Github user jkbradley commented on the pull request:
https://github.com/apache/spark/pull/5467#issuecomment-92519784
Yep, that's pretty much what I had in mind, except that I'd recommend:
* using MLlib's local Matrix type (and its BLAS call in mllib.linalg.BLAS)
* computing and storing the Matrix once during initialization
* In this case, we should store a matching Array of Strings so that
```getVectors``` can be computed (rather than storing duplicate info)
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