Github user martinjaggi commented on the pull request:
https://github.com/apache/incubator-spark/pull/575#issuecomment-35218573
@fommil No matrix operations are performed at all so far, only vector
addition (of type dense += sparse). See the code in this PR by @mengxr . Vector
operations are enough for clustering, classification and regression as
currently in MLlib. I was referring to the k-Means benchmark posted in the JIRA.
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