http://git-wip-us.apache.org/repos/asf/ignite/blob/9f5dd09b/modules/ml/src/main/java/org/apache/ignite/ml/optimization/updatecalculators/ParameterUpdateCalculator.java
----------------------------------------------------------------------
diff --git 
a/modules/ml/src/main/java/org/apache/ignite/ml/optimization/updatecalculators/ParameterUpdateCalculator.java
 
b/modules/ml/src/main/java/org/apache/ignite/ml/optimization/updatecalculators/ParameterUpdateCalculator.java
index 430483a..6e6a085 100644
--- 
a/modules/ml/src/main/java/org/apache/ignite/ml/optimization/updatecalculators/ParameterUpdateCalculator.java
+++ 
b/modules/ml/src/main/java/org/apache/ignite/ml/optimization/updatecalculators/ParameterUpdateCalculator.java
@@ -18,10 +18,10 @@
 package org.apache.ignite.ml.optimization.updatecalculators;
 
 import java.io.Serializable;
-import org.apache.ignite.ml.math.primitives.matrix.Matrix;
-import org.apache.ignite.ml.math.primitives.vector.Vector;
 import 
org.apache.ignite.ml.math.functions.IgniteDifferentiableVectorToDoubleFunction;
 import org.apache.ignite.ml.math.functions.IgniteFunction;
+import org.apache.ignite.ml.math.primitives.matrix.Matrix;
+import org.apache.ignite.ml.math.primitives.vector.Vector;
 
 /**
  * Interface for classes encapsulating parameters updateCache logic.

http://git-wip-us.apache.org/repos/asf/ignite/blob/9f5dd09b/modules/ml/src/main/java/org/apache/ignite/ml/optimization/updatecalculators/RPropUpdateCalculator.java
----------------------------------------------------------------------
diff --git 
a/modules/ml/src/main/java/org/apache/ignite/ml/optimization/updatecalculators/RPropUpdateCalculator.java
 
b/modules/ml/src/main/java/org/apache/ignite/ml/optimization/updatecalculators/RPropUpdateCalculator.java
index 3a79641..17c4815 100644
--- 
a/modules/ml/src/main/java/org/apache/ignite/ml/optimization/updatecalculators/RPropUpdateCalculator.java
+++ 
b/modules/ml/src/main/java/org/apache/ignite/ml/optimization/updatecalculators/RPropUpdateCalculator.java
@@ -17,11 +17,11 @@
 
 package org.apache.ignite.ml.optimization.updatecalculators;
 
+import 
org.apache.ignite.ml.math.functions.IgniteDifferentiableVectorToDoubleFunction;
+import org.apache.ignite.ml.math.functions.IgniteFunction;
 import org.apache.ignite.ml.math.primitives.matrix.Matrix;
 import org.apache.ignite.ml.math.primitives.vector.Vector;
 import org.apache.ignite.ml.math.primitives.vector.VectorUtils;
-import 
org.apache.ignite.ml.math.functions.IgniteDifferentiableVectorToDoubleFunction;
-import org.apache.ignite.ml.math.functions.IgniteFunction;
 import org.apache.ignite.ml.math.util.MatrixUtil;
 import org.apache.ignite.ml.optimization.SmoothParametrized;
 

http://git-wip-us.apache.org/repos/asf/ignite/blob/9f5dd09b/modules/ml/src/main/java/org/apache/ignite/ml/optimization/updatecalculators/SimpleGDUpdateCalculator.java
----------------------------------------------------------------------
diff --git 
a/modules/ml/src/main/java/org/apache/ignite/ml/optimization/updatecalculators/SimpleGDUpdateCalculator.java
 
b/modules/ml/src/main/java/org/apache/ignite/ml/optimization/updatecalculators/SimpleGDUpdateCalculator.java
index dd23911..ede85c6 100644
--- 
a/modules/ml/src/main/java/org/apache/ignite/ml/optimization/updatecalculators/SimpleGDUpdateCalculator.java
+++ 
b/modules/ml/src/main/java/org/apache/ignite/ml/optimization/updatecalculators/SimpleGDUpdateCalculator.java
@@ -17,10 +17,10 @@
 
 package org.apache.ignite.ml.optimization.updatecalculators;
 
-import org.apache.ignite.ml.math.primitives.matrix.Matrix;
-import org.apache.ignite.ml.math.primitives.vector.Vector;
 import 
org.apache.ignite.ml.math.functions.IgniteDifferentiableVectorToDoubleFunction;
 import org.apache.ignite.ml.math.functions.IgniteFunction;
+import org.apache.ignite.ml.math.primitives.matrix.Matrix;
+import org.apache.ignite.ml.math.primitives.vector.Vector;
 import org.apache.ignite.ml.optimization.SmoothParametrized;
 
 /**

http://git-wip-us.apache.org/repos/asf/ignite/blob/9f5dd09b/modules/ml/src/main/java/org/apache/ignite/ml/preprocessing/binarization/BinarizationPreprocessor.java
----------------------------------------------------------------------
diff --git 
a/modules/ml/src/main/java/org/apache/ignite/ml/preprocessing/binarization/BinarizationPreprocessor.java
 
b/modules/ml/src/main/java/org/apache/ignite/ml/preprocessing/binarization/BinarizationPreprocessor.java
index e6fb0ed..8300820 100644
--- 
a/modules/ml/src/main/java/org/apache/ignite/ml/preprocessing/binarization/BinarizationPreprocessor.java
+++ 
b/modules/ml/src/main/java/org/apache/ignite/ml/preprocessing/binarization/BinarizationPreprocessor.java
@@ -17,8 +17,8 @@
 
 package org.apache.ignite.ml.preprocessing.binarization;
 
-import org.apache.ignite.ml.math.primitives.vector.Vector;
 import org.apache.ignite.ml.math.functions.IgniteBiFunction;
+import org.apache.ignite.ml.math.primitives.vector.Vector;
 
 /**
  * Preprocessing function that makes binarization.

http://git-wip-us.apache.org/repos/asf/ignite/blob/9f5dd09b/modules/ml/src/main/java/org/apache/ignite/ml/preprocessing/binarization/BinarizationTrainer.java
----------------------------------------------------------------------
diff --git 
a/modules/ml/src/main/java/org/apache/ignite/ml/preprocessing/binarization/BinarizationTrainer.java
 
b/modules/ml/src/main/java/org/apache/ignite/ml/preprocessing/binarization/BinarizationTrainer.java
index c84b32f..26541e0 100644
--- 
a/modules/ml/src/main/java/org/apache/ignite/ml/preprocessing/binarization/BinarizationTrainer.java
+++ 
b/modules/ml/src/main/java/org/apache/ignite/ml/preprocessing/binarization/BinarizationTrainer.java
@@ -18,8 +18,8 @@
 package org.apache.ignite.ml.preprocessing.binarization;
 
 import org.apache.ignite.ml.dataset.DatasetBuilder;
-import org.apache.ignite.ml.math.primitives.vector.Vector;
 import org.apache.ignite.ml.math.functions.IgniteBiFunction;
+import org.apache.ignite.ml.math.primitives.vector.Vector;
 import org.apache.ignite.ml.preprocessing.PreprocessingTrainer;
 
 /**

http://git-wip-us.apache.org/repos/asf/ignite/blob/9f5dd09b/modules/ml/src/main/java/org/apache/ignite/ml/preprocessing/encoding/stringencoder/StringEncoderPreprocessor.java
----------------------------------------------------------------------
diff --git 
a/modules/ml/src/main/java/org/apache/ignite/ml/preprocessing/encoding/stringencoder/StringEncoderPreprocessor.java
 
b/modules/ml/src/main/java/org/apache/ignite/ml/preprocessing/encoding/stringencoder/StringEncoderPreprocessor.java
index 46bc748..a1c5b77 100644
--- 
a/modules/ml/src/main/java/org/apache/ignite/ml/preprocessing/encoding/stringencoder/StringEncoderPreprocessor.java
+++ 
b/modules/ml/src/main/java/org/apache/ignite/ml/preprocessing/encoding/stringencoder/StringEncoderPreprocessor.java
@@ -19,10 +19,10 @@ package 
org.apache.ignite.ml.preprocessing.encoding.stringencoder;
 
 import java.util.Map;
 import java.util.Set;
-import org.apache.ignite.ml.math.primitives.vector.Vector;
-import org.apache.ignite.ml.math.primitives.vector.VectorUtils;
 import org.apache.ignite.ml.math.exceptions.preprocessing.UnknownStringValue;
 import org.apache.ignite.ml.math.functions.IgniteBiFunction;
+import org.apache.ignite.ml.math.primitives.vector.Vector;
+import org.apache.ignite.ml.math.primitives.vector.VectorUtils;
 
 /**
  * Preprocessing function that makes String encoding.

http://git-wip-us.apache.org/repos/asf/ignite/blob/9f5dd09b/modules/ml/src/main/java/org/apache/ignite/ml/preprocessing/encoding/stringencoder/StringEncoderTrainer.java
----------------------------------------------------------------------
diff --git 
a/modules/ml/src/main/java/org/apache/ignite/ml/preprocessing/encoding/stringencoder/StringEncoderTrainer.java
 
b/modules/ml/src/main/java/org/apache/ignite/ml/preprocessing/encoding/stringencoder/StringEncoderTrainer.java
index 97cc7f8..ec16af4 100644
--- 
a/modules/ml/src/main/java/org/apache/ignite/ml/preprocessing/encoding/stringencoder/StringEncoderTrainer.java
+++ 
b/modules/ml/src/main/java/org/apache/ignite/ml/preprocessing/encoding/stringencoder/StringEncoderTrainer.java
@@ -27,8 +27,8 @@ import org.apache.ignite.ml.dataset.Dataset;
 import org.apache.ignite.ml.dataset.DatasetBuilder;
 import org.apache.ignite.ml.dataset.UpstreamEntry;
 import org.apache.ignite.ml.dataset.primitive.context.EmptyContext;
-import org.apache.ignite.ml.math.primitives.vector.Vector;
 import org.apache.ignite.ml.math.functions.IgniteBiFunction;
+import org.apache.ignite.ml.math.primitives.vector.Vector;
 import org.apache.ignite.ml.preprocessing.PreprocessingTrainer;
 import org.jetbrains.annotations.NotNull;
 

http://git-wip-us.apache.org/repos/asf/ignite/blob/9f5dd09b/modules/ml/src/main/java/org/apache/ignite/ml/preprocessing/imputing/ImputerPreprocessor.java
----------------------------------------------------------------------
diff --git 
a/modules/ml/src/main/java/org/apache/ignite/ml/preprocessing/imputing/ImputerPreprocessor.java
 
b/modules/ml/src/main/java/org/apache/ignite/ml/preprocessing/imputing/ImputerPreprocessor.java
index 858eff4..3200d23 100644
--- 
a/modules/ml/src/main/java/org/apache/ignite/ml/preprocessing/imputing/ImputerPreprocessor.java
+++ 
b/modules/ml/src/main/java/org/apache/ignite/ml/preprocessing/imputing/ImputerPreprocessor.java
@@ -17,8 +17,8 @@
 
 package org.apache.ignite.ml.preprocessing.imputing;
 
-import org.apache.ignite.ml.math.primitives.vector.Vector;
 import org.apache.ignite.ml.math.functions.IgniteBiFunction;
+import org.apache.ignite.ml.math.primitives.vector.Vector;
 
 /**
  * Preprocessing function that makes imputing.

http://git-wip-us.apache.org/repos/asf/ignite/blob/9f5dd09b/modules/ml/src/main/java/org/apache/ignite/ml/preprocessing/imputing/ImputerTrainer.java
----------------------------------------------------------------------
diff --git 
a/modules/ml/src/main/java/org/apache/ignite/ml/preprocessing/imputing/ImputerTrainer.java
 
b/modules/ml/src/main/java/org/apache/ignite/ml/preprocessing/imputing/ImputerTrainer.java
index 001ef99..090b0a4 100644
--- 
a/modules/ml/src/main/java/org/apache/ignite/ml/preprocessing/imputing/ImputerTrainer.java
+++ 
b/modules/ml/src/main/java/org/apache/ignite/ml/preprocessing/imputing/ImputerTrainer.java
@@ -25,9 +25,9 @@ import org.apache.ignite.ml.dataset.Dataset;
 import org.apache.ignite.ml.dataset.DatasetBuilder;
 import org.apache.ignite.ml.dataset.UpstreamEntry;
 import org.apache.ignite.ml.dataset.primitive.context.EmptyContext;
+import org.apache.ignite.ml.math.functions.IgniteBiFunction;
 import org.apache.ignite.ml.math.primitives.vector.Vector;
 import org.apache.ignite.ml.math.primitives.vector.VectorUtils;
-import org.apache.ignite.ml.math.functions.IgniteBiFunction;
 import org.apache.ignite.ml.preprocessing.PreprocessingTrainer;
 
 /**

http://git-wip-us.apache.org/repos/asf/ignite/blob/9f5dd09b/modules/ml/src/main/java/org/apache/ignite/ml/preprocessing/minmaxscaling/MinMaxScalerPreprocessor.java
----------------------------------------------------------------------
diff --git 
a/modules/ml/src/main/java/org/apache/ignite/ml/preprocessing/minmaxscaling/MinMaxScalerPreprocessor.java
 
b/modules/ml/src/main/java/org/apache/ignite/ml/preprocessing/minmaxscaling/MinMaxScalerPreprocessor.java
index 7c27306..87e369f 100644
--- 
a/modules/ml/src/main/java/org/apache/ignite/ml/preprocessing/minmaxscaling/MinMaxScalerPreprocessor.java
+++ 
b/modules/ml/src/main/java/org/apache/ignite/ml/preprocessing/minmaxscaling/MinMaxScalerPreprocessor.java
@@ -17,8 +17,8 @@
 
 package org.apache.ignite.ml.preprocessing.minmaxscaling;
 
-import org.apache.ignite.ml.math.primitives.vector.Vector;
 import org.apache.ignite.ml.math.functions.IgniteBiFunction;
+import org.apache.ignite.ml.math.primitives.vector.Vector;
 
 /**
  * Preprocessing function that makes minmaxscaling. From mathematical point of 
view it's the following function which

http://git-wip-us.apache.org/repos/asf/ignite/blob/9f5dd09b/modules/ml/src/main/java/org/apache/ignite/ml/preprocessing/minmaxscaling/MinMaxScalerTrainer.java
----------------------------------------------------------------------
diff --git 
a/modules/ml/src/main/java/org/apache/ignite/ml/preprocessing/minmaxscaling/MinMaxScalerTrainer.java
 
b/modules/ml/src/main/java/org/apache/ignite/ml/preprocessing/minmaxscaling/MinMaxScalerTrainer.java
index d927fe6..6a39236 100644
--- 
a/modules/ml/src/main/java/org/apache/ignite/ml/preprocessing/minmaxscaling/MinMaxScalerTrainer.java
+++ 
b/modules/ml/src/main/java/org/apache/ignite/ml/preprocessing/minmaxscaling/MinMaxScalerTrainer.java
@@ -21,8 +21,8 @@ import org.apache.ignite.ml.dataset.Dataset;
 import org.apache.ignite.ml.dataset.DatasetBuilder;
 import org.apache.ignite.ml.dataset.UpstreamEntry;
 import org.apache.ignite.ml.dataset.primitive.context.EmptyContext;
-import org.apache.ignite.ml.math.primitives.vector.Vector;
 import org.apache.ignite.ml.math.functions.IgniteBiFunction;
+import org.apache.ignite.ml.math.primitives.vector.Vector;
 import org.apache.ignite.ml.preprocessing.PreprocessingTrainer;
 
 /**

http://git-wip-us.apache.org/repos/asf/ignite/blob/9f5dd09b/modules/ml/src/main/java/org/apache/ignite/ml/preprocessing/normalization/NormalizationPreprocessor.java
----------------------------------------------------------------------
diff --git 
a/modules/ml/src/main/java/org/apache/ignite/ml/preprocessing/normalization/NormalizationPreprocessor.java
 
b/modules/ml/src/main/java/org/apache/ignite/ml/preprocessing/normalization/NormalizationPreprocessor.java
index 422ed8d..0cd0a90 100644
--- 
a/modules/ml/src/main/java/org/apache/ignite/ml/preprocessing/normalization/NormalizationPreprocessor.java
+++ 
b/modules/ml/src/main/java/org/apache/ignite/ml/preprocessing/normalization/NormalizationPreprocessor.java
@@ -17,10 +17,10 @@
 
 package org.apache.ignite.ml.preprocessing.normalization;
 
-import org.apache.ignite.ml.math.primitives.vector.Vector;
 import org.apache.ignite.ml.math.functions.Functions;
 import org.apache.ignite.ml.math.functions.IgniteBiFunction;
 import org.apache.ignite.ml.math.functions.IgniteDoubleFunction;
+import org.apache.ignite.ml.math.primitives.vector.Vector;
 
 /**
  * Preprocessing function that makes normalization.

http://git-wip-us.apache.org/repos/asf/ignite/blob/9f5dd09b/modules/ml/src/main/java/org/apache/ignite/ml/preprocessing/normalization/NormalizationTrainer.java
----------------------------------------------------------------------
diff --git 
a/modules/ml/src/main/java/org/apache/ignite/ml/preprocessing/normalization/NormalizationTrainer.java
 
b/modules/ml/src/main/java/org/apache/ignite/ml/preprocessing/normalization/NormalizationTrainer.java
index d48bbc6..b2dc6ed 100644
--- 
a/modules/ml/src/main/java/org/apache/ignite/ml/preprocessing/normalization/NormalizationTrainer.java
+++ 
b/modules/ml/src/main/java/org/apache/ignite/ml/preprocessing/normalization/NormalizationTrainer.java
@@ -18,8 +18,8 @@
 package org.apache.ignite.ml.preprocessing.normalization;
 
 import org.apache.ignite.ml.dataset.DatasetBuilder;
-import org.apache.ignite.ml.math.primitives.vector.Vector;
 import org.apache.ignite.ml.math.functions.IgniteBiFunction;
+import org.apache.ignite.ml.math.primitives.vector.Vector;
 import org.apache.ignite.ml.preprocessing.PreprocessingTrainer;
 
 /**

http://git-wip-us.apache.org/repos/asf/ignite/blob/9f5dd09b/modules/ml/src/main/java/org/apache/ignite/ml/regressions/linear/FeatureExtractorWrapper.java
----------------------------------------------------------------------
diff --git 
a/modules/ml/src/main/java/org/apache/ignite/ml/regressions/linear/FeatureExtractorWrapper.java
 
b/modules/ml/src/main/java/org/apache/ignite/ml/regressions/linear/FeatureExtractorWrapper.java
index 1114131..8c3cd8b 100644
--- 
a/modules/ml/src/main/java/org/apache/ignite/ml/regressions/linear/FeatureExtractorWrapper.java
+++ 
b/modules/ml/src/main/java/org/apache/ignite/ml/regressions/linear/FeatureExtractorWrapper.java
@@ -18,9 +18,9 @@
 package org.apache.ignite.ml.regressions.linear;
 
 import java.util.Arrays;
+import org.apache.ignite.ml.math.functions.IgniteBiFunction;
 import org.apache.ignite.ml.math.primitives.vector.Vector;
 import org.apache.ignite.ml.math.primitives.vector.VectorUtils;
-import org.apache.ignite.ml.math.functions.IgniteBiFunction;
 
 /**
  * Feature extractor wrapper that adds additional column filled by 1.

http://git-wip-us.apache.org/repos/asf/ignite/blob/9f5dd09b/modules/ml/src/main/java/org/apache/ignite/ml/regressions/linear/LinearRegressionLSQRTrainer.java
----------------------------------------------------------------------
diff --git 
a/modules/ml/src/main/java/org/apache/ignite/ml/regressions/linear/LinearRegressionLSQRTrainer.java
 
b/modules/ml/src/main/java/org/apache/ignite/ml/regressions/linear/LinearRegressionLSQRTrainer.java
index 0e9941f..8197779 100644
--- 
a/modules/ml/src/main/java/org/apache/ignite/ml/regressions/linear/LinearRegressionLSQRTrainer.java
+++ 
b/modules/ml/src/main/java/org/apache/ignite/ml/regressions/linear/LinearRegressionLSQRTrainer.java
@@ -20,12 +20,12 @@ package org.apache.ignite.ml.regressions.linear;
 import java.util.Arrays;
 import org.apache.ignite.ml.dataset.DatasetBuilder;
 import 
org.apache.ignite.ml.dataset.primitive.builder.data.SimpleLabeledDatasetDataBuilder;
-import org.apache.ignite.ml.math.primitives.vector.Vector;
 import org.apache.ignite.ml.math.functions.IgniteBiFunction;
-import org.apache.ignite.ml.math.primitives.vector.impl.DenseVector;
 import org.apache.ignite.ml.math.isolve.lsqr.AbstractLSQR;
 import org.apache.ignite.ml.math.isolve.lsqr.LSQROnHeap;
 import org.apache.ignite.ml.math.isolve.lsqr.LSQRResult;
+import org.apache.ignite.ml.math.primitives.vector.Vector;
+import org.apache.ignite.ml.math.primitives.vector.impl.DenseVector;
 import org.apache.ignite.ml.trainers.SingleLabelDatasetTrainer;
 
 /**
@@ -33,7 +33,7 @@ import 
org.apache.ignite.ml.trainers.SingleLabelDatasetTrainer;
  *
  * @see AbstractLSQR
  */
-public class LinearRegressionLSQRTrainer implements 
SingleLabelDatasetTrainer<LinearRegressionModel> {
+public class LinearRegressionLSQRTrainer extends 
SingleLabelDatasetTrainer<LinearRegressionModel> {
     /** {@inheritDoc} */
     @Override public <K, V> LinearRegressionModel fit(DatasetBuilder<K, V> 
datasetBuilder,
         IgniteBiFunction<K, V, Vector> featureExtractor, IgniteBiFunction<K, 
V, Double> lbExtractor) {

http://git-wip-us.apache.org/repos/asf/ignite/blob/9f5dd09b/modules/ml/src/main/java/org/apache/ignite/ml/regressions/linear/LinearRegressionModel.java
----------------------------------------------------------------------
diff --git 
a/modules/ml/src/main/java/org/apache/ignite/ml/regressions/linear/LinearRegressionModel.java
 
b/modules/ml/src/main/java/org/apache/ignite/ml/regressions/linear/LinearRegressionModel.java
index 43c5b54..4d9d28e 100644
--- 
a/modules/ml/src/main/java/org/apache/ignite/ml/regressions/linear/LinearRegressionModel.java
+++ 
b/modules/ml/src/main/java/org/apache/ignite/ml/regressions/linear/LinearRegressionModel.java
@@ -99,9 +99,14 @@ public class LinearRegressionModel implements Model<Vector, 
Double>, Exportable<
             return builder.toString();
         }
 
-        return "LinearRegressionModel{" +
+        return "LinearRegressionModel [" +
             "weights=" + weights +
             ", intercept=" + intercept +
-            '}';
+            ']';
+    }
+
+    /** {@inheritDoc} */
+    @Override public String toString(boolean pretty) {
+        return toString();
     }
 }

http://git-wip-us.apache.org/repos/asf/ignite/blob/9f5dd09b/modules/ml/src/main/java/org/apache/ignite/ml/regressions/linear/LinearRegressionSGDTrainer.java
----------------------------------------------------------------------
diff --git 
a/modules/ml/src/main/java/org/apache/ignite/ml/regressions/linear/LinearRegressionSGDTrainer.java
 
b/modules/ml/src/main/java/org/apache/ignite/ml/regressions/linear/LinearRegressionSGDTrainer.java
index e033a98..2237c95 100644
--- 
a/modules/ml/src/main/java/org/apache/ignite/ml/regressions/linear/LinearRegressionSGDTrainer.java
+++ 
b/modules/ml/src/main/java/org/apache/ignite/ml/regressions/linear/LinearRegressionSGDTrainer.java
@@ -23,9 +23,9 @@ import org.apache.ignite.ml.dataset.Dataset;
 import org.apache.ignite.ml.dataset.DatasetBuilder;
 import org.apache.ignite.ml.dataset.primitive.context.EmptyContext;
 import org.apache.ignite.ml.dataset.primitive.data.SimpleLabeledDatasetData;
-import org.apache.ignite.ml.math.primitives.vector.Vector;
 import org.apache.ignite.ml.math.functions.IgniteBiFunction;
 import org.apache.ignite.ml.math.functions.IgniteFunction;
+import org.apache.ignite.ml.math.primitives.vector.Vector;
 import org.apache.ignite.ml.math.primitives.vector.impl.DenseVector;
 import org.apache.ignite.ml.nn.Activators;
 import org.apache.ignite.ml.nn.MLPTrainer;
@@ -38,7 +38,7 @@ import 
org.apache.ignite.ml.trainers.SingleLabelDatasetTrainer;
 /**
  * Trainer of the linear regression model based on stochastic gradient descent 
algorithm.
  */
-public class LinearRegressionSGDTrainer<P extends Serializable> implements 
SingleLabelDatasetTrainer<LinearRegressionModel> {
+public class LinearRegressionSGDTrainer<P extends Serializable> extends 
SingleLabelDatasetTrainer<LinearRegressionModel> {
     /** Update strategy. */
     private final UpdatesStrategy<? super MultilayerPerceptron, P> updatesStgy;
 

http://git-wip-us.apache.org/repos/asf/ignite/blob/9f5dd09b/modules/ml/src/main/java/org/apache/ignite/ml/regressions/logistic/binomial/LogisticRegressionModel.java
----------------------------------------------------------------------
diff --git 
a/modules/ml/src/main/java/org/apache/ignite/ml/regressions/logistic/binomial/LogisticRegressionModel.java
 
b/modules/ml/src/main/java/org/apache/ignite/ml/regressions/logistic/binomial/LogisticRegressionModel.java
index a5938a2..f206532 100644
--- 
a/modules/ml/src/main/java/org/apache/ignite/ml/regressions/logistic/binomial/LogisticRegressionModel.java
+++ 
b/modules/ml/src/main/java/org/apache/ignite/ml/regressions/logistic/binomial/LogisticRegressionModel.java
@@ -192,9 +192,14 @@ public class LogisticRegressionModel implements 
Model<Vector, Double>, Exportabl
             return builder.toString();
         }
 
-        return "LogisticRegressionModel{" +
+        return "LogisticRegressionModel [" +
             "weights=" + weights +
             ", intercept=" + intercept +
-            '}';
+            ']';
+    }
+
+    /** {@inheritDoc} */
+    @Override public String toString(boolean pretty) {
+        return toString();
     }
 }

http://git-wip-us.apache.org/repos/asf/ignite/blob/9f5dd09b/modules/ml/src/main/java/org/apache/ignite/ml/regressions/logistic/binomial/LogisticRegressionSGDTrainer.java
----------------------------------------------------------------------
diff --git 
a/modules/ml/src/main/java/org/apache/ignite/ml/regressions/logistic/binomial/LogisticRegressionSGDTrainer.java
 
b/modules/ml/src/main/java/org/apache/ignite/ml/regressions/logistic/binomial/LogisticRegressionSGDTrainer.java
index 8ec9a7b..840a18d 100644
--- 
a/modules/ml/src/main/java/org/apache/ignite/ml/regressions/logistic/binomial/LogisticRegressionSGDTrainer.java
+++ 
b/modules/ml/src/main/java/org/apache/ignite/ml/regressions/logistic/binomial/LogisticRegressionSGDTrainer.java
@@ -23,9 +23,9 @@ import org.apache.ignite.ml.dataset.Dataset;
 import org.apache.ignite.ml.dataset.DatasetBuilder;
 import org.apache.ignite.ml.dataset.primitive.context.EmptyContext;
 import org.apache.ignite.ml.dataset.primitive.data.SimpleLabeledDatasetData;
-import org.apache.ignite.ml.math.primitives.vector.Vector;
 import org.apache.ignite.ml.math.functions.IgniteBiFunction;
 import org.apache.ignite.ml.math.functions.IgniteFunction;
+import org.apache.ignite.ml.math.primitives.vector.Vector;
 import org.apache.ignite.ml.math.primitives.vector.impl.DenseVector;
 import org.apache.ignite.ml.nn.Activators;
 import org.apache.ignite.ml.nn.MLPTrainer;
@@ -38,7 +38,7 @@ import 
org.apache.ignite.ml.trainers.SingleLabelDatasetTrainer;
 /**
  * Trainer of the logistic regression model based on stochastic gradient 
descent algorithm.
  */
-public class LogisticRegressionSGDTrainer<P extends Serializable> implements 
SingleLabelDatasetTrainer<LogisticRegressionModel> {
+public class LogisticRegressionSGDTrainer<P extends Serializable> extends 
SingleLabelDatasetTrainer<LogisticRegressionModel> {
     /** Update strategy. */
     private final UpdatesStrategy<? super MultilayerPerceptron, P> updatesStgy;
 

http://git-wip-us.apache.org/repos/asf/ignite/blob/9f5dd09b/modules/ml/src/main/java/org/apache/ignite/ml/regressions/logistic/multiclass/LogRegressionMultiClassModel.java
----------------------------------------------------------------------
diff --git 
a/modules/ml/src/main/java/org/apache/ignite/ml/regressions/logistic/multiclass/LogRegressionMultiClassModel.java
 
b/modules/ml/src/main/java/org/apache/ignite/ml/regressions/logistic/multiclass/LogRegressionMultiClassModel.java
index 7e48a21..56d2d29 100644
--- 
a/modules/ml/src/main/java/org/apache/ignite/ml/regressions/logistic/multiclass/LogRegressionMultiClassModel.java
+++ 
b/modules/ml/src/main/java/org/apache/ignite/ml/regressions/logistic/multiclass/LogRegressionMultiClassModel.java
@@ -89,6 +89,11 @@ public class LogRegressionMultiClassModel implements 
Model<Vector, Double>, Expo
         return wholeStr.toString();
     }
 
+    /** {@inheritDoc} */
+    @Override public String toString(boolean pretty) {
+        return toString();
+    }
+
     /**
      * Adds a specific Log Regression binary classifier to the bunch of same 
classifiers.
      *

http://git-wip-us.apache.org/repos/asf/ignite/blob/9f5dd09b/modules/ml/src/main/java/org/apache/ignite/ml/regressions/logistic/multiclass/LogRegressionMultiClassTrainer.java
----------------------------------------------------------------------
diff --git 
a/modules/ml/src/main/java/org/apache/ignite/ml/regressions/logistic/multiclass/LogRegressionMultiClassTrainer.java
 
b/modules/ml/src/main/java/org/apache/ignite/ml/regressions/logistic/multiclass/LogRegressionMultiClassTrainer.java
index 2d18107..1ed938a 100644
--- 
a/modules/ml/src/main/java/org/apache/ignite/ml/regressions/logistic/multiclass/LogRegressionMultiClassTrainer.java
+++ 
b/modules/ml/src/main/java/org/apache/ignite/ml/regressions/logistic/multiclass/LogRegressionMultiClassTrainer.java
@@ -29,8 +29,8 @@ import org.apache.ignite.ml.dataset.Dataset;
 import org.apache.ignite.ml.dataset.DatasetBuilder;
 import org.apache.ignite.ml.dataset.PartitionDataBuilder;
 import org.apache.ignite.ml.dataset.primitive.context.EmptyContext;
-import org.apache.ignite.ml.math.primitives.vector.Vector;
 import org.apache.ignite.ml.math.functions.IgniteBiFunction;
+import org.apache.ignite.ml.math.primitives.vector.Vector;
 import org.apache.ignite.ml.nn.MultilayerPerceptron;
 import org.apache.ignite.ml.nn.UpdatesStrategy;
 import 
org.apache.ignite.ml.regressions.logistic.binomial.LogisticRegressionSGDTrainer;
@@ -42,7 +42,7 @@ import 
org.apache.ignite.ml.trainers.SingleLabelDatasetTrainer;
  * All common parameters are shared with bunch of binary classification 
trainers.
  */
 public class LogRegressionMultiClassTrainer<P extends Serializable>
-    implements SingleLabelDatasetTrainer<LogRegressionMultiClassModel> {
+    extends SingleLabelDatasetTrainer<LogRegressionMultiClassModel> {
     /** Update strategy. */
     private UpdatesStrategy<? super MultilayerPerceptron, P> updatesStgy;
 

http://git-wip-us.apache.org/repos/asf/ignite/blob/9f5dd09b/modules/ml/src/main/java/org/apache/ignite/ml/selection/cv/CrossValidation.java
----------------------------------------------------------------------
diff --git 
a/modules/ml/src/main/java/org/apache/ignite/ml/selection/cv/CrossValidation.java
 
b/modules/ml/src/main/java/org/apache/ignite/ml/selection/cv/CrossValidation.java
index e2fbf89..f417fab 100644
--- 
a/modules/ml/src/main/java/org/apache/ignite/ml/selection/cv/CrossValidation.java
+++ 
b/modules/ml/src/main/java/org/apache/ignite/ml/selection/cv/CrossValidation.java
@@ -27,8 +27,8 @@ import org.apache.ignite.ml.Model;
 import org.apache.ignite.ml.dataset.DatasetBuilder;
 import org.apache.ignite.ml.dataset.impl.cache.CacheBasedDatasetBuilder;
 import org.apache.ignite.ml.dataset.impl.local.LocalDatasetBuilder;
-import org.apache.ignite.ml.math.primitives.vector.Vector;
 import org.apache.ignite.ml.math.functions.IgniteBiFunction;
+import org.apache.ignite.ml.math.primitives.vector.Vector;
 import org.apache.ignite.ml.selection.scoring.cursor.CacheBasedLabelPairCursor;
 import org.apache.ignite.ml.selection.scoring.cursor.LabelPairCursor;
 import org.apache.ignite.ml.selection.scoring.cursor.LocalLabelPairCursor;

http://git-wip-us.apache.org/repos/asf/ignite/blob/9f5dd09b/modules/ml/src/main/java/org/apache/ignite/ml/selection/scoring/cursor/CacheBasedLabelPairCursor.java
----------------------------------------------------------------------
diff --git 
a/modules/ml/src/main/java/org/apache/ignite/ml/selection/scoring/cursor/CacheBasedLabelPairCursor.java
 
b/modules/ml/src/main/java/org/apache/ignite/ml/selection/scoring/cursor/CacheBasedLabelPairCursor.java
index ec8db14..037cf45 100644
--- 
a/modules/ml/src/main/java/org/apache/ignite/ml/selection/scoring/cursor/CacheBasedLabelPairCursor.java
+++ 
b/modules/ml/src/main/java/org/apache/ignite/ml/selection/scoring/cursor/CacheBasedLabelPairCursor.java
@@ -24,8 +24,8 @@ import org.apache.ignite.cache.query.QueryCursor;
 import org.apache.ignite.cache.query.ScanQuery;
 import org.apache.ignite.lang.IgniteBiPredicate;
 import org.apache.ignite.ml.Model;
-import org.apache.ignite.ml.math.primitives.vector.Vector;
 import org.apache.ignite.ml.math.functions.IgniteBiFunction;
+import org.apache.ignite.ml.math.primitives.vector.Vector;
 import org.apache.ignite.ml.selection.scoring.LabelPair;
 import org.jetbrains.annotations.NotNull;
 

http://git-wip-us.apache.org/repos/asf/ignite/blob/9f5dd09b/modules/ml/src/main/java/org/apache/ignite/ml/selection/scoring/cursor/LocalLabelPairCursor.java
----------------------------------------------------------------------
diff --git 
a/modules/ml/src/main/java/org/apache/ignite/ml/selection/scoring/cursor/LocalLabelPairCursor.java
 
b/modules/ml/src/main/java/org/apache/ignite/ml/selection/scoring/cursor/LocalLabelPairCursor.java
index e77608f..f135450 100644
--- 
a/modules/ml/src/main/java/org/apache/ignite/ml/selection/scoring/cursor/LocalLabelPairCursor.java
+++ 
b/modules/ml/src/main/java/org/apache/ignite/ml/selection/scoring/cursor/LocalLabelPairCursor.java
@@ -22,8 +22,8 @@ import java.util.Map;
 import java.util.NoSuchElementException;
 import org.apache.ignite.lang.IgniteBiPredicate;
 import org.apache.ignite.ml.Model;
-import org.apache.ignite.ml.math.primitives.vector.Vector;
 import org.apache.ignite.ml.math.functions.IgniteBiFunction;
+import org.apache.ignite.ml.math.primitives.vector.Vector;
 import org.apache.ignite.ml.selection.scoring.LabelPair;
 import org.jetbrains.annotations.NotNull;
 

http://git-wip-us.apache.org/repos/asf/ignite/blob/9f5dd09b/modules/ml/src/main/java/org/apache/ignite/ml/selection/scoring/evaluator/Evaluator.java
----------------------------------------------------------------------
diff --git 
a/modules/ml/src/main/java/org/apache/ignite/ml/selection/scoring/evaluator/Evaluator.java
 
b/modules/ml/src/main/java/org/apache/ignite/ml/selection/scoring/evaluator/Evaluator.java
index 9620897..4535831 100644
--- 
a/modules/ml/src/main/java/org/apache/ignite/ml/selection/scoring/evaluator/Evaluator.java
+++ 
b/modules/ml/src/main/java/org/apache/ignite/ml/selection/scoring/evaluator/Evaluator.java
@@ -20,8 +20,8 @@ package org.apache.ignite.ml.selection.scoring.evaluator;
 import org.apache.ignite.IgniteCache;
 import org.apache.ignite.lang.IgniteBiPredicate;
 import org.apache.ignite.ml.Model;
-import org.apache.ignite.ml.math.primitives.vector.Vector;
 import org.apache.ignite.ml.math.functions.IgniteBiFunction;
+import org.apache.ignite.ml.math.primitives.vector.Vector;
 import org.apache.ignite.ml.selection.scoring.cursor.CacheBasedLabelPairCursor;
 import org.apache.ignite.ml.selection.scoring.cursor.LabelPairCursor;
 import org.apache.ignite.ml.selection.scoring.metric.Accuracy;

http://git-wip-us.apache.org/repos/asf/ignite/blob/9f5dd09b/modules/ml/src/main/java/org/apache/ignite/ml/structures/LabeledDataset.java
----------------------------------------------------------------------
diff --git 
a/modules/ml/src/main/java/org/apache/ignite/ml/structures/LabeledDataset.java 
b/modules/ml/src/main/java/org/apache/ignite/ml/structures/LabeledDataset.java
index 2968850..2440587 100644
--- 
a/modules/ml/src/main/java/org/apache/ignite/ml/structures/LabeledDataset.java
+++ 
b/modules/ml/src/main/java/org/apache/ignite/ml/structures/LabeledDataset.java
@@ -17,10 +17,10 @@
 
 package org.apache.ignite.ml.structures;
 
-import org.apache.ignite.ml.math.primitives.vector.Vector;
 import org.apache.ignite.ml.math.exceptions.CardinalityException;
 import org.apache.ignite.ml.math.exceptions.NoDataException;
 import org.apache.ignite.ml.math.exceptions.knn.NoLabelVectorException;
+import org.apache.ignite.ml.math.primitives.vector.Vector;
 import org.apache.ignite.ml.math.primitives.vector.impl.DenseVector;
 
 /**

http://git-wip-us.apache.org/repos/asf/ignite/blob/9f5dd09b/modules/ml/src/main/java/org/apache/ignite/ml/structures/partition/LabeledDatasetPartitionDataBuilderOnHeap.java
----------------------------------------------------------------------
diff --git 
a/modules/ml/src/main/java/org/apache/ignite/ml/structures/partition/LabeledDatasetPartitionDataBuilderOnHeap.java
 
b/modules/ml/src/main/java/org/apache/ignite/ml/structures/partition/LabeledDatasetPartitionDataBuilderOnHeap.java
index a7fae03..b4e552b 100644
--- 
a/modules/ml/src/main/java/org/apache/ignite/ml/structures/partition/LabeledDatasetPartitionDataBuilderOnHeap.java
+++ 
b/modules/ml/src/main/java/org/apache/ignite/ml/structures/partition/LabeledDatasetPartitionDataBuilderOnHeap.java
@@ -21,8 +21,8 @@ import java.io.Serializable;
 import java.util.Iterator;
 import org.apache.ignite.ml.dataset.PartitionDataBuilder;
 import org.apache.ignite.ml.dataset.UpstreamEntry;
-import org.apache.ignite.ml.math.primitives.vector.Vector;
 import org.apache.ignite.ml.math.functions.IgniteBiFunction;
+import org.apache.ignite.ml.math.primitives.vector.Vector;
 import org.apache.ignite.ml.structures.LabeledDataset;
 import org.apache.ignite.ml.structures.LabeledVector;
 

http://git-wip-us.apache.org/repos/asf/ignite/blob/9f5dd09b/modules/ml/src/main/java/org/apache/ignite/ml/structures/preprocessing/LabeledDatasetLoader.java
----------------------------------------------------------------------
diff --git 
a/modules/ml/src/main/java/org/apache/ignite/ml/structures/preprocessing/LabeledDatasetLoader.java
 
b/modules/ml/src/main/java/org/apache/ignite/ml/structures/preprocessing/LabeledDatasetLoader.java
index 60ae0f8..5c20d9c 100644
--- 
a/modules/ml/src/main/java/org/apache/ignite/ml/structures/preprocessing/LabeledDatasetLoader.java
+++ 
b/modules/ml/src/main/java/org/apache/ignite/ml/structures/preprocessing/LabeledDatasetLoader.java
@@ -23,11 +23,11 @@ import java.nio.file.Path;
 import java.util.ArrayList;
 import java.util.List;
 import java.util.stream.Stream;
-import org.apache.ignite.ml.math.primitives.vector.Vector;
 import org.apache.ignite.ml.math.exceptions.CardinalityException;
 import org.apache.ignite.ml.math.exceptions.NoDataException;
 import org.apache.ignite.ml.math.exceptions.knn.EmptyFileException;
 import org.apache.ignite.ml.math.exceptions.knn.FileParsingException;
+import org.apache.ignite.ml.math.primitives.vector.Vector;
 import org.apache.ignite.ml.structures.LabeledDataset;
 import org.apache.ignite.ml.structures.LabeledVector;
 import org.jetbrains.annotations.NotNull;

http://git-wip-us.apache.org/repos/asf/ignite/blob/9f5dd09b/modules/ml/src/main/java/org/apache/ignite/ml/svm/SVMLinearBinaryClassificationModel.java
----------------------------------------------------------------------
diff --git 
a/modules/ml/src/main/java/org/apache/ignite/ml/svm/SVMLinearBinaryClassificationModel.java
 
b/modules/ml/src/main/java/org/apache/ignite/ml/svm/SVMLinearBinaryClassificationModel.java
index f0cdbea..4771e4a 100644
--- 
a/modules/ml/src/main/java/org/apache/ignite/ml/svm/SVMLinearBinaryClassificationModel.java
+++ 
b/modules/ml/src/main/java/org/apache/ignite/ml/svm/SVMLinearBinaryClassificationModel.java
@@ -181,9 +181,14 @@ public class SVMLinearBinaryClassificationModel implements 
Model<Vector, Double>
             return builder.toString();
         }
 
-        return "SVMModel{" +
+        return "SVMModel [" +
             "weights=" + weights +
             ", intercept=" + intercept +
-            '}';
+            ']';
+    }
+
+    /** {@inheritDoc} */
+    @Override public String toString(boolean pretty) {
+        return toString();
     }
 }

http://git-wip-us.apache.org/repos/asf/ignite/blob/9f5dd09b/modules/ml/src/main/java/org/apache/ignite/ml/svm/SVMLinearBinaryClassificationTrainer.java
----------------------------------------------------------------------
diff --git 
a/modules/ml/src/main/java/org/apache/ignite/ml/svm/SVMLinearBinaryClassificationTrainer.java
 
b/modules/ml/src/main/java/org/apache/ignite/ml/svm/SVMLinearBinaryClassificationTrainer.java
index 53bb99f..1ae896f 100644
--- 
a/modules/ml/src/main/java/org/apache/ignite/ml/svm/SVMLinearBinaryClassificationTrainer.java
+++ 
b/modules/ml/src/main/java/org/apache/ignite/ml/svm/SVMLinearBinaryClassificationTrainer.java
@@ -22,8 +22,8 @@ import org.apache.ignite.ml.dataset.Dataset;
 import org.apache.ignite.ml.dataset.DatasetBuilder;
 import org.apache.ignite.ml.dataset.PartitionDataBuilder;
 import org.apache.ignite.ml.dataset.primitive.context.EmptyContext;
-import org.apache.ignite.ml.math.primitives.vector.Vector;
 import org.apache.ignite.ml.math.functions.IgniteBiFunction;
+import org.apache.ignite.ml.math.primitives.vector.Vector;
 import org.apache.ignite.ml.math.primitives.vector.impl.DenseVector;
 import org.apache.ignite.ml.structures.LabeledDataset;
 import org.apache.ignite.ml.structures.LabeledVector;
@@ -37,7 +37,7 @@ import org.jetbrains.annotations.NotNull;
  * and +1 labels for two classes and makes binary classification. </p> The 
paper about this algorithm could be found
  * here https://arxiv.org/abs/1409.1458.
  */
-public class SVMLinearBinaryClassificationTrainer implements 
SingleLabelDatasetTrainer<SVMLinearBinaryClassificationModel> {
+public class SVMLinearBinaryClassificationTrainer extends 
SingleLabelDatasetTrainer<SVMLinearBinaryClassificationModel> {
     /** Amount of outer SDCA algorithm iterations. */
     private int amountOfIterations = 200;
 

http://git-wip-us.apache.org/repos/asf/ignite/blob/9f5dd09b/modules/ml/src/main/java/org/apache/ignite/ml/svm/SVMLinearMultiClassClassificationModel.java
----------------------------------------------------------------------
diff --git 
a/modules/ml/src/main/java/org/apache/ignite/ml/svm/SVMLinearMultiClassClassificationModel.java
 
b/modules/ml/src/main/java/org/apache/ignite/ml/svm/SVMLinearMultiClassClassificationModel.java
index 3765110..4b04824 100644
--- 
a/modules/ml/src/main/java/org/apache/ignite/ml/svm/SVMLinearMultiClassClassificationModel.java
+++ 
b/modules/ml/src/main/java/org/apache/ignite/ml/svm/SVMLinearMultiClassClassificationModel.java
@@ -88,6 +88,11 @@ public class SVMLinearMultiClassClassificationModel 
implements Model<Vector, Dou
         return wholeStr.toString();
     }
 
+    /** {@inheritDoc} */
+    @Override public String toString(boolean pretty) {
+        return toString();
+    }
+
     /**
      * Adds a specific SVM binary classifier to the bunch of same classifiers.
      *

http://git-wip-us.apache.org/repos/asf/ignite/blob/9f5dd09b/modules/ml/src/main/java/org/apache/ignite/ml/svm/SVMLinearMultiClassClassificationTrainer.java
----------------------------------------------------------------------
diff --git 
a/modules/ml/src/main/java/org/apache/ignite/ml/svm/SVMLinearMultiClassClassificationTrainer.java
 
b/modules/ml/src/main/java/org/apache/ignite/ml/svm/SVMLinearMultiClassClassificationTrainer.java
index b571d0f..7069c4d 100644
--- 
a/modules/ml/src/main/java/org/apache/ignite/ml/svm/SVMLinearMultiClassClassificationTrainer.java
+++ 
b/modules/ml/src/main/java/org/apache/ignite/ml/svm/SVMLinearMultiClassClassificationTrainer.java
@@ -28,8 +28,8 @@ import org.apache.ignite.ml.dataset.Dataset;
 import org.apache.ignite.ml.dataset.DatasetBuilder;
 import org.apache.ignite.ml.dataset.PartitionDataBuilder;
 import org.apache.ignite.ml.dataset.primitive.context.EmptyContext;
-import org.apache.ignite.ml.math.primitives.vector.Vector;
 import org.apache.ignite.ml.math.functions.IgniteBiFunction;
+import org.apache.ignite.ml.math.primitives.vector.Vector;
 import 
org.apache.ignite.ml.structures.partition.LabelPartitionDataBuilderOnHeap;
 import org.apache.ignite.ml.structures.partition.LabelPartitionDataOnHeap;
 import org.apache.ignite.ml.trainers.SingleLabelDatasetTrainer;
@@ -41,7 +41,7 @@ import 
org.apache.ignite.ml.trainers.SingleLabelDatasetTrainer;
  * All common parameters are shared with bunch of binary classification 
trainers.
  */
 public class SVMLinearMultiClassClassificationTrainer
-    implements 
SingleLabelDatasetTrainer<SVMLinearMultiClassClassificationModel> {
+    extends SingleLabelDatasetTrainer<SVMLinearMultiClassClassificationModel> {
     /** Amount of outer SDCA algorithm iterations. */
     private int amountOfIterations = 20;
 

http://git-wip-us.apache.org/repos/asf/ignite/blob/9f5dd09b/modules/ml/src/main/java/org/apache/ignite/ml/trainers/DatasetTrainer.java
----------------------------------------------------------------------
diff --git 
a/modules/ml/src/main/java/org/apache/ignite/ml/trainers/DatasetTrainer.java 
b/modules/ml/src/main/java/org/apache/ignite/ml/trainers/DatasetTrainer.java
index 3fe0aa4..2f5d5d6 100644
--- a/modules/ml/src/main/java/org/apache/ignite/ml/trainers/DatasetTrainer.java
+++ b/modules/ml/src/main/java/org/apache/ignite/ml/trainers/DatasetTrainer.java
@@ -25,8 +25,9 @@ import org.apache.ignite.ml.Model;
 import org.apache.ignite.ml.dataset.DatasetBuilder;
 import org.apache.ignite.ml.dataset.impl.cache.CacheBasedDatasetBuilder;
 import org.apache.ignite.ml.dataset.impl.local.LocalDatasetBuilder;
-import org.apache.ignite.ml.math.primitives.vector.Vector;
+import org.apache.ignite.ml.environment.LearningEnvironment;
 import org.apache.ignite.ml.math.functions.IgniteBiFunction;
+import org.apache.ignite.ml.math.primitives.vector.Vector;
 
 /**
  * Interface for trainers. Trainer is just a function which produces model 
from the data.
@@ -34,7 +35,10 @@ import org.apache.ignite.ml.math.functions.IgniteBiFunction;
  * @param <M> Type of a produced model.
  * @param <L> Type of a label.
  */
-public interface DatasetTrainer<M extends Model, L> {
+public abstract class DatasetTrainer<M extends Model, L> {
+    /** Learning Environment. */
+    protected LearningEnvironment environment = LearningEnvironment.DEFAULT;
+
     /**
      * Trains model based on the specified data.
      *
@@ -45,7 +49,7 @@ public interface DatasetTrainer<M extends Model, L> {
      * @param <V> Type of a value in {@code upstream} data.
      * @return Model.
      */
-    public <K, V> M fit(DatasetBuilder<K, V> datasetBuilder, 
IgniteBiFunction<K, V, Vector> featureExtractor,
+    public abstract <K, V> M fit(DatasetBuilder<K, V> datasetBuilder, 
IgniteBiFunction<K, V, Vector> featureExtractor,
         IgniteBiFunction<K, V, L> lbExtractor);
 
     /**
@@ -59,7 +63,7 @@ public interface DatasetTrainer<M extends Model, L> {
      * @param <V> Type of a value in {@code upstream} data.
      * @return Model.
      */
-    public default <K, V> M fit(Ignite ignite, IgniteCache<K, V> cache,
+    public <K, V> M fit(Ignite ignite, IgniteCache<K, V> cache,
         IgniteBiFunction<K, V, Vector> featureExtractor, IgniteBiFunction<K, 
V, L> lbExtractor) {
         return fit(
             new CacheBasedDatasetBuilder<>(ignite, cache),
@@ -80,7 +84,7 @@ public interface DatasetTrainer<M extends Model, L> {
      * @param <V> Type of a value in {@code upstream} data.
      * @return Model.
      */
-    public default <K, V> M fit(Ignite ignite, IgniteCache<K, V> cache, 
IgniteBiPredicate<K, V> filter,
+    public <K, V> M fit(Ignite ignite, IgniteCache<K, V> cache, 
IgniteBiPredicate<K, V> filter,
         IgniteBiFunction<K, V, Vector> featureExtractor, IgniteBiFunction<K, 
V, L> lbExtractor) {
         return fit(
             new CacheBasedDatasetBuilder<>(ignite, cache, filter),
@@ -100,7 +104,7 @@ public interface DatasetTrainer<M extends Model, L> {
      * @param <V> Type of a value in {@code upstream} data.
      * @return Model.
      */
-    public default <K, V> M fit(Map<K, V> data, int parts, IgniteBiFunction<K, 
V, Vector> featureExtractor,
+    public <K, V> M fit(Map<K, V> data, int parts, IgniteBiFunction<K, V, 
Vector> featureExtractor,
         IgniteBiFunction<K, V, L> lbExtractor) {
         return fit(
             new LocalDatasetBuilder<>(data, parts),
@@ -121,7 +125,7 @@ public interface DatasetTrainer<M extends Model, L> {
      * @param <V> Type of a value in {@code upstream} data.
      * @return Model.
      */
-    public default <K, V> M fit(Map<K, V> data, IgniteBiPredicate<K, V> 
filter, int parts,
+    public <K, V> M fit(Map<K, V> data, IgniteBiPredicate<K, V> filter, int 
parts,
         IgniteBiFunction<K, V, Vector> featureExtractor,
         IgniteBiFunction<K, V, L> lbExtractor) {
         return fit(
@@ -130,4 +134,12 @@ public interface DatasetTrainer<M extends Model, L> {
             lbExtractor
         );
     }
+
+    /**
+     * Sets learning Environment
+     * @param environment Environment.
+     */
+    public void setEnvironment(LearningEnvironment environment) {
+        this.environment = environment;
+    }
 }

http://git-wip-us.apache.org/repos/asf/ignite/blob/9f5dd09b/modules/ml/src/main/java/org/apache/ignite/ml/trainers/MultiLabelDatasetTrainer.java
----------------------------------------------------------------------
diff --git 
a/modules/ml/src/main/java/org/apache/ignite/ml/trainers/MultiLabelDatasetTrainer.java
 
b/modules/ml/src/main/java/org/apache/ignite/ml/trainers/MultiLabelDatasetTrainer.java
index 0c6518f..5ae7de8 100644
--- 
a/modules/ml/src/main/java/org/apache/ignite/ml/trainers/MultiLabelDatasetTrainer.java
+++ 
b/modules/ml/src/main/java/org/apache/ignite/ml/trainers/MultiLabelDatasetTrainer.java
@@ -24,5 +24,5 @@ import org.apache.ignite.ml.Model;
  *
  * @param <M> Type of a produced model.
  */
-public interface MultiLabelDatasetTrainer<M extends Model> extends 
DatasetTrainer<M, double[]> {
+public abstract class MultiLabelDatasetTrainer<M extends Model> extends 
DatasetTrainer<M, double[]> {
 }

http://git-wip-us.apache.org/repos/asf/ignite/blob/9f5dd09b/modules/ml/src/main/java/org/apache/ignite/ml/trainers/SingleLabelDatasetTrainer.java
----------------------------------------------------------------------
diff --git 
a/modules/ml/src/main/java/org/apache/ignite/ml/trainers/SingleLabelDatasetTrainer.java
 
b/modules/ml/src/main/java/org/apache/ignite/ml/trainers/SingleLabelDatasetTrainer.java
index eec8855..38dda93 100644
--- 
a/modules/ml/src/main/java/org/apache/ignite/ml/trainers/SingleLabelDatasetTrainer.java
+++ 
b/modules/ml/src/main/java/org/apache/ignite/ml/trainers/SingleLabelDatasetTrainer.java
@@ -24,5 +24,5 @@ import org.apache.ignite.ml.Model;
  *
  * @param <M> Type of a produced model.
  */
-public interface SingleLabelDatasetTrainer<M extends Model> extends 
DatasetTrainer<M, Double> {
+public abstract class SingleLabelDatasetTrainer<M extends Model> extends 
DatasetTrainer<M, Double> {
 }

http://git-wip-us.apache.org/repos/asf/ignite/blob/9f5dd09b/modules/ml/src/main/java/org/apache/ignite/ml/tree/DecisionTree.java
----------------------------------------------------------------------
diff --git 
a/modules/ml/src/main/java/org/apache/ignite/ml/tree/DecisionTree.java 
b/modules/ml/src/main/java/org/apache/ignite/ml/tree/DecisionTree.java
index 9a912f7..c94d2dd 100644
--- a/modules/ml/src/main/java/org/apache/ignite/ml/tree/DecisionTree.java
+++ b/modules/ml/src/main/java/org/apache/ignite/ml/tree/DecisionTree.java
@@ -19,12 +19,13 @@ package org.apache.ignite.ml.tree;
 
 import java.io.Serializable;
 import java.util.Arrays;
+import java.util.Collections;
 import org.apache.ignite.ml.dataset.Dataset;
 import org.apache.ignite.ml.dataset.DatasetBuilder;
 import 
org.apache.ignite.ml.dataset.primitive.builder.context.EmptyContextBuilder;
 import org.apache.ignite.ml.dataset.primitive.context.EmptyContext;
-import org.apache.ignite.ml.math.primitives.vector.Vector;
 import org.apache.ignite.ml.math.functions.IgniteBiFunction;
+import org.apache.ignite.ml.math.primitives.vector.Vector;
 import org.apache.ignite.ml.trainers.DatasetTrainer;
 import org.apache.ignite.ml.tree.data.DecisionTreeData;
 import org.apache.ignite.ml.tree.data.DecisionTreeDataBuilder;
@@ -39,7 +40,7 @@ import org.apache.ignite.ml.tree.leaf.DecisionTreeLeafBuilder;
  *
  * @param <T> Type of impurity measure.
  */
-public abstract class DecisionTree<T extends ImpurityMeasure<T>> implements 
DatasetTrainer<DecisionTreeNode, Double> {
+public abstract class DecisionTree<T extends ImpurityMeasure<T>> extends 
DatasetTrainer<DecisionTreeNode, Double> {
     /** Max tree deep. */
     private final int maxDeep;
 
@@ -60,7 +61,8 @@ public abstract class DecisionTree<T extends 
ImpurityMeasure<T>> implements Data
      * @param compressor Impurity function compressor.
      * @param decisionTreeLeafBuilder Decision tree leaf builder.
      */
-    DecisionTree(int maxDeep, double minImpurityDecrease, 
StepFunctionCompressor<T> compressor, DecisionTreeLeafBuilder 
decisionTreeLeafBuilder) {
+    DecisionTree(int maxDeep, double minImpurityDecrease, 
StepFunctionCompressor<T> compressor,
+        DecisionTreeLeafBuilder decisionTreeLeafBuilder) {
         this.maxDeep = maxDeep;
         this.minImpurityDecrease = minImpurityDecrease;
         this.compressor = compressor;
@@ -131,7 +133,8 @@ public abstract class DecisionTree<T extends 
ImpurityMeasure<T>> implements Data
      */
     private StepFunction<T>[] 
calculateImpurityForAllColumns(Dataset<EmptyContext, DecisionTreeData> dataset,
         TreeFilter filter, ImpurityMeasureCalculator<T> impurityCalc) {
-        return dataset.compute(
+
+        StepFunction<T>[] result = dataset.compute(
             part -> {
                 if (compressor != null)
                     return 
compressor.compress(impurityCalc.calculate(part.filter(filter)));
@@ -139,6 +142,8 @@ public abstract class DecisionTree<T extends 
ImpurityMeasure<T>> implements Data
                     return impurityCalc.calculate(part.filter(filter));
             }, this::reduce
         );
+
+        return result;
     }
 
     /**
@@ -250,4 +255,47 @@ public abstract class DecisionTree<T extends 
ImpurityMeasure<T>> implements Data
             this.threshold = threshold;
         }
     }
+
+    /**
+     * Represents DecisionTree as String.
+     *
+     * @param node Decision tree.
+     * @param pretty Use pretty mode.
+     */
+    public static String printTree(DecisionTreeNode node, boolean pretty) {
+        StringBuilder builder = new StringBuilder();
+        printTree(node, 0, builder, pretty, false);
+        return builder.toString();
+    }
+
+    /**
+     * Recursive realisation of DectisionTree to String converting.
+     *
+     * @param node Decision tree.
+     * @param depth Current depth.
+     * @param builder String builder.
+     * @param pretty Use pretty mode.
+     */
+    private static void printTree(DecisionTreeNode node, int depth, 
StringBuilder builder, boolean pretty, boolean isThen) {
+        builder.append(pretty ? String.join("", Collections.nCopies(depth, 
"\t")) : "");
+        if (node instanceof DecisionTreeLeafNode) {
+            DecisionTreeLeafNode leaf = (DecisionTreeLeafNode)node;
+            builder.append(String.format("%s return ", isThen ? "then" : 
"else"))
+                .append(String.format("%.4f", leaf.getVal()));
+        }
+        else if (node instanceof DecisionTreeConditionalNode) {
+            DecisionTreeConditionalNode condition = 
(DecisionTreeConditionalNode)node;
+            String prefix = depth == 0 ? "" : (isThen ? "then " : "else ");
+            builder.append(String.format("%sif (x", prefix))
+                .append(condition.getCol())
+                .append(" > ")
+                .append(String.format("%.4f", condition.getThreshold()))
+                .append(pretty ? ")\n" : ") ");
+            printTree(condition.getThenNode(), depth + 1, builder, pretty, 
true);
+            builder.append(pretty ? "\n" : " ");
+            printTree(condition.getElseNode(), depth + 1, builder, pretty, 
false);
+        }
+        else
+            throw new IllegalArgumentException();
+    }
 }

http://git-wip-us.apache.org/repos/asf/ignite/blob/9f5dd09b/modules/ml/src/main/java/org/apache/ignite/ml/tree/DecisionTreeConditionalNode.java
----------------------------------------------------------------------
diff --git 
a/modules/ml/src/main/java/org/apache/ignite/ml/tree/DecisionTreeConditionalNode.java
 
b/modules/ml/src/main/java/org/apache/ignite/ml/tree/DecisionTreeConditionalNode.java
index 110c199..f598165 100644
--- 
a/modules/ml/src/main/java/org/apache/ignite/ml/tree/DecisionTreeConditionalNode.java
+++ 
b/modules/ml/src/main/java/org/apache/ignite/ml/tree/DecisionTreeConditionalNode.java
@@ -77,4 +77,14 @@ public class DecisionTreeConditionalNode implements 
DecisionTreeNode {
     public DecisionTreeNode getElseNode() {
         return elseNode;
     }
+
+    /** {@inheritDoc} */
+    @Override public String toString() {
+        return toString(false);
+    }
+
+    /** {@inheritDoc} */
+    @Override public String toString(boolean pretty) {
+        return DecisionTree.printTree(this, pretty);
+    }
 }

http://git-wip-us.apache.org/repos/asf/ignite/blob/9f5dd09b/modules/ml/src/main/java/org/apache/ignite/ml/tree/DecisionTreeLeafNode.java
----------------------------------------------------------------------
diff --git 
a/modules/ml/src/main/java/org/apache/ignite/ml/tree/DecisionTreeLeafNode.java 
b/modules/ml/src/main/java/org/apache/ignite/ml/tree/DecisionTreeLeafNode.java
index 7194511..97cc3ee 100644
--- 
a/modules/ml/src/main/java/org/apache/ignite/ml/tree/DecisionTreeLeafNode.java
+++ 
b/modules/ml/src/main/java/org/apache/ignite/ml/tree/DecisionTreeLeafNode.java
@@ -47,4 +47,14 @@ public class DecisionTreeLeafNode implements 
DecisionTreeNode {
     public double getVal() {
         return val;
     }
+
+    /** {@inheritDoc} */
+    @Override public String toString() {
+        return toString(false);
+    }
+
+    /** {@inheritDoc} */
+    @Override public String toString(boolean pretty) {
+        return DecisionTree.printTree(this, pretty);
+    }
 }

http://git-wip-us.apache.org/repos/asf/ignite/blob/9f5dd09b/modules/ml/src/main/java/org/apache/ignite/ml/tree/data/DecisionTreeDataBuilder.java
----------------------------------------------------------------------
diff --git 
a/modules/ml/src/main/java/org/apache/ignite/ml/tree/data/DecisionTreeDataBuilder.java
 
b/modules/ml/src/main/java/org/apache/ignite/ml/tree/data/DecisionTreeDataBuilder.java
index 9f8f2f7..0ff2012 100644
--- 
a/modules/ml/src/main/java/org/apache/ignite/ml/tree/data/DecisionTreeDataBuilder.java
+++ 
b/modules/ml/src/main/java/org/apache/ignite/ml/tree/data/DecisionTreeDataBuilder.java
@@ -21,8 +21,8 @@ import java.io.Serializable;
 import java.util.Iterator;
 import org.apache.ignite.ml.dataset.PartitionDataBuilder;
 import org.apache.ignite.ml.dataset.UpstreamEntry;
-import org.apache.ignite.ml.math.primitives.vector.Vector;
 import org.apache.ignite.ml.math.functions.IgniteBiFunction;
+import org.apache.ignite.ml.math.primitives.vector.Vector;
 
 /**
  * A partition {@code data} builder that makes {@link DecisionTreeData}.

http://git-wip-us.apache.org/repos/asf/ignite/blob/9f5dd09b/modules/ml/src/main/java/org/apache/ignite/ml/util/ModelTrace.java
----------------------------------------------------------------------
diff --git a/modules/ml/src/main/java/org/apache/ignite/ml/util/ModelTrace.java 
b/modules/ml/src/main/java/org/apache/ignite/ml/util/ModelTrace.java
new file mode 100644
index 0000000..e6539d2
--- /dev/null
+++ b/modules/ml/src/main/java/org/apache/ignite/ml/util/ModelTrace.java
@@ -0,0 +1,130 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one or more
+ * contributor license agreements.  See the NOTICE file distributed with
+ * this work for additional information regarding copyright ownership.
+ * The ASF licenses this file to You under the Apache License, Version 2.0
+ * (the "License"); you may not use this file except in compliance with
+ * the License.  You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package org.apache.ignite.ml.util;
+
+import java.util.ArrayList;
+import java.util.List;
+import java.util.stream.Collectors;
+import org.apache.ignite.lang.IgniteBiTuple;
+import org.jetbrains.annotations.NotNull;
+
+/**
+ * Helper for model tracing.
+ */
+public class ModelTrace {
+    /** Model name. */
+    private final String mdlName;
+    /** Use pretty mode. */
+    private final boolean pretty;
+    /** Model fields. */
+    private List<IgniteBiTuple<String, Object>> mdlFields = new ArrayList<>();
+
+    /**
+     * Creates an instance of ModelTrace.
+     *
+     * @param mdlName Model name.
+     * @param pretty Pretty.
+     */
+    public static ModelTrace builder(String mdlName, boolean pretty) {
+        return new ModelTrace(mdlName, pretty);
+    }
+
+    /**
+     * Creates an instance of ModelTrace.
+     *
+     * @param mdlName Model name.
+     */
+    public static ModelTrace builder(String mdlName) {
+        return new ModelTrace(mdlName, false);
+    }
+
+    /**
+     * Creates an instance of ModelTrace.
+     *
+     * @param mdlName Model name.
+     * @param pretty Pretty.
+     */
+    private ModelTrace(String mdlName, boolean pretty) {
+        this.mdlName = mdlName;
+        this.pretty = pretty;
+    }
+
+    /**
+     * Add field.
+     *
+     * @param name Name.
+     * @param value Value.
+     */
+    public ModelTrace addField(String name, String value) {
+        mdlFields.add(new IgniteBiTuple<>(name, value));
+        return this;
+    }
+
+    /**
+     * Add field.
+     *
+     * @param name Name.
+     * @param values Values.
+     */
+    public ModelTrace addField(String name, List values) {
+        mdlFields.add(new IgniteBiTuple<>(name, values));
+        return this;
+    }
+
+    /** {@inheritDoc} */
+    @Override public String toString() {
+        StringBuilder builder = new StringBuilder();
+
+        final String ending = pretty ? "\n" : "";
+        final String fields = mdlFields.stream()
+            .map(kv -> fieldToString(kv, pretty))
+            .collect(Collectors.joining(pretty ? ",\n" : ", "));
+
+        builder.append(mdlName)
+            .append(" [").append(ending)
+            .append(fields)
+            .append(ending).append("]");
+
+        return builder.toString();
+    }
+
+    /**
+     * Convert Field Name-Value pair to string.
+     *
+     * @param kv Field name and value.
+     * @param pretty Use pretty mode.
+     */
+    @NotNull private String fieldToString(IgniteBiTuple<String, Object> kv, 
boolean pretty) {
+        StringBuilder builder = new StringBuilder(pretty ? "\t" : "")
+            .append(kv.getKey()).append(" = [");
+        if (kv.getValue() instanceof List) {
+            List list = (List)kv.getValue();
+            builder
+                .append(pretty ? "\n" : "")
+                .append(list.stream()
+                    .map(x -> (pretty ? "\t\t" : "") + x)
+                    .collect(Collectors.joining(pretty ? ",\n" : ", ")))
+                .append(pretty ? "\n\t]" : "]");
+        }
+        else {
+            builder.append(kv.getValue().toString())
+                .append("]");
+        }
+        return builder.toString();
+    }
+}

http://git-wip-us.apache.org/repos/asf/ignite/blob/9f5dd09b/modules/ml/src/test/java/org/apache/ignite/ml/LocalModelsTest.java
----------------------------------------------------------------------
diff --git a/modules/ml/src/test/java/org/apache/ignite/ml/LocalModelsTest.java 
b/modules/ml/src/test/java/org/apache/ignite/ml/LocalModelsTest.java
index 43a80a9..3e3bab5 100644
--- a/modules/ml/src/test/java/org/apache/ignite/ml/LocalModelsTest.java
+++ b/modules/ml/src/test/java/org/apache/ignite/ml/LocalModelsTest.java
@@ -31,8 +31,8 @@ import 
org.apache.ignite.ml.dataset.impl.local.LocalDatasetBuilder;
 import org.apache.ignite.ml.knn.classification.KNNClassificationModel;
 import org.apache.ignite.ml.knn.classification.KNNModelFormat;
 import org.apache.ignite.ml.knn.classification.KNNStrategy;
-import org.apache.ignite.ml.math.primitives.vector.VectorUtils;
 import org.apache.ignite.ml.math.distances.EuclideanDistance;
+import org.apache.ignite.ml.math.primitives.vector.VectorUtils;
 import org.apache.ignite.ml.math.primitives.vector.impl.DenseVector;
 import org.apache.ignite.ml.regressions.linear.LinearRegressionModel;
 import org.apache.ignite.ml.svm.SVMLinearBinaryClassificationModel;

http://git-wip-us.apache.org/repos/asf/ignite/blob/9f5dd09b/modules/ml/src/test/java/org/apache/ignite/ml/TestUtils.java
----------------------------------------------------------------------
diff --git a/modules/ml/src/test/java/org/apache/ignite/ml/TestUtils.java 
b/modules/ml/src/test/java/org/apache/ignite/ml/TestUtils.java
index 64e3436..a4591fb 100644
--- a/modules/ml/src/test/java/org/apache/ignite/ml/TestUtils.java
+++ b/modules/ml/src/test/java/org/apache/ignite/ml/TestUtils.java
@@ -18,8 +18,8 @@
 package org.apache.ignite.ml;
 
 import java.util.stream.IntStream;
-import org.apache.ignite.ml.math.primitives.matrix.Matrix;
 import org.apache.ignite.ml.math.Precision;
+import org.apache.ignite.ml.math.primitives.matrix.Matrix;
 import org.apache.ignite.ml.math.primitives.vector.Vector;
 import org.junit.Assert;
 

http://git-wip-us.apache.org/repos/asf/ignite/blob/9f5dd09b/modules/ml/src/test/java/org/apache/ignite/ml/clustering/KMeansModelTest.java
----------------------------------------------------------------------
diff --git 
a/modules/ml/src/test/java/org/apache/ignite/ml/clustering/KMeansModelTest.java 
b/modules/ml/src/test/java/org/apache/ignite/ml/clustering/KMeansModelTest.java
index 611b526..0d95d05 100644
--- 
a/modules/ml/src/test/java/org/apache/ignite/ml/clustering/KMeansModelTest.java
+++ 
b/modules/ml/src/test/java/org/apache/ignite/ml/clustering/KMeansModelTest.java
@@ -18,9 +18,9 @@
 package org.apache.ignite.ml.clustering;
 
 import org.apache.ignite.ml.clustering.kmeans.KMeansModel;
-import org.apache.ignite.ml.math.primitives.vector.Vector;
 import org.apache.ignite.ml.math.distances.DistanceMeasure;
 import org.apache.ignite.ml.math.distances.EuclideanDistance;
+import org.apache.ignite.ml.math.primitives.vector.Vector;
 import org.apache.ignite.ml.math.primitives.vector.impl.DenseVector;
 import org.junit.Assert;
 import org.junit.Test;

http://git-wip-us.apache.org/repos/asf/ignite/blob/9f5dd09b/modules/ml/src/test/java/org/apache/ignite/ml/clustering/KMeansTrainerTest.java
----------------------------------------------------------------------
diff --git 
a/modules/ml/src/test/java/org/apache/ignite/ml/clustering/KMeansTrainerTest.java
 
b/modules/ml/src/test/java/org/apache/ignite/ml/clustering/KMeansTrainerTest.java
index 0bb4e01..8d2c341 100644
--- 
a/modules/ml/src/test/java/org/apache/ignite/ml/clustering/KMeansTrainerTest.java
+++ 
b/modules/ml/src/test/java/org/apache/ignite/ml/clustering/KMeansTrainerTest.java
@@ -23,9 +23,9 @@ import java.util.Map;
 import org.apache.ignite.ml.clustering.kmeans.KMeansModel;
 import org.apache.ignite.ml.clustering.kmeans.KMeansTrainer;
 import org.apache.ignite.ml.dataset.impl.local.LocalDatasetBuilder;
+import org.apache.ignite.ml.math.distances.EuclideanDistance;
 import org.apache.ignite.ml.math.primitives.vector.Vector;
 import org.apache.ignite.ml.math.primitives.vector.VectorUtils;
-import org.apache.ignite.ml.math.distances.EuclideanDistance;
 import org.apache.ignite.ml.math.primitives.vector.impl.DenseVector;
 import org.junit.Test;
 

http://git-wip-us.apache.org/repos/asf/ignite/blob/9f5dd09b/modules/ml/src/test/java/org/apache/ignite/ml/genetic/GAGridCalculateFitnessTest.java
----------------------------------------------------------------------
diff --git 
a/modules/ml/src/test/java/org/apache/ignite/ml/genetic/GAGridCalculateFitnessTest.java
 
b/modules/ml/src/test/java/org/apache/ignite/ml/genetic/GAGridCalculateFitnessTest.java
index 979e1e4..d931260 100644
--- 
a/modules/ml/src/test/java/org/apache/ignite/ml/genetic/GAGridCalculateFitnessTest.java
+++ 
b/modules/ml/src/test/java/org/apache/ignite/ml/genetic/GAGridCalculateFitnessTest.java
@@ -27,12 +27,11 @@ import org.apache.ignite.cache.query.SqlFieldsQuery;
 import org.apache.ignite.ml.genetic.parameter.GAConfiguration;
 import org.apache.ignite.ml.genetic.parameter.GAGridConstants;
 import org.junit.After;
-
-import static org.junit.Assert.*;
-
 import org.junit.Before;
 import org.junit.Test;
 
+import static org.junit.Assert.assertEquals;
+
 /**
  * Calculate Fitness Test
  */

http://git-wip-us.apache.org/repos/asf/ignite/blob/9f5dd09b/modules/ml/src/test/java/org/apache/ignite/ml/genetic/GAGridInitializePopulationTest.java
----------------------------------------------------------------------
diff --git 
a/modules/ml/src/test/java/org/apache/ignite/ml/genetic/GAGridInitializePopulationTest.java
 
b/modules/ml/src/test/java/org/apache/ignite/ml/genetic/GAGridInitializePopulationTest.java
index 28b0196..168b2e8 100644
--- 
a/modules/ml/src/test/java/org/apache/ignite/ml/genetic/GAGridInitializePopulationTest.java
+++ 
b/modules/ml/src/test/java/org/apache/ignite/ml/genetic/GAGridInitializePopulationTest.java
@@ -27,12 +27,11 @@ import org.apache.ignite.cache.query.SqlFieldsQuery;
 import org.apache.ignite.ml.genetic.parameter.GAConfiguration;
 import org.apache.ignite.ml.genetic.parameter.GAGridConstants;
 import org.junit.After;
-
-import static org.junit.Assert.*;
-
 import org.junit.Before;
 import org.junit.Test;
 
+import static org.junit.Assert.assertEquals;
+
 /**
  * Initialize Gene and Chromosome Test
  */

http://git-wip-us.apache.org/repos/asf/ignite/blob/9f5dd09b/modules/ml/src/test/java/org/apache/ignite/ml/knn/KNNClassificationTest.java
----------------------------------------------------------------------
diff --git 
a/modules/ml/src/test/java/org/apache/ignite/ml/knn/KNNClassificationTest.java 
b/modules/ml/src/test/java/org/apache/ignite/ml/knn/KNNClassificationTest.java
index 569a887..ab1ecee 100644
--- 
a/modules/ml/src/test/java/org/apache/ignite/ml/knn/KNNClassificationTest.java
+++ 
b/modules/ml/src/test/java/org/apache/ignite/ml/knn/KNNClassificationTest.java
@@ -25,9 +25,9 @@ import java.util.Map;
 import org.apache.ignite.ml.knn.classification.KNNClassificationModel;
 import org.apache.ignite.ml.knn.classification.KNNClassificationTrainer;
 import org.apache.ignite.ml.knn.classification.KNNStrategy;
+import org.apache.ignite.ml.math.distances.EuclideanDistance;
 import org.apache.ignite.ml.math.primitives.vector.Vector;
 import org.apache.ignite.ml.math.primitives.vector.VectorUtils;
-import org.apache.ignite.ml.math.distances.EuclideanDistance;
 import org.apache.ignite.ml.math.primitives.vector.impl.DenseVector;
 import org.junit.Test;
 import org.junit.runner.RunWith;

http://git-wip-us.apache.org/repos/asf/ignite/blob/9f5dd09b/modules/ml/src/test/java/org/apache/ignite/ml/knn/KNNRegressionTest.java
----------------------------------------------------------------------
diff --git 
a/modules/ml/src/test/java/org/apache/ignite/ml/knn/KNNRegressionTest.java 
b/modules/ml/src/test/java/org/apache/ignite/ml/knn/KNNRegressionTest.java
index d02d72a..586e6c8 100644
--- a/modules/ml/src/test/java/org/apache/ignite/ml/knn/KNNRegressionTest.java
+++ b/modules/ml/src/test/java/org/apache/ignite/ml/knn/KNNRegressionTest.java
@@ -26,9 +26,9 @@ import 
org.apache.ignite.ml.dataset.impl.local.LocalDatasetBuilder;
 import org.apache.ignite.ml.knn.classification.KNNStrategy;
 import org.apache.ignite.ml.knn.regression.KNNRegressionModel;
 import org.apache.ignite.ml.knn.regression.KNNRegressionTrainer;
+import org.apache.ignite.ml.math.distances.EuclideanDistance;
 import org.apache.ignite.ml.math.primitives.vector.Vector;
 import org.apache.ignite.ml.math.primitives.vector.VectorUtils;
-import org.apache.ignite.ml.math.distances.EuclideanDistance;
 import org.apache.ignite.ml.math.primitives.vector.impl.DenseVector;
 import org.junit.Assert;
 import org.junit.Test;

http://git-wip-us.apache.org/repos/asf/ignite/blob/9f5dd09b/modules/ml/src/test/java/org/apache/ignite/ml/knn/LabeledDatasetTest.java
----------------------------------------------------------------------
diff --git 
a/modules/ml/src/test/java/org/apache/ignite/ml/knn/LabeledDatasetTest.java 
b/modules/ml/src/test/java/org/apache/ignite/ml/knn/LabeledDatasetTest.java
index 8ced650..a029e49 100644
--- a/modules/ml/src/test/java/org/apache/ignite/ml/knn/LabeledDatasetTest.java
+++ b/modules/ml/src/test/java/org/apache/ignite/ml/knn/LabeledDatasetTest.java
@@ -22,11 +22,11 @@ import java.net.URISyntaxException;
 import java.nio.file.Path;
 import java.nio.file.Paths;
 import org.apache.ignite.ml.math.ExternalizableTest;
-import org.apache.ignite.ml.math.primitives.vector.Vector;
 import org.apache.ignite.ml.math.exceptions.CardinalityException;
 import org.apache.ignite.ml.math.exceptions.NoDataException;
 import org.apache.ignite.ml.math.exceptions.knn.EmptyFileException;
 import org.apache.ignite.ml.math.exceptions.knn.FileParsingException;
+import org.apache.ignite.ml.math.primitives.vector.Vector;
 import org.apache.ignite.ml.structures.LabeledDataset;
 import org.apache.ignite.ml.structures.LabeledDatasetTestTrainPair;
 import org.apache.ignite.ml.structures.LabeledVector;

http://git-wip-us.apache.org/repos/asf/ignite/blob/9f5dd09b/modules/ml/src/test/java/org/apache/ignite/ml/math/BlasTest.java
----------------------------------------------------------------------
diff --git a/modules/ml/src/test/java/org/apache/ignite/ml/math/BlasTest.java 
b/modules/ml/src/test/java/org/apache/ignite/ml/math/BlasTest.java
index a5e47a4..61bde69 100644
--- a/modules/ml/src/test/java/org/apache/ignite/ml/math/BlasTest.java
+++ b/modules/ml/src/test/java/org/apache/ignite/ml/math/BlasTest.java
@@ -22,9 +22,9 @@ import java.util.function.BiPredicate;
 import org.apache.ignite.ml.math.primitives.matrix.Matrix;
 import org.apache.ignite.ml.math.primitives.matrix.impl.DenseMatrix;
 import org.apache.ignite.ml.math.primitives.matrix.impl.SparseMatrix;
+import org.apache.ignite.ml.math.primitives.vector.Vector;
 import org.apache.ignite.ml.math.primitives.vector.impl.DenseVector;
 import org.apache.ignite.ml.math.primitives.vector.impl.SparseVector;
-import org.apache.ignite.ml.math.primitives.vector.Vector;
 import org.junit.Assert;
 import org.junit.Test;
 

http://git-wip-us.apache.org/repos/asf/ignite/blob/9f5dd09b/modules/ml/src/test/java/org/apache/ignite/ml/math/MathImplLocalTestSuite.java
----------------------------------------------------------------------
diff --git 
a/modules/ml/src/test/java/org/apache/ignite/ml/math/MathImplLocalTestSuite.java
 
b/modules/ml/src/test/java/org/apache/ignite/ml/math/MathImplLocalTestSuite.java
index d917f61..b76a4c2 100644
--- 
a/modules/ml/src/test/java/org/apache/ignite/ml/math/MathImplLocalTestSuite.java
+++ 
b/modules/ml/src/test/java/org/apache/ignite/ml/math/MathImplLocalTestSuite.java
@@ -18,24 +18,24 @@
 package org.apache.ignite.ml.math;
 
 import org.apache.ignite.ml.math.distances.DistanceTest;
+import org.apache.ignite.ml.math.isolve.lsqr.LSQROnHeapTest;
 import org.apache.ignite.ml.math.primitives.matrix.DenseMatrixConstructorTest;
+import org.apache.ignite.ml.math.primitives.matrix.MatrixArrayStorageTest;
 import org.apache.ignite.ml.math.primitives.matrix.MatrixAttributeTest;
+import 
org.apache.ignite.ml.math.primitives.matrix.MatrixStorageImplementationTest;
 import org.apache.ignite.ml.math.primitives.matrix.MatrixViewConstructorTest;
 import org.apache.ignite.ml.math.primitives.matrix.SparseMatrixConstructorTest;
-import org.apache.ignite.ml.math.primitives.matrix.MatrixArrayStorageTest;
-import 
org.apache.ignite.ml.math.primitives.matrix.MatrixStorageImplementationTest;
-import org.apache.ignite.ml.math.primitives.vector.VectorArrayStorageTest;
 import org.apache.ignite.ml.math.primitives.vector.AbstractVectorTest;
 import 
org.apache.ignite.ml.math.primitives.vector.DelegatingVectorConstructorTest;
 import org.apache.ignite.ml.math.primitives.vector.DenseVectorConstructorTest;
 import org.apache.ignite.ml.math.primitives.vector.MatrixVectorViewTest;
 import org.apache.ignite.ml.math.primitives.vector.SparseVectorConstructorTest;
+import org.apache.ignite.ml.math.primitives.vector.VectorArrayStorageTest;
 import org.apache.ignite.ml.math.primitives.vector.VectorAttributesTest;
 import org.apache.ignite.ml.math.primitives.vector.VectorFoldMapTest;
 import org.apache.ignite.ml.math.primitives.vector.VectorNormTest;
 import org.apache.ignite.ml.math.primitives.vector.VectorToMatrixTest;
 import org.apache.ignite.ml.math.primitives.vector.VectorViewTest;
-import org.apache.ignite.ml.math.isolve.lsqr.LSQROnHeapTest;
 import org.junit.runner.RunWith;
 import org.junit.runners.Suite;
 

http://git-wip-us.apache.org/repos/asf/ignite/blob/9f5dd09b/modules/ml/src/test/java/org/apache/ignite/ml/math/TracerTest.java
----------------------------------------------------------------------
diff --git a/modules/ml/src/test/java/org/apache/ignite/ml/math/TracerTest.java 
b/modules/ml/src/test/java/org/apache/ignite/ml/math/TracerTest.java
index a164daf..1b78390d 100644
--- a/modules/ml/src/test/java/org/apache/ignite/ml/math/TracerTest.java
+++ b/modules/ml/src/test/java/org/apache/ignite/ml/math/TracerTest.java
@@ -27,8 +27,8 @@ import java.util.Optional;
 import org.apache.ignite.ml.math.primitives.MathTestConstants;
 import org.apache.ignite.ml.math.primitives.matrix.Matrix;
 import org.apache.ignite.ml.math.primitives.matrix.impl.DenseMatrix;
-import org.apache.ignite.ml.math.primitives.vector.impl.DenseVector;
 import org.apache.ignite.ml.math.primitives.vector.Vector;
+import org.apache.ignite.ml.math.primitives.vector.impl.DenseVector;
 import org.junit.Test;
 
 import static java.nio.file.Files.createTempFile;

http://git-wip-us.apache.org/repos/asf/ignite/blob/9f5dd09b/modules/ml/src/test/java/org/apache/ignite/ml/math/primitives/matrix/MatrixBaseStorageTest.java
----------------------------------------------------------------------
diff --git 
a/modules/ml/src/test/java/org/apache/ignite/ml/math/primitives/matrix/MatrixBaseStorageTest.java
 
b/modules/ml/src/test/java/org/apache/ignite/ml/math/primitives/matrix/MatrixBaseStorageTest.java
index d488ac9..499a457 100644
--- 
a/modules/ml/src/test/java/org/apache/ignite/ml/math/primitives/matrix/MatrixBaseStorageTest.java
+++ 
b/modules/ml/src/test/java/org/apache/ignite/ml/math/primitives/matrix/MatrixBaseStorageTest.java
@@ -18,7 +18,6 @@
 package org.apache.ignite.ml.math.primitives.matrix;
 
 import org.apache.ignite.ml.math.ExternalizeTest;
-import org.apache.ignite.ml.math.primitives.matrix.MatrixStorage;
 import org.apache.ignite.ml.math.primitives.MathTestConstants;
 import org.junit.After;
 import org.junit.Assert;

http://git-wip-us.apache.org/repos/asf/ignite/blob/9f5dd09b/modules/ml/src/test/java/org/apache/ignite/ml/math/primitives/matrix/MatrixStorageFixtures.java
----------------------------------------------------------------------
diff --git 
a/modules/ml/src/test/java/org/apache/ignite/ml/math/primitives/matrix/MatrixStorageFixtures.java
 
b/modules/ml/src/test/java/org/apache/ignite/ml/math/primitives/matrix/MatrixStorageFixtures.java
index 2674c0a..cadf9fe 100644
--- 
a/modules/ml/src/test/java/org/apache/ignite/ml/math/primitives/matrix/MatrixStorageFixtures.java
+++ 
b/modules/ml/src/test/java/org/apache/ignite/ml/math/primitives/matrix/MatrixStorageFixtures.java
@@ -23,7 +23,6 @@ import java.util.List;
 import java.util.NoSuchElementException;
 import java.util.function.BiConsumer;
 import java.util.function.Supplier;
-import org.apache.ignite.ml.math.primitives.matrix.MatrixStorage;
 import org.apache.ignite.ml.math.StorageConstants;
 import org.apache.ignite.ml.math.primitives.matrix.storage.SparseMatrixStorage;
 import org.jetbrains.annotations.NotNull;

http://git-wip-us.apache.org/repos/asf/ignite/blob/9f5dd09b/modules/ml/src/test/java/org/apache/ignite/ml/math/primitives/vector/AbstractVectorTest.java
----------------------------------------------------------------------
diff --git 
a/modules/ml/src/test/java/org/apache/ignite/ml/math/primitives/vector/AbstractVectorTest.java
 
b/modules/ml/src/test/java/org/apache/ignite/ml/math/primitives/vector/AbstractVectorTest.java
index 2550c6f..bfc9557 100644
--- 
a/modules/ml/src/test/java/org/apache/ignite/ml/math/primitives/vector/AbstractVectorTest.java
+++ 
b/modules/ml/src/test/java/org/apache/ignite/ml/math/primitives/vector/AbstractVectorTest.java
@@ -19,10 +19,10 @@ package org.apache.ignite.ml.math.primitives.vector;
 
 import java.util.Arrays;
 import java.util.stream.StreamSupport;
-import org.apache.ignite.ml.math.primitives.matrix.Matrix;
 import org.apache.ignite.ml.math.exceptions.IndexException;
 import org.apache.ignite.ml.math.functions.Functions;
 import org.apache.ignite.ml.math.primitives.MathTestConstants;
+import org.apache.ignite.ml.math.primitives.matrix.Matrix;
 import org.apache.ignite.ml.math.primitives.vector.storage.DenseVectorStorage;
 import org.junit.Assert;
 import org.junit.Before;

http://git-wip-us.apache.org/repos/asf/ignite/blob/9f5dd09b/modules/ml/src/test/java/org/apache/ignite/ml/math/primitives/vector/DelegatingVectorConstructorTest.java
----------------------------------------------------------------------
diff --git 
a/modules/ml/src/test/java/org/apache/ignite/ml/math/primitives/vector/DelegatingVectorConstructorTest.java
 
b/modules/ml/src/test/java/org/apache/ignite/ml/math/primitives/vector/DelegatingVectorConstructorTest.java
index f5033e3..6b44c38 100644
--- 
a/modules/ml/src/test/java/org/apache/ignite/ml/math/primitives/vector/DelegatingVectorConstructorTest.java
+++ 
b/modules/ml/src/test/java/org/apache/ignite/ml/math/primitives/vector/DelegatingVectorConstructorTest.java
@@ -17,8 +17,8 @@
 
 package org.apache.ignite.ml.math.primitives.vector;
 
-import org.apache.ignite.ml.math.primitives.vector.impl.DenseVector;
 import org.apache.ignite.ml.math.primitives.vector.impl.DelegatingVector;
+import org.apache.ignite.ml.math.primitives.vector.impl.DenseVector;
 import org.junit.Test;
 
 import static org.junit.Assert.assertEquals;

http://git-wip-us.apache.org/repos/asf/ignite/blob/9f5dd09b/modules/ml/src/test/java/org/apache/ignite/ml/math/primitives/vector/MatrixVectorViewTest.java
----------------------------------------------------------------------
diff --git 
a/modules/ml/src/test/java/org/apache/ignite/ml/math/primitives/vector/MatrixVectorViewTest.java
 
b/modules/ml/src/test/java/org/apache/ignite/ml/math/primitives/vector/MatrixVectorViewTest.java
index b978729..922a1ef 100644
--- 
a/modules/ml/src/test/java/org/apache/ignite/ml/math/primitives/vector/MatrixVectorViewTest.java
+++ 
b/modules/ml/src/test/java/org/apache/ignite/ml/math/primitives/vector/MatrixVectorViewTest.java
@@ -17,8 +17,8 @@
 
 package org.apache.ignite.ml.math.primitives.vector;
 
-import org.apache.ignite.ml.math.primitives.matrix.Matrix;
 import org.apache.ignite.ml.math.exceptions.IndexException;
+import org.apache.ignite.ml.math.primitives.matrix.Matrix;
 import org.apache.ignite.ml.math.primitives.matrix.impl.DenseMatrix;
 import org.apache.ignite.ml.math.primitives.vector.impl.VectorizedViewMatrix;
 import org.junit.Before;

http://git-wip-us.apache.org/repos/asf/ignite/blob/9f5dd09b/modules/ml/src/test/java/org/apache/ignite/ml/math/primitives/vector/VectorAttributesTest.java
----------------------------------------------------------------------
diff --git 
a/modules/ml/src/test/java/org/apache/ignite/ml/math/primitives/vector/VectorAttributesTest.java
 
b/modules/ml/src/test/java/org/apache/ignite/ml/math/primitives/vector/VectorAttributesTest.java
index 691eeb1..7f7b31c 100644
--- 
a/modules/ml/src/test/java/org/apache/ignite/ml/math/primitives/vector/VectorAttributesTest.java
+++ 
b/modules/ml/src/test/java/org/apache/ignite/ml/math/primitives/vector/VectorAttributesTest.java
@@ -21,9 +21,9 @@ import java.util.Arrays;
 import java.util.List;
 import java.util.function.Function;
 import org.apache.ignite.ml.math.primitives.matrix.impl.DenseMatrix;
+import org.apache.ignite.ml.math.primitives.vector.impl.DelegatingVector;
 import org.apache.ignite.ml.math.primitives.vector.impl.DenseVector;
 import org.apache.ignite.ml.math.primitives.vector.impl.SparseVector;
-import org.apache.ignite.ml.math.primitives.vector.impl.DelegatingVector;
 import org.apache.ignite.ml.math.primitives.vector.impl.VectorizedViewMatrix;
 import org.junit.Test;
 

http://git-wip-us.apache.org/repos/asf/ignite/blob/9f5dd09b/modules/ml/src/test/java/org/apache/ignite/ml/math/primitives/vector/VectorBaseStorageTest.java
----------------------------------------------------------------------
diff --git 
a/modules/ml/src/test/java/org/apache/ignite/ml/math/primitives/vector/VectorBaseStorageTest.java
 
b/modules/ml/src/test/java/org/apache/ignite/ml/math/primitives/vector/VectorBaseStorageTest.java
index b6c9721..64c93ac 100644
--- 
a/modules/ml/src/test/java/org/apache/ignite/ml/math/primitives/vector/VectorBaseStorageTest.java
+++ 
b/modules/ml/src/test/java/org/apache/ignite/ml/math/primitives/vector/VectorBaseStorageTest.java
@@ -18,7 +18,6 @@
 package org.apache.ignite.ml.math.primitives.vector;
 
 import org.apache.ignite.ml.math.ExternalizeTest;
-import org.apache.ignite.ml.math.primitives.vector.VectorStorage;
 import org.apache.ignite.ml.math.primitives.MathTestConstants;
 import org.junit.After;
 import org.junit.Before;

http://git-wip-us.apache.org/repos/asf/ignite/blob/9f5dd09b/modules/ml/src/test/java/org/apache/ignite/ml/math/primitives/vector/VectorImplementationsFixtures.java
----------------------------------------------------------------------
diff --git 
a/modules/ml/src/test/java/org/apache/ignite/ml/math/primitives/vector/VectorImplementationsFixtures.java
 
b/modules/ml/src/test/java/org/apache/ignite/ml/math/primitives/vector/VectorImplementationsFixtures.java
index 549a5f8..d87478b 100644
--- 
a/modules/ml/src/test/java/org/apache/ignite/ml/math/primitives/vector/VectorImplementationsFixtures.java
+++ 
b/modules/ml/src/test/java/org/apache/ignite/ml/math/primitives/vector/VectorImplementationsFixtures.java
@@ -29,12 +29,12 @@ import java.util.function.BiFunction;
 import java.util.function.Consumer;
 import java.util.function.Function;
 import java.util.function.Supplier;
-import org.apache.ignite.ml.math.primitives.matrix.Matrix;
 import org.apache.ignite.ml.math.StorageConstants;
+import org.apache.ignite.ml.math.primitives.matrix.Matrix;
 import org.apache.ignite.ml.math.primitives.matrix.impl.DenseMatrix;
+import org.apache.ignite.ml.math.primitives.vector.impl.DelegatingVector;
 import org.apache.ignite.ml.math.primitives.vector.impl.DenseVector;
 import org.apache.ignite.ml.math.primitives.vector.impl.SparseVector;
-import org.apache.ignite.ml.math.primitives.vector.impl.DelegatingVector;
 import org.apache.ignite.ml.math.primitives.vector.impl.VectorizedViewMatrix;
 import org.jetbrains.annotations.NotNull;
 

http://git-wip-us.apache.org/repos/asf/ignite/blob/9f5dd09b/modules/ml/src/test/java/org/apache/ignite/ml/math/primitives/vector/VectorImplementationsTest.java
----------------------------------------------------------------------
diff --git 
a/modules/ml/src/test/java/org/apache/ignite/ml/math/primitives/vector/VectorImplementationsTest.java
 
b/modules/ml/src/test/java/org/apache/ignite/ml/math/primitives/vector/VectorImplementationsTest.java
index 27fffb0..48e536e 100644
--- 
a/modules/ml/src/test/java/org/apache/ignite/ml/math/primitives/vector/VectorImplementationsTest.java
+++ 
b/modules/ml/src/test/java/org/apache/ignite/ml/math/primitives/vector/VectorImplementationsTest.java
@@ -27,9 +27,9 @@ import org.apache.ignite.IgniteException;
 import org.apache.ignite.ml.math.ExternalizeTest;
 import org.apache.ignite.ml.math.exceptions.CardinalityException;
 import org.apache.ignite.ml.math.exceptions.UnsupportedOperationException;
+import org.apache.ignite.ml.math.primitives.vector.impl.DelegatingVector;
 import org.apache.ignite.ml.math.primitives.vector.impl.DenseVector;
 import org.apache.ignite.ml.math.primitives.vector.impl.SparseVector;
-import org.apache.ignite.ml.math.primitives.vector.impl.DelegatingVector;
 import org.apache.ignite.ml.math.primitives.vector.impl.VectorizedViewMatrix;
 import org.junit.Assert;
 import org.junit.Test;

http://git-wip-us.apache.org/repos/asf/ignite/blob/9f5dd09b/modules/ml/src/test/java/org/apache/ignite/ml/math/primitives/vector/VectorToMatrixTest.java
----------------------------------------------------------------------
diff --git 
a/modules/ml/src/test/java/org/apache/ignite/ml/math/primitives/vector/VectorToMatrixTest.java
 
b/modules/ml/src/test/java/org/apache/ignite/ml/math/primitives/vector/VectorToMatrixTest.java
index 09733b8..01ab049 100644
--- 
a/modules/ml/src/test/java/org/apache/ignite/ml/math/primitives/vector/VectorToMatrixTest.java
+++ 
b/modules/ml/src/test/java/org/apache/ignite/ml/math/primitives/vector/VectorToMatrixTest.java
@@ -22,10 +22,10 @@ import java.util.Map;
 import java.util.function.BiConsumer;
 import org.apache.ignite.ml.math.primitives.matrix.Matrix;
 import org.apache.ignite.ml.math.primitives.matrix.impl.DenseMatrix;
-import org.apache.ignite.ml.math.primitives.vector.impl.DenseVector;
 import org.apache.ignite.ml.math.primitives.matrix.impl.SparseMatrix;
-import org.apache.ignite.ml.math.primitives.vector.impl.SparseVector;
 import org.apache.ignite.ml.math.primitives.vector.impl.DelegatingVector;
+import org.apache.ignite.ml.math.primitives.vector.impl.DenseVector;
+import org.apache.ignite.ml.math.primitives.vector.impl.SparseVector;
 import org.apache.ignite.ml.math.primitives.vector.impl.VectorizedViewMatrix;
 import org.junit.Test;
 

http://git-wip-us.apache.org/repos/asf/ignite/blob/9f5dd09b/modules/ml/src/test/java/org/apache/ignite/ml/nn/MLPTest.java
----------------------------------------------------------------------
diff --git a/modules/ml/src/test/java/org/apache/ignite/ml/nn/MLPTest.java 
b/modules/ml/src/test/java/org/apache/ignite/ml/nn/MLPTest.java
index 5c09e43..51620b7 100644
--- a/modules/ml/src/test/java/org/apache/ignite/ml/nn/MLPTest.java
+++ b/modules/ml/src/test/java/org/apache/ignite/ml/nn/MLPTest.java
@@ -18,11 +18,11 @@
 package org.apache.ignite.ml.nn;
 
 import org.apache.ignite.ml.TestUtils;
-import org.apache.ignite.ml.math.primitives.matrix.Matrix;
 import org.apache.ignite.ml.math.Tracer;
-import org.apache.ignite.ml.math.primitives.vector.Vector;
 import org.apache.ignite.ml.math.functions.IgniteTriFunction;
+import org.apache.ignite.ml.math.primitives.matrix.Matrix;
 import org.apache.ignite.ml.math.primitives.matrix.impl.DenseMatrix;
+import org.apache.ignite.ml.math.primitives.vector.Vector;
 import org.apache.ignite.ml.math.primitives.vector.impl.DenseVector;
 import org.apache.ignite.ml.nn.architecture.MLPArchitecture;
 import org.apache.ignite.ml.optimization.LossFunctions;

Reply via email to