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From s..@apache.org
Subject svn commit: r1508447 - /mahout/trunk/core/src/main/java/org/apache/mahout/common/mapreduce/VectorSumCombiner.java
Date Tue, 30 Jul 2013 13:59:45 GMT
Author: ssc
Date: Tue Jul 30 13:59:45 2013
New Revision: 1508447

URL: http://svn.apache.org/r1508447
Log:
MAHOUT-1289 Move downsampling code into RowSimilarityJob

Added:
    mahout/trunk/core/src/main/java/org/apache/mahout/common/mapreduce/VectorSumCombiner.java

Added: mahout/trunk/core/src/main/java/org/apache/mahout/common/mapreduce/VectorSumCombiner.java
URL: http://svn.apache.org/viewvc/mahout/trunk/core/src/main/java/org/apache/mahout/common/mapreduce/VectorSumCombiner.java?rev=1508447&view=auto
==============================================================================
--- mahout/trunk/core/src/main/java/org/apache/mahout/common/mapreduce/VectorSumCombiner.java
(added)
+++ mahout/trunk/core/src/main/java/org/apache/mahout/common/mapreduce/VectorSumCombiner.java
Tue Jul 30 13:59:45 2013
@@ -0,0 +1,38 @@
+/**
+ * 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.common.mapreduce;
+
+import org.apache.hadoop.io.WritableComparable;
+import org.apache.hadoop.mapreduce.Reducer;
+import org.apache.mahout.math.VectorWritable;
+import org.apache.mahout.math.hadoop.similarity.cooccurrence.Vectors;
+
+import java.io.IOException;
+
+public class VectorSumCombiner
+      extends Reducer<WritableComparable<?>, VectorWritable, WritableComparable<?>,
VectorWritable> {
+
+    private final VectorWritable result = new VectorWritable();
+
+    @Override
+    protected void reduce(WritableComparable<?> key, Iterable<VectorWritable>
values, Context ctx)
+      throws IOException, InterruptedException {
+      result.set(Vectors.sum(values.iterator()));
+      ctx.write(key, result);
+    }
+  }
\ No newline at end of file



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