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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 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.clustering.fuzzykmeans;
import  org.apache.hadoop.mapred.JobConf;
import  org.apache.hadoop.mapred.MapReduceBase;
import  org.apache.hadoop.mapred.OutputCollector;
import  org.apache.hadoop.mapred.Reducer;
import  org.apache.hadoop.mapred.Reporter;
public class FuzzyKMeansCombiner extends MapReduceBase implements
    Reducer<Text, FuzzyKMeansInfo, Text, FuzzyKMeansInfo> {
  public void reduce(Text keyIterator<FuzzyKMeansInfovalues,
                     OutputCollector<Text, FuzzyKMeansInfooutput, Reporter reporterthrows IOException {
    SoftCluster cluster = new SoftCluster(key.toString().trim());
    while (values.hasNext()) {
      //String pointInfo =;
      FuzzyKMeansInfo info =;
      if (info.getCombinerPass() == 0) // first time thru combiner
        cluster.addPoint(info.getVector(), Math.pow(info.getProbability(), SoftCluster.getM()));
      } else {
        cluster.addPoints(info.getVector(), info.getProbability());
      info.setCombinerPass(info.getCombinerPass() + 1);
    //TODO: how do we pass along the combinerPass?  Or do we not need to?
    output.collect(keynew FuzzyKMeansInfo(cluster.getPointProbSum(), cluster.getWeightedPointTotal(), 1));
  public void configure(JobConf job) {
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