Github user dbtsai commented on the pull request:
https://github.com/apache/spark/pull/1425#issuecomment-49803403
I also noticed that it will be suffering when comparing against 0.0. As
@srowen pointed out, it's meaningless to comparing against 0.0 (or a really
small number) with relative error. However, people may just want to write
unittest using relative error for even comparing those small numbers. So I
purpose the following APIs.
`a ~== b +- eps` for relative error, and when a or b near zero, let's say
1e-15, it falls back to absolute error.
`a === b +- eps` which is already in scalatest 2.0 for absolute error, but
since we don't use scalatest 2.0 yet, we build the same APIs in mllib for
absolute error.
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