Github user srowen commented on the issue:
https://github.com/apache/spark/pull/18797
The only number that is <= Double.PositiveInfinity is Double.NaN, because
it has no ordering at all with respect to anything. So init must be NaN somehow.
It's called from LBFGS in Breeze, where the value is `if(state.iter == 0.0)
1.0/norm(dir) else 1.0`, that should only happen if norm(dir) is NaN, which
should only happen if the dir vector has a NaN element. And then so on, but I'm
not seeing how the arguments from the Spark code cause this. The initial params
are all 0.
It might still be a Breeze issue that's just now uncovered, but, haven't
proven that yet.
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