Github user MechCoder commented on the pull request:
https://github.com/apache/spark/pull/4459#issuecomment-73667895
@mengxr Just to make it easier for you, a small description.
GaussianMixture used to support sparse input, by converting it to DenseVectors,
which is non-optimal, in case of a large number of zeros. This PR makes sure
that the model works without this conversion happening.
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