Github user jkbradley commented on the pull request:
https://github.com/apache/spark/pull/3221#issuecomment-91069400
@debasish83 Including sparsity for both recommendation and for topic
modeling will be useful, to be sure. We don't have perplexity (or even
prediction) implemented yet, but that definitely needs to be done for LDA. New
JIRA: [https://issues.apache.org/jira/browse/SPARK-6793]
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