Github user akopich commented on the pull request: https://github.com/apache/spark/pull/1269#issuecomment-67643630 I've performed sanity check on the dataset i've described above. PLSA: tm project obtains perplexity of `2358` and this implementation ends up with `2311`. RobustPLSA: `1871` and `1466` respectively. Seems to be sane.
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