org.apache.sysml.runtime.matrix.mapred.MMCJMRCombiner Maven / Gradle / Ivy

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Declarative Machine Learning

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/*
 * 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.sysml.runtime.matrix.mapred;

import java.io.IOException;
import java.util.Iterator;

import org.apache.hadoop.mapred.JobConf;
import org.apache.hadoop.mapred.OutputCollector;
import org.apache.hadoop.mapred.Reducer;
import org.apache.hadoop.mapred.Reporter;

import org.apache.sysml.runtime.matrix.data.MatrixValue;
import org.apache.sysml.runtime.matrix.data.TaggedFirstSecondIndexes;


public class MMCJMRCombiner extends MMCJMRCombinerReducerBase 
implements Reducer
{

	public void reduce(TaggedFirstSecondIndexes indexes, Iterator values,
			OutputCollector out,
			Reporter report) throws IOException {
	
		//perform aggregate
		MatrixValue aggregateValue=performAggregateInstructions(indexes, values);
		
		if(aggregateValue!=null)
			out.collect(indexes, aggregateValue);
		
	}
	
	public void configure(JobConf job)
	{
		super.configure(job);
	}
}