Github user mengxr commented on the pull request:
https://github.com/apache/spark/pull/1425#issuecomment-49808612
@srowen `+- 10%` is not very practical because we usually need `+-
0.000000000001%`. For most numerical computation, the switching point is `1.0`.
Above `1.0`, use relative error or absolute error otherwise. Because of `1.0`,
this is a smooth change.
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