Github user mengxr commented on the pull request:
https://github.com/apache/spark/pull/2634#issuecomment-70588270
@derrickburns We use dense vectors to store cluster centers, because the
centers are very likely to become dense during aggregation. If there are zeros,
they can be efficiently compressed before sending back to the driver. For
performance, we never add two sparse vectors together. I'm not sure whether
this answers your question.
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