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https://issues.apache.org/jira/browse/MAHOUT-358?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12854413#action_12854413
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Hui Wen Han commented on MAHOUT-358:
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the simple way to resolve the issue is that construct the output in
RecommenderMapper and not use custom writable
private final Text user = new Text();
private final Text recomScore = new Text();
StringBuilder result = new StringBuilder(200);
result.append('[');
boolean first = true;
for (RecommendedItem item : recommendations) {
if (first) { first = false; }
else { result.append(','); }
result.append(item.getItemID());
result.append(':');
result.append(item.getValue());
}
result.append(']');
user.set(String.valueOf(userID));
recomScore.set(result.toString);
output.collect(userID, recomScore);
> 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: 20100407_steer_item_out_part-00000,
> attempt_201004011623_0070_m_000000_0.htm, 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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