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https://issues.apache.org/jira/browse/MAHOUT-1500?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14081112#comment-14081112
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ASF GitHub Bot commented on MAHOUT-1500:
----------------------------------------
Github user dlyubimov commented on a diff in the pull request:
https://github.com/apache/mahout/pull/21#discussion_r15654625
--- Diff: h2o/src/main/java/org/apache/mahout/h2obindings/ops/Atx.java ---
@@ -0,0 +1,76 @@
+/*
+ * 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.mahout.h2obindings.ops;
+
+import org.apache.mahout.math.Vector;
+import org.apache.mahout.math.DenseVector;
+import org.apache.mahout.math.Matrix;
+import org.apache.mahout.math.DenseMatrix;
+import org.apache.mahout.h2obindings.H2OHelper;
+import org.apache.mahout.h2obindings.drm.H2OBCast;
+import org.apache.mahout.h2obindings.drm.H2ODrm;
+
+import water.MRTask;
+import water.fvec.Frame;
+import water.fvec.Vec;
+import water.fvec.Chunk;
+import water.fvec.NewChunk;
+import water.util.ArrayUtils;
+
+public class Atx {
+ /* Calculate A'x (where x is an in-core Vector) */
+ public static H2ODrm Atx(H2ODrm DrmA, Vector x) {
+ Frame A = DrmA.frame;
+ final H2OBCast<Vector> bx = new H2OBCast<Vector>(x);
+
+ /* A'x is computed into _atx[] with an MRTask on A (with
+ x available as a Broadcast
+
+ x.size() == A.numRows()
+ _atx.length == chks.length == A.numCols()
+ */
+ class MRTaskAtx extends MRTask<MRTaskAtx> {
+ double _atx[];
--- End diff --
Mahout doesn't use underline prefixes for class attributes. We follow
standard Sun style conventions as far as java code is concerned.
> H2O integration
> ---------------
>
> Key: MAHOUT-1500
> URL: https://issues.apache.org/jira/browse/MAHOUT-1500
> Project: Mahout
> Issue Type: Improvement
> Reporter: Anand Avati
> Fix For: 1.0
>
>
> Provide H2O backend for the Mahout DSL
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