Github user avulanov commented on the pull request:
https://github.com/apache/spark/pull/1379#issuecomment-68741897
@dbtsai
Just back from vacation too:)
I used my old implementation of the matrix form of back propagation and
made sure that it properly uses stride of matrices in breeze. Also, I optimized
roll of parameters into vector combined with in-place update of cumulative sum.
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