Github user srowen commented on the issue:
https://github.com/apache/spark/pull/14643
If it's OK, I'll open a different PR which proposes a simpler behavior:
- Return the class with highest probability that is also >= threshold
- If no such class exists, return ... NaN? This case really must be handled
but I don't see it was designed to be here
- If more than one such class exists, choose the one with lowest threshold
- If more than one such class exists, pick the first one
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