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https://issues.apache.org/jira/browse/MAHOUT-1739?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14584998#comment-14584998
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lariven edited comment on MAHOUT-1739 at 6/14/15 9:12 AM:
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Could you show me where it is used? I can't find any where else in mahout also
use this Job except RecommenderJob, which just run the ItemSimilarityJob and
output it's output while use the RowSimilarity's output as multipy input.
Don't know if spark-itemsimilariy also output triangular matrix, I'll try it.
was (Author: lariven):
Could you show me where it is used? I can't find any where else in mahout also
use this Job except RecommenderJob, which just run the ItemSimilarityJob and
output it's output while use the RowSimilarity's output as multipy input.
> maxSimilarItemsPerItem param of ItemSimilarityJob doesn't behave correct
> ------------------------------------------------------------------------
>
> Key: MAHOUT-1739
> URL: https://issues.apache.org/jira/browse/MAHOUT-1739
> Project: Mahout
> Issue Type: Bug
> Components: Collaborative Filtering
> Affects Versions: 0.10.0
> Reporter: lariven
> Labels: easyfix, patch
> Attachments: fix_maxSimilarItemsPerItem_incorrect_behave.patch
>
>
> the output similar items of ItemSimilarityJob for each target item may exceed
> the number of similar items we set to maxSimilarItemsPerItem parameter. the
> following code of ItemSimilarityJob.java about line NO. 200 may affect:
> if (itemID < otherItemID) {
> ctx.write(new EntityEntityWritable(itemID, otherItemID), new
> DoubleWritable(similarItem.getSimilarity()));
> } else {
> ctx.write(new EntityEntityWritable(otherItemID, itemID), new
> DoubleWritable(similarItem.getSimilarity()));
> }
> Don't know why need to switch itemID with otherItemID, but I think a single
> line is enough:
> ctx.write(new EntityEntityWritable(itemID, otherItemID), new
> DoubleWritable(similarItem.getSimilarity()));
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