Github user techaddict commented on the pull request:
https://github.com/apache/spark/pull/597#issuecomment-42404618
@mengxr Here are few results
```
implicitPref rank numInterations lambda -> rmse
true 10 20 1.0 -> 0.5985187619423589
true 20 20 1.0 -> 0.5822212152847526
true 30 20 1.0 -> 0.5780589497218527
true 30 40 1.0 -> 0.5776665087027969
true 30 40 0.1 -> 0.5768531690541231
true 30 40 0.001 -> 0.5756156814748565
```
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