Github user wangmiao1981 commented on the issue:
https://github.com/apache/spark/pull/16784
@jkbradley I simplified the test cases and modified the data generation API
using to toSparse method, which eliminates the index variable.
"Is this multivariate online summarizer issue really a bug? Or is it from
passing in sparse vectors which are 10x longer than the dense vectors?"
I think it is not a bug, which is due to the different sizes between dense
and sparse vectors. It means that we can't mix using the two together.
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