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Posted to dev@mahout.apache.org by "lariven (JIRA)" <ji...@apache.org> on 2015/06/12 16:50:00 UTC
[jira] [Created] (MAHOUT-1739) maxSimilarItemsPerItem param doesn't
behave correct
lariven created MAHOUT-1739:
-------------------------------
Summary: maxSimilarItemsPerItem param 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
maxSimilarItemsPerItem may exceed the number of similar items we set to this 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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