Github user debasish83 commented on the pull request:
https://github.com/apache/spark/pull/1290#issuecomment-82756880
I am not sure how to write Figure 1 using matrix but using graphx the
gradient calculation is just a forward backward pass on the distributed
graph...Also I think it is easier to add more layers using graphx...making the
graph balanced is a issue but the matrix alternative is not very clear to me...
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