/**
* 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.ga.watchmaker.cd.hadoop;
import java.io.IOException;
import org.apache.hadoop.io.LongWritable;
import org.apache.hadoop.mapreduce.Reducer;
import org.apache.mahout.ga.watchmaker.cd.CDFitness;
/**
* Hadoop Reducer, combines many evaluations (CDFitness) into a single one.
*/
public class CDReducer extends Reducer<LongWritable, CDFitness, LongWritable, CDFitness> {
@Override
protected void reduce(LongWritable key,
Iterable<CDFitness> values,
Context context) throws IOException, InterruptedException {
int tp = 0;
int fp = 0;
int tn = 0;
int fn = 0;
for (CDFitness v : values) {
tp += v.getTp();
fp += v.getFp();
tn += v.getTn();
fn += v.getFn();
}
context.write(key, new CDFitness(tp, fp, tn, fn));
}
}