Github user dbtsai commented on the pull request:
https://github.com/apache/spark/pull/7884#issuecomment-140190915
@jkbradley For `count`, let's do it later since it's a private API.
Currently, `count` will return the actual number of instances, and ignores
instance weights, but `numNonzeros` will return the weighted # of nonzeros.
Let's decide the behavior of them, and modify them accordingly.
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