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https://issues.apache.org/jira/browse/MAHOUT-1500?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14081111#comment-14081111
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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_r15654554
--- Diff: h2o/src/main/java/org/apache/mahout/h2obindings/ops/AtB.java ---
@@ -0,0 +1,66 @@
+/*
+ * 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.h2obindings.H2OHelper;
+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;
+
+public class AtB {
+ /* Calculate A'B */
+ public static H2ODrm AtB(H2ODrm DrmA, H2ODrm DrmB) {
+ final Frame A = DrmA.frame;
+ final Frame B = DrmB.frame;
+
+ /* First create an empty frame of the required dimensions */
+ Frame AtB = H2OHelper.empty_frame(A.numCols(), B.numCols(), -1, -1);
+
+ /* Execute MRTask on the new Frame, and fill each cell (initially 0) by
+ computing appropriate values from A and B.
+
+ chks.length == B.numCols()
+ */
+ new MRTask() {
+ public void map(Chunk chks[]) {
+ int chunk_size = chks[0].len();
+ long start = chks[0].start();
+ long A_rows = A.numRows();
+ Vec A_vecs[] = A.vecs();
+ Vec B_vecs[] = B.vecs();
+
+ for (int c = 0; c < chks.length; c++) {
+ for (int r = 0; r < chunk_size; r++) {
+ double v = 0;
+ for (long i = 0; i < A_rows; i++) {
+ v += (A_vecs[(int)(start+r)].at(i) * B_vecs[c].at(i));
--- End diff --
Here and elsewhere. Operator spacing style. please use autoformatting
features in idea.
> 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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