Github user jkbradley commented on the pull request:
https://github.com/apache/spark/pull/1269#issuecomment-67414223
@akopich I don't think you need to add the tm project to Spark, but a
comparison of perplexity would be a good sanity check. Other implementations
might be better for scaling tests, such as
* [this GraphX implementation of LDA using
EM](https://github.com/dlwh/spark/compare/feature/lda) or
* [this other PR with an implementation of LDA using Gibbs
sampling](https://github.com/apache/spark/pull/2388)
Those tests failure look unrelated.
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