Github user zhengruifeng commented on the issue:
https://github.com/apache/spark/pull/20164
@srowen Different from the base model (like LoR), OVR and OVRModel do not
have param `rawPredictionCol`.
So if the input dataframe contains a column which has the same name as base
model's `getRawPredictionCol`, then OVRModel can not transform the input.
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