Github user dbtsai commented on the pull request:
https://github.com/apache/spark/pull/9843#issuecomment-160255311
With `minDocFreq`, the idf vector will result lots of zeros, which means
looping through each of elements in idf vector is not efficient. Also, with
lots of zeros in idf vector, even the input vector is dense, the transformed
result will be sparse. This PR doesn't address this issue. Let's make thing
right in one PR.
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