Github user srowen commented on the issue:
https://github.com/apache/spark/pull/15293
Yes that's the definition, but for y = +/- 1. The expression can't be
correct for y = 0/1; when y = 0 the loss is always 1 for example.
Well, I'm looking at what the equivalent is like for 0,1 and it's more
complicated really in all cases. It wouldn't match the comments in the source
code either. Maybe it is actually better to just move the note, yeah.
@dbtsai what do you think?
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