Distributed item similarity functions
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Key: MAHOUT-393
URL: https://issues.apache.org/jira/browse/MAHOUT-393
Project: Mahout
Issue Type: Improvement
Components: Collaborative Filtering
Reporter: Sebastian Schelter
To complete the work started in MAHOUT-389, I've created a distributed version
of any item similarity function that is currently already available in a
non-distributed manner. An additional M/R job was necessary to compute the
number of all users which is needed by some similarity functions (like
LogLikelihoodSimilarity for example).
There is still some optimization potential in the code as not every similarity
function needs all information that is currently extracted (like the number of
users e.g.), but the optimization would have made the code much less readable
so I did not do any work on that.
I hope you consider this a useful addition.
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