错误的值类：org.apache.mahout.math.VarLongWritable不是类org.apache.mahout.math.VectorWritable

作者: 一只特立独行的猪
发布时间: 2023-12-11 10:45:17 (6月前)
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妖邪 | 2019-08-31 10-32

<div class =“post-text”itemprop =“text”> <P> 问题出在Reducer功能中。减速器（......）应该减少，这意味着： </p> <pre> <code> public class FileToUserVectorReducer extends Reducer<VarLongWritable, VarLongWritable, VarLongWritable, VectorWritable> { @Override public void reduce(VarLongWritable userID, Iterable<VarLongWritable> itemPrefs, Context context) throws IOException, InterruptedException{ Vector userVector = new RandomAccessSparseVector(Integer.MAX_VALUE, 100); for(VarLongWritable itemPref : itemPrefs){ userVector.set((int)itemPref.get(), 1.0f); } context.write(userID, new VectorWritable(userVector)); } } </code> </pre> <P> @Override非常有帮助。如果我使用@Override，它会在编译时给出错误消息。我认为一开始没必要，但这种经验证明了它的价值。 </p> </DIV>

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