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https://issues.apache.org/jira/browse/MAHOUT-358?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12854077#action_12854077
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Sean Owen commented on MAHOUT-358:
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You mean that you do not see those negative values? Truly strange, since that
means everything's working except output?
The output is simple:
@Override
public String toString() {
StringBuilder result = new StringBuilder(200);
result.append('[');
boolean first = true;
for (RecommendedItem item : recommended) {
if (first) {
first = false;
} else {
result.append(',');
}
result.append(item.getItemID());
result.append(':');
BigDecimal bd = new BigDecimal(item.getValue()).round(ROUNDING);
result.append(bd.toPlainString());
}
result.append(']');
return result.toString();
}
I can remove the BigDecimal call, which is somewhat new, but still looks
entirely correct to me.
Are you sure the output is really different?
> 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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