Github user mengxr commented on the pull request:
https://github.com/apache/spark/pull/6556#issuecomment-107719469
The Java unit test is the same as the Scala unit test, but the example code
in the user guide is different. I thought about this difference. One reason is
that the unit test is for API coverage while the example code is for hands-on.
So it would be too much if we show, e.g., both sparse vectors and dense vectors
in the example code. But it would be nice to have some level of similarity.
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