Limit the number of similar items per item in the ItemSimilarityJob
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Key: MAHOUT-407
URL: https://issues.apache.org/jira/browse/MAHOUT-407
Project: Mahout
Issue Type: New Feature
Components: Collaborative Filtering
Reporter: Sebastian Schelter
In order to keep the item-similarity-matrix sparse, it would be a useful
improvement to add an option like "maxSimilaritiesPerItem" to
o.a.m.cf.taste.hadoop.similarity.item.ItemSimilarityJob, which would make it
try to cap the number of similar items per item.
However as we store each similarity pair only once it could happen that there
are more than "maxSimilaritiesPerItem" similar items for a single item as we
can't drop some of the pairs because the other item in the pair might have too
little similarities otherwise.
A default value of 100 co-occurrences (similarities) will be used because this
is already the default in the distributed recommender.
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