Github user jkbradley commented on the pull request:
https://github.com/apache/spark/pull/8042#issuecomment-129565003
> To start the discussion; should a SparseMatrix and a DenseMatrix be equal
if they contain the same underlying content (i.e. do we define == as equality
in semantics or as equality in representation)?
If we follow Breeze's example, then we should define equality in semantics,
not representation. I think this PR is valid.
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