Github user feynmanliang commented on the pull request:
https://github.com/apache/spark/pull/7454#issuecomment-123414657
Ran some local perf tests. Before PR:
```
bin/run-example mllib.LDAExample docs/*.md --maxIterations 100 --algorithm
online --vocabSize 100 --k 3
```
Training Time (sec) |
------------|
5.737|
5.510|
5.718|
```
bin/run-example mllib.LDAExample docs/*.md --maxIterations 100 --algorithm
online --vocabSize 100 --k 20
```
Training Time (sec) |
------------|
7.020|
6.977|
7.485|
After PR:
```
bin/run-example mllib.LDAExample docs/*.md --maxIterations 100 --algorithm
online --vocabSize 100 --k 3
```
Training Time (sec) |
------------|
4.870|
4.671|
4.689|
```
bin/run-example mllib.LDAExample docs/*.md --maxIterations 100 --algorithm
online --vocabSize 100 --k 20
```
Training Time (sec) |
------------|
6.311|
6.564|
6.088|
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