Github user nzw0301 commented on the issue:
https://github.com/apache/spark/pull/19372
Thank you for your comment, @LowikC.
You are right, my PR code is incorrect.
Correct update formula is
```scala
alpha = learningRate *
(1 - numPartitions * wordCount.toDouble + (k - 1) * trainWordsCount /
(numIterations * trainWordsCount + 1))
```
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