## Package org.apache.mahout.cf.taste.hadoop.similarity.item

Class Summary
CountUsersKeyWritable: a writable key that is used by `CountUsersMapper` and `CountUsersReducer` to count unique users by sending all userIDs to the same reducer and have them sorted in ascending order so that there's no buffering necessary when counting them
CountUsersKeyWritable.CountUsersGroupComparator: all userIDs go to the same reducer
CountUsersKeyWritable.CountUsersPartitioner: all userIDs go to the same partition
CountUsersMapper: Maps out the userIDs in a way that we can use a secondary sort on them
CountUsersReducer: counts all unique users, we ensure that we see userIDs sorted in ascending order via secondary sort, so we don't have to buffer all of them
ItemSimilarityJob: Distributed precomputation of the item-item-similarities for Itembased Collaborative Filtering
MostSimilarItemPairsMapper
MostSimilarItemPairsReducer
ToItemVectorsReducer

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