Github user jkbradley commented on the pull request:
https://github.com/apache/spark/pull/4047#issuecomment-72292465
Here are partial results (from a test which is still running) on a
Wikipedia dump.
Training set size: 4072243 documents
Vocabulary size: 9869422 terms
Training set size: 1041734290 tokens
Preprocessing time: 247.831375878 sec
100 topics
16 EC2 r3.2xlarge workers
You can see the times for the first few iterations in the image.
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