Github user viirya commented on the pull request:
https://github.com/apache/spark/pull/4429#issuecomment-73340579
`weightMatrix` is just the broadcasted variable of the local copy of
original `weights`. It is used because we don't want to serialize whole model
but just the weights.
For the compilation error, when I run the test, the compiler complains
something like Object can't compare to Int.
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