Github user srowen commented on the pull request:
https://github.com/apache/spark/pull/1425#issuecomment-49713754
Is it possible to support syntax like `0.3 +- 0.1` for absolute error, and
`0.3 +- 10%` for relative error? Seems like the kind of crazy thing that Scala
just might support. Maybe it's a nice way to support both semantics; I think
relative error semantics have to be a separate method anwayy.
Also, there is the method `Math.ulp`
(http://docs.oracle.com/javase/7/docs/api/java/lang/Math.html#ulp(double))
whichs tell you how big the gap is between floating-point values around a given
value. How about using this to pick a reasonable absolute error around the
test's expected value? At least it scales automatically.
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