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https://issues.apache.org/jira/browse/MAHOUT-358?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12854073#action_12854073
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Hui Wen Han commented on MAHOUT-358:
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if use Text as the out format ,everything is ok.
maybe something is wrong with RecommendedItemsWritable or IdentityReducer.
public final class RecommenderMapper extends MapReduceBase implements
Mapper<LongWritable,VectorWritable,Text,Text>
private final Text user = new Text();
private final Text recomScore = new Text();
private static final String FIELD_SEPERATOR = ",";
//output.collect(userID, new RecommendedItemsWritable(recommendations));
for (RecommendedItem recommendation : recommendations)
{
user.set(String.valueOf(userID));
recomScore.set(recommendation.getItemID() + FIELD_SEPERATOR +
recommendation.getValue());
output.collect(user, recomScore);
}
JobConf recommenderConf = prepareJobConf(userVectorPath, outputPath,
SequenceFileInputFormat.class, RecommenderMapper.class, Text.class,
Text.class, IdentityReducer.class, Text.class,
Text.class, TextOutputFormat.class);
> the pref value field of output of
> org.apache.mahout.cf.taste.hadoop.item.RecommenderJob has negative
> -----------------------------------------------------------------------------------------------------
>
> Key: MAHOUT-358
> URL: https://issues.apache.org/jira/browse/MAHOUT-358
> Project: Mahout
> Issue Type: Test
> Components: Collaborative Filtering
> Affects Versions: 0.4
> Reporter: Hui Wen Han
> Attachments: screenshot-1.jpg, screenshot-2.jpg
>
>
> In my test the input pref values all is positive.
> the output score value has negative value ,
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