 @@ public class RewriteAlgebraicSimplificationStatic extends 
HopRewriteRule
                return hi;
        }
        
-       private Hop simplifyTransposedAppend( Hop parent, Hop hi, int pos )
+       private static Hop simplifyTransposedAppend( Hop parent, Hop hi, int 
pos )
        {
                //e.g., t(cbind(t(A),t(B))) --> rbind(A,B), t(rbind(t(A),t(B))) 
--> cbind(A,B)          
                if(   HopRewriteUtils.isTransposeOperation(hi)  //t() rooted
@@ -1057,7 +1057,7 @@ public class RewriteAlgebraicSimplificationStatic extends 
HopRewriteRule
         * @param pos position
         * @throws HopsException if HopsException occurs
         */
-       private Hop fuseBinarySubDAGToUnaryOperation( Hop parent, Hop hi, int 
pos ) 
+       private static Hop fuseBinarySubDAGToUnaryOperation( Hop parent, Hop 
hi, int pos ) 
                throws HopsException
        {
                if( hi instanceof BinaryOp )
@@ -1241,7 +1241,7 @@ public class RewriteAlgebraicSimplificationStatic extends 
HopRewriteRule
                return hi;
        }
 
-       private Hop simplifyTraceMatrixMult(Hop parent, Hop hi, int pos)
+       private static Hop simplifyTraceMatrixMult(Hop parent, Hop hi, int pos)
        {
                if( hi instanceof AggUnaryOp && 
((AggUnaryOp)hi).getOp()==AggOp.TRACE ) //trace()
                {
@@ -1268,7 +1268,7 @@ public class RewriteAlgebraicSimplificationStatic extends 
HopRewriteRule
                return hi;
        }
        
-       private Hop simplifySlicedMatrixMult(Hop parent, Hop hi, int pos) 
+       private static Hop simplifySlicedMatrixMult(Hop parent, Hop hi, int 
pos) 
                throws HopsException
        {
                //e.g., (X%*%Y)[1,1] -> X[1,] %*% Y[,1] 
@@ -1309,7 +1309,7 @@ public class RewriteAlgebraicSimplificationStatic extends 
HopRewriteRule
                return hi;
        }
 
-       private Hop simplifyConstantSort(Hop parent, Hop hi, int pos) 
+       private static Hop simplifyConstantSort(Hop parent, Hop hi, int pos) 
                throws HopsException
        {
                //order(matrix(7), indexreturn=FALSE) -> matrix(7)
@@ -1348,7 +1348,7 @@ public class RewriteAlgebraicSimplificationStatic extends 
HopRewriteRule
                return hi;
        }
        
-       private Hop simplifyOrderedSort(Hop parent, Hop hi, int pos) 
+       private static Hop simplifyOrderedSort(Hop parent, Hop hi, int pos) 
                throws HopsException
        {
                //order(seq(2,N+1,1), indexreturn=FALSE) -> matrix(7)
@@ -1402,7 +1402,7 @@ public class RewriteAlgebraicSimplificationStatic extends 
HopRewriteRule
         * @return high-level operator
         * @throws HopsException if HopsException occurs
         */
-       private Hop simplifyTransposeAggBinBinaryChains(Hop parent, Hop hi, int 
pos) 
+       private static Hop simplifyTransposeAggBinBinaryChains(Hop parent, Hop 
hi, int pos) 
                throws HopsException
        {
                if( HopRewriteUtils.isTransposeOperation(hi)
@@ -1444,7 +1444,7 @@ public class RewriteAlgebraicSimplificationStatic extends 
HopRewriteRule
         * @param pos position
         * @return high-level operator
         */
-       private Hop removeUnnecessaryReorgOperation(Hop parent, Hop hi, int pos)
+       private static Hop removeUnnecessaryReorgOperation(Hop parent, Hop hi, 
int pos)
        {
                ReOrgOp[] lookup = new ReOrgOp[]{ReOrgOp.TRANSPOSE, 
ReOrgOp.REV};
                
@@ -1467,7 +1467,7 @@ public class RewriteAlgebraicSimplificationStatic extends 
HopRewriteRule
                return hi;
        }
 
-       private Hop removeUnnecessaryMinus(Hop parent, Hop hi, int pos) 
+       private static Hop removeUnnecessaryMinus(Hop parent, Hop hi, int pos) 
                throws HopsException
        {
                if( hi.getDataType() == DataType.MATRIX && hi instanceof 
BinaryOp 
@@ -1493,7 +1493,7 @@ public class RewriteAlgebraicSimplificationStatic extends 
HopRewriteRule
                return hi;
        }
 
-       private Hop simplifyGroupedAggregate(Hop hi)
+       private static Hop simplifyGroupedAggregate(Hop hi)
        {
                if( hi instanceof ParameterizedBuiltinOp && 
((ParameterizedBuiltinOp)hi).getOp()==ParamBuiltinOp.GROUPEDAGG  ) //aggregate
                {
@@ -1522,7 +1522,7 @@ public class RewriteAlgebraicSimplificationStatic extends 
HopRewriteRule
                return hi;
        }
        
-       private Hop fuseMinusNzBinaryOperation(Hop parent, Hop hi, int pos) 
+       private static Hop fuseMinusNzBinaryOperation(Hop parent, Hop hi, int 
pos) 
                throws HopsException
        {
                //pattern X - (s * ppred(X,0,!=)) -> X -nz s
@@ -1556,7 +1556,7 @@ public class RewriteAlgebraicSimplificationStatic extends 
HopRewriteRule
                return hi;
        }
        
-       private Hop fuseLogNzUnaryOperation(Hop parent, Hop hi, int pos) 
+       private static Hop fuseLogNzUnaryOperation(Hop parent, Hop hi, int pos) 
                throws HopsException
        {
                //pattern ppred(X,0,"!=")*log(X) -> log_nz(X)
@@ -1588,7 +1588,7 @@ public class RewriteAlgebraicSimplificationStatic extends 
HopRewriteRule
                return hi;
        }
 
-       private Hop fuseLogNzBinaryOperation(Hop parent, Hop hi, int pos) 
+       private static Hop fuseLogNzBinaryOperation(Hop parent, Hop hi, int 
pos) 
                throws HopsException
        {
                //pattern ppred(X,0,"!=")*log(X,0.5) -> log_nz(X,0.5)
@@ -1621,7 +1621,7 @@ public class RewriteAlgebraicSimplificationStatic extends 
HopRewriteRule
                return hi;
        }
 
-       private Hop simplifyOuterSeqExpand(Hop parent, Hop hi, int pos) 
+       private static Hop simplifyOuterSeqExpand(Hop parent, Hop hi, int pos) 
                throws HopsException
        {
                //pattern: outer(v, t(seq(1,m)), "==") -> rexpand(v, max=m, 
dir=row, ignore=true, cast=false)
@@ -1678,7 +1678,7 @@ public class RewriteAlgebraicSimplificationStatic extends 
HopRewriteRule
         * @throws HopsException if HopsException occurs
         */
        @SuppressWarnings("unused")
-       private Hop removeUnecessaryPPred(Hop parent, Hop hi, int pos) 
+       private static Hop removeUnecessaryPPred(Hop parent, Hop hi, int pos) 
                throws HopsException
        {
                if( hi instanceof BinaryOp )

http://git-wip-us.apache.org/repos/asf/systemml/blob/13a01758/src/main/java/org/apache/sysml/hops/rewrite/RewriteConstantFolding.java
----------------------------------------------------------------------
diff --git 
a/src/main/java/org/apache/sysml/hops/rewrite/RewriteConstantFolding.java 
b/src/main/java/org/apache/sysml/hops/rewrite/RewriteConstantFolding.java
index 92b91e0..2d94259 100644
--- a/src/main/java/org/apache/sysml/hops/rewrite/RewriteConstantFolding.java
+++ b/src/main/java/org/apache/sysml/hops/rewrite/RewriteConstantFolding.java
@@ -243,7 +243,7 @@ public class RewriteConstantFolding extends HopRewriteRule
                return _tmpEC;
        }
        
-       private boolean isApplicableBinaryOp( Hop hop )
+       private static boolean isApplicableBinaryOp( Hop hop )
        {
                ArrayList<Hop> in = hop.getInput();
                return (   hop instanceof BinaryOp 
@@ -256,8 +256,7 @@ public class RewriteConstantFolding extends HopRewriteRule
                //messes up the explain runtime output due to introduced \n 
        }
        
-       private boolean isApplicableUnaryOp( Hop hop )
-       {
+       private static boolean isApplicableUnaryOp( Hop hop ) {
                ArrayList<Hop> in = hop.getInput();
                return (   hop instanceof UnaryOp 
                                && in.get(0) instanceof LiteralOp 
@@ -266,21 +265,17 @@ public class RewriteConstantFolding extends HopRewriteRule
                                && hop.getDataType() == DataType.SCALAR);
        }
        
-       private boolean isApplicableFalseConjunctivePredicate( Hop hop ) 
-               throws HopsException
-       {
+       private static boolean isApplicableFalseConjunctivePredicate( Hop hop ) 
throws HopsException {
                ArrayList<Hop> in = hop.getInput();
                return (   HopRewriteUtils.isBinary(hop, OpOp2.AND)
-                               && ( (in.get(0) instanceof LiteralOp && 
!((LiteralOp)in.get(0)).getBooleanValue())   
-                                  ||(in.get(1) instanceof LiteralOp && 
!((LiteralOp)in.get(1)).getBooleanValue())) );                  
+                               && ( (in.get(0) instanceof LiteralOp && 
!((LiteralOp)in.get(0)).getBooleanValue())
+                                  ||(in.get(1) instanceof LiteralOp && 
!((LiteralOp)in.get(1)).getBooleanValue())) );
        }
        
-       private boolean isApplicableTrueDisjunctivePredicate( Hop hop ) 
-               throws HopsException
-       {
+       private static boolean isApplicableTrueDisjunctivePredicate( Hop hop ) 
throws HopsException {
                ArrayList<Hop> in = hop.getInput();
                return (   HopRewriteUtils.isBinary(hop, OpOp2.OR)
-                               && ( (in.get(0) instanceof LiteralOp && 
((LiteralOp)in.get(0)).getBooleanValue())   
-                                  ||(in.get(1) instanceof LiteralOp && 
((LiteralOp)in.get(1)).getBooleanValue())) );                   
+                               && ( (in.get(0) instanceof LiteralOp && 
((LiteralOp)in.get(0)).getBooleanValue())
+                                  ||(in.get(1) instanceof LiteralOp && 
((LiteralOp)in.get(1)).getBooleanValue())) );
        }
 }

http://git-wip-us.apache.org/repos/asf/systemml/blob/13a01758/src/main/java/org/apache/sysml/hops/rewrite/RewriteForLoopVectorization.java
----------------------------------------------------------------------
diff --git 
a/src/main/java/org/apache/sysml/hops/rewrite/RewriteForLoopVectorization.java 
b/src/main/java/org/apache/sysml/hops/rewrite/RewriteForLoopVectorization.java
index fdcf96b..7d01715 100644
--- 
a/src/main/java/org/apache/sysml/hops/rewrite/RewriteForLoopVectorization.java
+++ 
b/src/main/java/org/apache/sysml/hops/rewrite/RewriteForLoopVectorization.java
@@ -103,7 +103,7 @@ public class RewriteForLoopVectorization extends 
StatementBlockRewriteRule
                return sbs;
        }
        
-       private StatementBlock vectorizeScalarAggregate( StatementBlock sb, 
StatementBlock csb, Hop from, Hop to, Hop increment, String itervar ) 
+       private static StatementBlock vectorizeScalarAggregate( StatementBlock 
sb, StatementBlock csb, Hop from, Hop to, Hop increment, String itervar ) 
                throws HopsException
        {
                StatementBlock ret = sb;
@@ -205,7 +205,7 @@ public class RewriteForLoopVectorization extends 
StatementBlockRewriteRule
                return ret;
        }
        
-       private StatementBlock vectorizeElementwiseBinary( StatementBlock sb, 
StatementBlock csb, Hop from, Hop to, Hop increment, String itervar ) 
+       private static StatementBlock vectorizeElementwiseBinary( 
StatementBlock sb, StatementBlock csb, Hop from, Hop to, Hop increment, String 
itervar ) 
                throws HopsException
        {
                StatementBlock ret = sb;
@@ -289,7 +289,7 @@ public class RewriteForLoopVectorization extends 
StatementBlockRewriteRule
                return ret;
        }
        
-       private StatementBlock vectorizeElementwiseUnary( StatementBlock sb, 
StatementBlock csb, Hop from, Hop to, Hop increment, String itervar )
+       private static StatementBlock vectorizeElementwiseUnary( StatementBlock 
sb, StatementBlock csb, Hop from, Hop to, Hop increment, String itervar )
                throws HopsException
        {
                StatementBlock ret = sb;
@@ -349,7 +349,7 @@ public class RewriteForLoopVectorization extends 
StatementBlockRewriteRule
                return ret;
        }
        
-       private StatementBlock vectorizeIndexedCopy( StatementBlock sb, 
StatementBlock csb, Hop from, Hop to, Hop increment, String itervar )
+       private static StatementBlock vectorizeIndexedCopy( StatementBlock sb, 
StatementBlock csb, Hop from, Hop to, Hop increment, String itervar )
                throws HopsException
        {
                StatementBlock ret = sb;

http://git-wip-us.apache.org/repos/asf/systemml/blob/13a01758/src/main/java/org/apache/sysml/hops/rewrite/RewriteIndexingVectorization.java
----------------------------------------------------------------------
diff --git 
a/src/main/java/org/apache/sysml/hops/rewrite/RewriteIndexingVectorization.java 
b/src/main/java/org/apache/sysml/hops/rewrite/RewriteIndexingVectorization.java
index bd22522..3f116c2 100644
--- 
a/src/main/java/org/apache/sysml/hops/rewrite/RewriteIndexingVectorization.java
+++ 
b/src/main/java/org/apache/sysml/hops/rewrite/RewriteIndexingVectorization.java
@@ -101,7 +101,7 @@ public class RewriteIndexingVectorization extends 
HopRewriteRule
         * @throws HopsException if HopsException occurs
         */
        @SuppressWarnings("unused")
-       private void vectorizeRightIndexing( Hop hop )
+       private static void vectorizeRightIndexing( Hop hop )
                throws HopsException
        {
                if( hop instanceof IndexingOp ) //right indexing
@@ -189,7 +189,7 @@ public class RewriteIndexingVectorization extends 
HopRewriteRule
        }
        
        @SuppressWarnings("unchecked")
-       private Hop vectorizeLeftIndexing( Hop hop )
+       private static Hop vectorizeLeftIndexing( Hop hop )
                throws HopsException
        {
                Hop ret = hop;

http://git-wip-us.apache.org/repos/asf/systemml/blob/13a01758/src/main/java/org/apache/sysml/hops/rewrite/RewriteMarkLoopVariablesUpdateInPlace.java
----------------------------------------------------------------------
diff --git 
a/src/main/java/org/apache/sysml/hops/rewrite/RewriteMarkLoopVariablesUpdateInPlace.java
 
b/src/main/java/org/apache/sysml/hops/rewrite/RewriteMarkLoopVariablesUpdateInPlace.java
index deb7fba..c29820e 100644
--- 
a/src/main/java/org/apache/sysml/hops/rewrite/RewriteMarkLoopVariablesUpdateInPlace.java
+++ 
b/src/main/java/org/apache/sysml/hops/rewrite/RewriteMarkLoopVariablesUpdateInPlace.java
@@ -126,7 +126,7 @@ public class RewriteMarkLoopVariablesUpdateInPlace extends 
StatementBlockRewrite
                return ret;
        }
        
-       private boolean isApplicableForUpdateInPlace( Hop hop, String varname )
+       private static boolean isApplicableForUpdateInPlace( Hop hop, String 
varname )
        {
                if( !hop.getName().equals(varname) )
                        return true;

http://git-wip-us.apache.org/repos/asf/systemml/blob/13a01758/src/main/java/org/apache/sysml/hops/rewrite/RewriteMatrixMultChainOptimization.java
----------------------------------------------------------------------
diff --git 
a/src/main/java/org/apache/sysml/hops/rewrite/RewriteMatrixMultChainOptimization.java
 
b/src/main/java/org/apache/sysml/hops/rewrite/RewriteMatrixMultChainOptimization.java
index 090018b..e8510d4 100644
--- 
a/src/main/java/org/apache/sysml/hops/rewrite/RewriteMatrixMultChainOptimization.java
+++ 
b/src/main/java/org/apache/sysml/hops/rewrite/RewriteMatrixMultChainOptimization.java
@@ -228,7 +228,7 @@ public class RewriteMatrixMultChainOptimization extends 
HopRewriteRule
         * Thomas H. Cormen, Charles E. Leiserson, Ronald L. Rivest, Clifford 
Stein
         * Introduction to Algorithms, Third Edition, MIT Press, page 395.
         */
-       private int[][] mmChainDP(double[] dimArray, int size) 
+       private static int[][] mmChainDP(double[] dimArray, int size) 
        {
                double[][] dpMatrix = new double[size][size]; //min cost table
                int[][] split = new int[size][size]; //min cost index table
@@ -325,7 +325,7 @@ public class RewriteMatrixMultChainOptimization extends 
HopRewriteRule
                }
        }
 
-       private void clearLinksWithinChain( Hop hop, ArrayList<Hop> operators ) 
+       private static void clearLinksWithinChain( Hop hop, ArrayList<Hop> 
operators ) 
                throws HopsException 
        {
                for( int i=0; i < operators.size(); i++ ) {
@@ -354,7 +354,7 @@ public class RewriteMatrixMultChainOptimization extends 
HopRewriteRule
         * @return true if all dimensions known
         * @throws HopsException if HopsException occurs
         */
-       private boolean getDimsArray( Hop hop, ArrayList<Hop> chain, double[] 
dimsArray ) 
+       private static boolean getDimsArray( Hop hop, ArrayList<Hop> chain, 
double[] dimsArray ) 
                throws HopsException 
        {
                boolean dimsKnown = true;
@@ -391,11 +391,11 @@ public class RewriteMatrixMultChainOptimization extends 
HopRewriteRule
                return dimsKnown;
        }
 
-       private int inputCount( Hop p, Hop h ) {
+       private static int inputCount( Hop p, Hop h ) {
                return CollectionUtils.cardinality(h, p.getInput());
        }
        
-       private void logTraceHop( Hop hop, int level ) {
+       private static void logTraceHop( Hop hop, int level ) {
                if( LOG.isTraceEnabled() ) {
                        String offset = Explain.getIdentation(level);
                        LOG.trace(offset+ "Hop " + hop.getName() + "(" + 
hop.getClass().getSimpleName() 

http://git-wip-us.apache.org/repos/asf/systemml/blob/13a01758/src/main/java/org/apache/sysml/hops/rewrite/RewriteSplitDagDataDependentOperators.java
----------------------------------------------------------------------
diff --git 
a/src/main/java/org/apache/sysml/hops/rewrite/RewriteSplitDagDataDependentOperators.java
 
b/src/main/java/org/apache/sysml/hops/rewrite/RewriteSplitDagDataDependentOperators.java
index 67978cb..7e7860e 100644
--- 
a/src/main/java/org/apache/sysml/hops/rewrite/RewriteSplitDagDataDependentOperators.java
+++ 
b/src/main/java/org/apache/sysml/hops/rewrite/RewriteSplitDagDataDependentOperators.java
@@ -318,16 +318,14 @@ public class RewriteSplitDagDataDependentOperators 
extends StatementBlockRewrite
                hop.setVisited();
        }
 
-       private boolean hasTransientWriteParents( Hop hop )
-       {
+       private static boolean hasTransientWriteParents( Hop hop ) {
                for( Hop p : hop.getParent() )
                        if( p instanceof DataOp && 
((DataOp)p).getDataOpType()==DataOpTypes.TRANSIENTWRITE )
                                return true;
                return false;
        }
 
-       private Hop getFirstTransientWriteParent( Hop hop )
-       {
+       private static Hop getFirstTransientWriteParent( Hop hop ) {
                for( Hop p : hop.getParent() )
                        if( p instanceof DataOp && 
((DataOp)p).getDataOpType()==DataOpTypes.TRANSIENTWRITE )
                                return p;

http://git-wip-us.apache.org/repos/asf/systemml/blob/13a01758/src/main/java/org/apache/sysml/lops/CumulativeOffsetBinary.java
----------------------------------------------------------------------
diff --git a/src/main/java/org/apache/sysml/lops/CumulativeOffsetBinary.java 
b/src/main/java/org/apache/sysml/lops/CumulativeOffsetBinary.java
index 5b3bb2a..7237d94 100644
--- a/src/main/java/org/apache/sysml/lops/CumulativeOffsetBinary.java
+++ b/src/main/java/org/apache/sysml/lops/CumulativeOffsetBinary.java
@@ -87,7 +87,7 @@ public class CumulativeOffsetBinary extends Lop
                return "CumulativeOffsetBinary";
        }
 
-       private void checkSupportedOperations(OperationTypes op) 
+       private static void checkSupportedOperations(OperationTypes op) 
                throws LopsException
        {
                //sanity check for supported aggregates

http://git-wip-us.apache.org/repos/asf/systemml/blob/13a01758/src/main/java/org/apache/sysml/lops/CumulativeSplitAggregate.java
----------------------------------------------------------------------
diff --git a/src/main/java/org/apache/sysml/lops/CumulativeSplitAggregate.java 
b/src/main/java/org/apache/sysml/lops/CumulativeSplitAggregate.java
index 14f9359..697b616 100644
--- a/src/main/java/org/apache/sysml/lops/CumulativeSplitAggregate.java
+++ b/src/main/java/org/apache/sysml/lops/CumulativeSplitAggregate.java
@@ -49,11 +49,12 @@ public class CumulativeSplitAggregate extends Lop
                lps.setProperties(inputs, et, ExecLocation.Map, 
breaksAlignment, aligner, definesMRJob);
        }
 
+       @Override
        public String toString() {
                return "CumulativeSplitAggregate";
        }
        
-       private String getOpcode() {
+       private static String getOpcode() {
                return "ucumsplit";
        }
        

http://git-wip-us.apache.org/repos/asf/systemml/blob/13a01758/src/main/java/org/apache/sysml/lops/ZeroOut.java
----------------------------------------------------------------------
diff --git a/src/main/java/org/apache/sysml/lops/ZeroOut.java 
b/src/main/java/org/apache/sysml/lops/ZeroOut.java
index 45cb7f9..20bc766 100644
--- a/src/main/java/org/apache/sysml/lops/ZeroOut.java
+++ b/src/main/java/org/apache/sysml/lops/ZeroOut.java
@@ -67,9 +67,8 @@ public class ZeroOut  extends Lop
                init(input, rowL, rowU, colL, colU, rowDim, colDim, dt, vt, et);
        }
        
-       private String getOpcode() {
-               
-                       return "zeroOut";
+       private static String getOpcode() {
+               return "zeroOut";
        }
        
        @Override

http://git-wip-us.apache.org/repos/asf/systemml/blob/13a01758/src/main/java/org/apache/sysml/lops/compile/Dag.java
----------------------------------------------------------------------
diff --git a/src/main/java/org/apache/sysml/lops/compile/Dag.java 
b/src/main/java/org/apache/sysml/lops/compile/Dag.java
index c09d1c9..91f49f0 100644
--- a/src/main/java/org/apache/sysml/lops/compile/Dag.java
+++ b/src/main/java/org/apache/sysml/lops/compile/Dag.java
@@ -1256,7 +1256,7 @@ public class Dag<N extends Lop>
         * @param delteInst list of instructions
         * @throws DMLRuntimeException if DMLRuntimeException occurs
         */
-       private void processConsumersForInputs(Lop node, ArrayList<Instruction> 
inst, ArrayList<Instruction> delteInst) throws DMLRuntimeException {
+       private static void processConsumersForInputs(Lop node, 
ArrayList<Instruction> inst, ArrayList<Instruction> delteInst) throws 
DMLRuntimeException {
                // reduce the consumer count for all input lops
                // if the count becomes zero, then then variable associated w/ 
input can be removed
                for(Lop in : node.getInputs() ) {
@@ -2271,7 +2271,7 @@ public class Dag<N extends Lop>
                return oinfo;
        }
        
-       private String prepareAssignVarInstruction(Lop input, Lop node) {
+       private static String prepareAssignVarInstruction(Lop input, Lop node) {
                StringBuilder sb = new StringBuilder();
                
                sb.append(ExecType.CP);

http://git-wip-us.apache.org/repos/asf/systemml/blob/13a01758/src/main/java/org/apache/sysml/parser/BuiltinFunctionExpression.java
----------------------------------------------------------------------
diff --git 
a/src/main/java/org/apache/sysml/parser/BuiltinFunctionExpression.java 
b/src/main/java/org/apache/sysml/parser/BuiltinFunctionExpression.java
index 62ed9fb..d63cf7b 100644
--- a/src/main/java/org/apache/sysml/parser/BuiltinFunctionExpression.java
+++ b/src/main/java/org/apache/sysml/parser/BuiltinFunctionExpression.java
@@ -244,7 +244,7 @@ public class BuiltinFunctionExpression extends 
DataIdentifier
                }
        }
        
-       private ArrayList<ParameterExpression> 
orderConvolutionParams(ArrayList<ParameterExpression> paramExpression, 
+       private static ArrayList<ParameterExpression> 
orderConvolutionParams(ArrayList<ParameterExpression> paramExpression, 
                        int skip) throws LanguageException {
                ArrayList<ParameterExpression> newParams = new ArrayList<>();
 
@@ -272,7 +272,7 @@ public class BuiltinFunctionExpression extends 
DataIdentifier
                return newParams;
        }
 
-       private ArrayList<ParameterExpression> 
replaceListParams(ArrayList<ParameterExpression> paramExpression,
+       private static ArrayList<ParameterExpression> 
replaceListParams(ArrayList<ParameterExpression> paramExpression,
                        String inputVarName, String outputVarName, int 
startIndex) throws LanguageException {
                ArrayList<ParameterExpression> newParamExpression = new 
ArrayList<>();
                int i = startIndex;
@@ -289,7 +289,7 @@ public class BuiltinFunctionExpression extends 
DataIdentifier
                return newParamExpression;
        }
 
-       private ArrayList<ParameterExpression> 
expandListParams(ArrayList<ParameterExpression> paramExpression, 
+       private static ArrayList<ParameterExpression> 
expandListParams(ArrayList<ParameterExpression> paramExpression, 
                        HashSet<String> paramsToExpand) throws 
LanguageException {
                ArrayList<ParameterExpression> newParamExpressions = new 
ArrayList<>();
                for(ParameterExpression expr : paramExpression) {
@@ -1299,11 +1299,11 @@ public class BuiltinFunctionExpression extends 
DataIdentifier
                }
        }
 
-       private boolean isConstant(Expression expr) {
+       private static boolean isConstant(Expression expr) {
                return ( expr != null && expr instanceof ConstIdentifier );
        }
        
-       private double getDoubleValue(Expression expr) 
+       private static double getDoubleValue(Expression expr) 
                throws LanguageException 
        {
                if ( expr instanceof DoubleIdentifier )
@@ -1475,11 +1475,11 @@ public class BuiltinFunctionExpression extends 
DataIdentifier
                }
        }
        
-       private boolean is1DMatrix(Expression e) {
+       private static boolean is1DMatrix(Expression e) {
                return (e.getOutput().getDim1() == 1 || e.getOutput().getDim2() 
== 1 );
        }
        
-       private boolean dimsKnown(Expression e) {
+       private static boolean dimsKnown(Expression e) {
                return (e.getOutput().getDim1() != -1 && 
e.getOutput().getDim2() != -1);
        }
        

http://git-wip-us.apache.org/repos/asf/systemml/blob/13a01758/src/main/java/org/apache/sysml/parser/DMLTranslator.java
----------------------------------------------------------------------
diff --git a/src/main/java/org/apache/sysml/parser/DMLTranslator.java 
b/src/main/java/org/apache/sysml/parser/DMLTranslator.java
index d41943d..565c367 100644
--- a/src/main/java/org/apache/sysml/parser/DMLTranslator.java
+++ b/src/main/java/org/apache/sysml/parser/DMLTranslator.java
@@ -1773,7 +1773,7 @@ public class DMLTranslator
                return null;
        }
 
-       private DataIdentifier createTarget(Expression source) {
+       private static DataIdentifier createTarget(Expression source) {
                Identifier id = source.getOutput();
                if (id instanceof DataIdentifier && !(id instanceof 
DataExpression))
                        return (DataIdentifier) id;
@@ -1782,9 +1782,8 @@ public class DMLTranslator
                return target;
        }
 
-       private DataIdentifier createTarget() {
-               DataIdentifier target = new 
DataIdentifier(Expression.getTempName());
-               return target;
+       private static DataIdentifier createTarget() {
+               return new DataIdentifier(Expression.getTempName());
        }
        
         
@@ -2079,7 +2078,7 @@ public class DMLTranslator
                }
        }
 
-       private Hop constructDfHop(String name, DataType dt, ValueType vt, 
ParameterizedBuiltinFunctionOp op, HashMap<String,Hop> paramHops) throws 
HopsException {
+       private static Hop constructDfHop(String name, DataType dt, ValueType 
vt, ParameterizedBuiltinFunctionOp op, HashMap<String,Hop> paramHops) throws 
HopsException {
                
                // Add a hop to paramHops to store distribution information. 
                // Distribution parameter hops would have been already present 
in paramHops.
@@ -3108,7 +3107,7 @@ public class DMLTranslator
                return currBuiltinOp;
        }
        
-       private void setBlockSizeAndRefreshSizeInfo(Hop in, Hop out) {
+       private static void setBlockSizeAndRefreshSizeInfo(Hop in, Hop out) {
                out.setOutputBlocksizes(in.getRowsInBlock(), 
in.getColsInBlock());
                out.refreshSizeInformation();
                HopRewriteUtils.copyLineNumbers(in, out);

http://git-wip-us.apache.org/repos/asf/systemml/blob/13a01758/src/main/java/org/apache/sysml/parser/ForStatementBlock.java
----------------------------------------------------------------------
diff --git a/src/main/java/org/apache/sysml/parser/ForStatementBlock.java 
b/src/main/java/org/apache/sysml/parser/ForStatementBlock.java
index 29358db..07a51db 100644
--- a/src/main/java/org/apache/sysml/parser/ForStatementBlock.java
+++ b/src/main/java/org/apache/sysml/parser/ForStatementBlock.java
@@ -369,7 +369,7 @@ public class ForStatementBlock extends StatementBlock
                        ip.setIncrementExpr(replacementExpr);
        }
        
-       private Expression replaceConstantVar(Expression expr, HashMap<String, 
ConstIdentifier> currConstVars)
+       private static Expression replaceConstantVar(Expression expr, 
HashMap<String, ConstIdentifier> currConstVars)
        {
                Expression ret = null;
                

http://git-wip-us.apache.org/repos/asf/systemml/blob/13a01758/src/main/java/org/apache/sysml/parser/LiveVariableAnalysis.java
----------------------------------------------------------------------
diff --git a/src/main/java/org/apache/sysml/parser/LiveVariableAnalysis.java 
b/src/main/java/org/apache/sysml/parser/LiveVariableAnalysis.java
index cd13cb4..0417edb 100644
--- a/src/main/java/org/apache/sysml/parser/LiveVariableAnalysis.java
+++ b/src/main/java/org/apache/sysml/parser/LiveVariableAnalysis.java
@@ -93,7 +93,7 @@ public abstract class LiveVariableAnalysis
                 updateLiveVariables(_liveOut,liveOut);
        }
        
-       private void updateLiveVariables(VariableSet origVars, VariableSet 
newVars){
+       private static void updateLiveVariables(VariableSet origVars, 
VariableSet newVars){
                for (String var : newVars.getVariables().keySet()){
                        if (origVars.containsVariable(var)){
                                DataIdentifier varId = newVars.getVariable(var);

http://git-wip-us.apache.org/repos/asf/systemml/blob/13a01758/src/main/java/org/apache/sysml/parser/ParForStatementBlock.java
----------------------------------------------------------------------
diff --git a/src/main/java/org/apache/sysml/parser/ParForStatementBlock.java 
b/src/main/java/org/apache/sysml/parser/ParForStatementBlock.java
index 1e9cc15..371b22a 100644
--- a/src/main/java/org/apache/sysml/parser/ParForStatementBlock.java
+++ b/src/main/java/org/apache/sysml/parser/ParForStatementBlock.java
@@ -1746,7 +1746,7 @@ public class ParForStatementBlock extends 
ForStatementBlock
         * @param dat indexed identifier
         * @return string function id
         */
-       private String getFunctionID( IndexedIdentifier dat )
+       private static String getFunctionID( IndexedIdentifier dat )
        {
                /* note: using dat.hashCode can be different for same 
functions, 
                 *       hence, we use a custom String ID
@@ -1777,17 +1777,13 @@ public class ParForStatementBlock extends 
ForStatementBlock
         * 
         * @param f1 linear function
         */
-       private void cleanupFunction( LinearFunction f1 )
-       {
+       private static void cleanupFunction( LinearFunction f1 ) {
                for( int i=0; i<f1._b.length; i++ )
-               {
-                       if( f1._vars[i]==null )
-                       {
+                       if( f1._vars[i]==null ) {
                                f1.removeVar(i);
                                i--; 
                                continue;
-                       }       
-               }
+                       }
        }
        
        /**
@@ -1829,7 +1825,7 @@ public class ParForStatementBlock extends 
ForStatementBlock
         * @param f1 linear function 1
         * @param f2 linear function 2
         */
-       private void forceConsistency(LinearFunction f1, LinearFunction f2) 
+       private static void forceConsistency(LinearFunction f1, LinearFunction 
f2) 
        {
                boolean warn = false;
 
@@ -1979,7 +1975,7 @@ public class ParForStatementBlock extends 
ForStatementBlock
                return ret;
        }
 
-       private Long parseLongConstant(Expression expr)
+       private static Long parseLongConstant(Expression expr)
        {
                Long ret = null;
                

http://git-wip-us.apache.org/repos/asf/systemml/blob/13a01758/src/main/java/org/apache/sysml/parser/dml/DMLParserWrapper.java
----------------------------------------------------------------------
diff --git a/src/main/java/org/apache/sysml/parser/dml/DMLParserWrapper.java 
b/src/main/java/org/apache/sysml/parser/dml/DMLParserWrapper.java
index 337aa18..fb13289 100644
--- a/src/main/java/org/apache/sysml/parser/dml/DMLParserWrapper.java
+++ b/src/main/java/org/apache/sysml/parser/dml/DMLParserWrapper.java
@@ -195,7 +195,7 @@ public class DMLParserWrapper extends ParserWrapper
                return dmlPgm;
        }
        
-       private DMLProgram createDMLProgram(ProgramrootContext ast, String 
sourceNamespace) {
+       private static DMLProgram createDMLProgram(ProgramrootContext ast, 
String sourceNamespace) {
 
                DMLProgram dmlPgm = new DMLProgram();
                String namespace = (sourceNamespace != null && 
sourceNamespace.length() > 0) ? sourceNamespace : DMLProgram.DEFAULT_NAMESPACE;

http://git-wip-us.apache.org/repos/asf/systemml/blob/13a01758/src/main/java/org/apache/sysml/parser/dml/DmlSyntacticValidator.java
----------------------------------------------------------------------
diff --git 
a/src/main/java/org/apache/sysml/parser/dml/DmlSyntacticValidator.java 
b/src/main/java/org/apache/sysml/parser/dml/DmlSyntacticValidator.java
index fbccb44..f42f09f 100644
--- a/src/main/java/org/apache/sysml/parser/dml/DmlSyntacticValidator.java
+++ b/src/main/java/org/apache/sysml/parser/dml/DmlSyntacticValidator.java
@@ -598,8 +598,8 @@ public class DmlSyntacticValidator extends 
CommonSyntacticValidator implements D
        //                      Control Statements - Guards & Loops
        // -----------------------------------------------------------------
 
-       private StatementBlock getStatementBlock(Statement current) {
-               return getStatementBlock(current);
+       private static StatementBlock getStatementBlock(Statement current) {
+               return DMLParserWrapper.getStatementBlock(current);
        }
 
        @Override

http://git-wip-us.apache.org/repos/asf/systemml/blob/13a01758/src/main/java/org/apache/sysml/parser/pydml/PyDMLParserWrapper.java
----------------------------------------------------------------------
diff --git 
a/src/main/java/org/apache/sysml/parser/pydml/PyDMLParserWrapper.java 
b/src/main/java/org/apache/sysml/parser/pydml/PyDMLParserWrapper.java
index 6ba6c94..6865683 100644
--- a/src/main/java/org/apache/sysml/parser/pydml/PyDMLParserWrapper.java
+++ b/src/main/java/org/apache/sysml/parser/pydml/PyDMLParserWrapper.java
@@ -182,7 +182,7 @@ public class PyDMLParserWrapper extends ParserWrapper
        }
 
 
-       private DMLProgram createDMLProgram(ProgramrootContext ast, String 
sourceNamespace) {
+       private static DMLProgram createDMLProgram(ProgramrootContext ast, 
String sourceNamespace) {
 
                DMLProgram dmlPgm = new DMLProgram();
                String namespace = (sourceNamespace != null && 
sourceNamespace.length() > 0) ? sourceNamespace : DMLProgram.DEFAULT_NAMESPACE;

http://git-wip-us.apache.org/repos/asf/systemml/blob/13a01758/src/main/java/org/apache/sysml/parser/pydml/PydmlSyntacticValidator.java
----------------------------------------------------------------------
diff --git 
a/src/main/java/org/apache/sysml/parser/pydml/PydmlSyntacticValidator.java 
b/src/main/java/org/apache/sysml/parser/pydml/PydmlSyntacticValidator.java
index 7385613..d5c5e67 100644
--- a/src/main/java/org/apache/sysml/parser/pydml/PydmlSyntacticValidator.java
+++ b/src/main/java/org/apache/sysml/parser/pydml/PydmlSyntacticValidator.java
@@ -560,7 +560,7 @@ public class PydmlSyntacticValidator extends 
CommonSyntacticValidator implements
         * @param ctx parameter expression
         * @return 0 (along rows), 1 (along column) or -1 (for error)
         */
-       private int getAxis(ParameterExpression ctx) {
+       private static int getAxis(ParameterExpression ctx) {
                if(ctx.getName() != null && ctx.getName() != null) {
                        if(!ctx.getName().equals("axis")) {
                                return -1;
@@ -579,7 +579,7 @@ public class PydmlSyntacticValidator extends 
CommonSyntacticValidator implements
        }
 
        // TODO : Clean up to use Map or some other structure
-       private String getPythonAggFunctionNames(String functionName, int axis) 
{
+       private static String getPythonAggFunctionNames(String functionName, 
int axis) {
                if(axis != 0 && axis != 1) {
                        return functionName;
                }
@@ -1216,8 +1216,8 @@ public class PydmlSyntacticValidator extends 
CommonSyntacticValidator implements
        //                      Control Statements - Guards & Loops
        // -----------------------------------------------------------------
 
-       private StatementBlock getStatementBlock(Statement current) {
-               return getStatementBlock(current);
+       private static StatementBlock getStatementBlock(Statement current) {
+               return PyDMLParserWrapper.getStatementBlock(current);
        }
 
        @Override

http://git-wip-us.apache.org/repos/asf/systemml/blob/13a01758/src/main/java/org/apache/sysml/runtime/codegen/SpoofCellwise.java
----------------------------------------------------------------------
diff --git a/src/main/java/org/apache/sysml/runtime/codegen/SpoofCellwise.java 
b/src/main/java/org/apache/sysml/runtime/codegen/SpoofCellwise.java
index 773badd..86c4ece 100644
--- a/src/main/java/org/apache/sysml/runtime/codegen/SpoofCellwise.java
+++ b/src/main/java/org/apache/sysml/runtime/codegen/SpoofCellwise.java
@@ -227,7 +227,7 @@ public abstract class SpoofCellwise extends SpoofOperator 
implements Serializabl
                        case COL_AGG: out.reset(1, n, false); break;
                        default: throw new DMLRuntimeException("Invalid cell 
type: "+_type);
                }
-               out.allocateDenseOrSparseBlock();
+               out.allocateBlock();
                
                long lnnz = 0;
                if( k <= 1 ) //SINGLE-THREADED

http://git-wip-us.apache.org/repos/asf/systemml/blob/13a01758/src/main/java/org/apache/sysml/runtime/codegen/SpoofOuterProduct.java
----------------------------------------------------------------------
diff --git 
a/src/main/java/org/apache/sysml/runtime/codegen/SpoofOuterProduct.java 
b/src/main/java/org/apache/sysml/runtime/codegen/SpoofOuterProduct.java
index 729d512..4f55c79 100644
--- a/src/main/java/org/apache/sysml/runtime/codegen/SpoofOuterProduct.java
+++ b/src/main/java/org/apache/sysml/runtime/codegen/SpoofOuterProduct.java
@@ -180,7 +180,7 @@ public abstract class SpoofOuterProduct extends 
SpoofOperator
                //check for empty inputs; otherwise allocate result
                if( inputs.get(0).isEmptyBlock(false) )
                        return out;
-               out.allocateDenseOrSparseBlock();
+               out.allocateBlock();
                
                //input preparation
                double[][] ab = getDenseMatrices(prepInputMatrices(inputs, 1, 
2, true, false));
@@ -249,7 +249,7 @@ public abstract class SpoofOuterProduct extends 
SpoofOperator
                {
                        //assign it to the time and sparse representation of 
the major input matrix
                        out.reset(inputs.get(0).getNumRows(), 
inputs.get(0).getNumColumns(), inputs.get(0).isInSparseFormat());
-                       out.allocateDenseOrSparseBlock();
+                       out.allocateBlock();
                }
                else
                {

http://git-wip-us.apache.org/repos/asf/systemml/blob/13a01758/src/main/java/org/apache/sysml/runtime/codegen/SpoofRowwise.java
----------------------------------------------------------------------
diff --git a/src/main/java/org/apache/sysml/runtime/codegen/SpoofRowwise.java 
b/src/main/java/org/apache/sysml/runtime/codegen/SpoofRowwise.java
index 88aafd2..d8a747b 100644
--- a/src/main/java/org/apache/sysml/runtime/codegen/SpoofRowwise.java
+++ b/src/main/java/org/apache/sysml/runtime/codegen/SpoofRowwise.java
@@ -276,7 +276,7 @@ public abstract class SpoofRowwise extends SpoofOperator
                out.allocateDenseBlock();
        }
        
-       private void fixTransposeDimensions(MatrixBlock out) {
+       private static void fixTransposeDimensions(MatrixBlock out) {
                int rlen = out.getNumRows();
                out.setNumRows(out.getNumColumns());
                out.setNumColumns(rlen);

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