向MapReduce转换：计算共现关系

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<strong><span style="font-size:18px;">/**** @author YangXin* @info 计算共现关系的Mapper*/
package unitSix;import java.io.IOException;
import java.util.Iterator;import org.apache.hadoop.io.IntWritable;
import org.apache.hadoop.mapreduce.Mapper;
import org.apache.mahout.math.VarLongWritable;
import org.apache.mahout.math.Vector;
import org.apache.mahout.math.VectorWritable;public class UserVectorToCooccurrenceMapper extends Mapper<VarLongWritable, VectorWritable, IntWritable, IntWritable>{public void map(VarLongWritable userID, VectorWritable userVector, Context context) throws IOException, InterruptedException{Iterator<Vector.Element> it = userVector.get().nonZeroes().iterator();//双重循环遍历非零元素while(it.hasNext()){int index1 = it.next().index();Iterator<Vector.Element> it2 = userVector.get().

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