Github user witgo commented on the pull request:
https://github.com/apache/spark/pull/4047#issuecomment-70030602
There are two questions.
1. How to cover the long tail topic features
2. The algorithm performance in 10K -100K topic
Here is a relevant industrial practice:
"[Peacock: Learning Long-Tail Topic Features for Industrial
Applications](http://arxiv.org/abs/1405.4402)"
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