Github user junyangq commented on the issue:
https://github.com/apache/spark/pull/14384
@mengxr If we only want `rank`, `userFactors`, `itemFactors`, `userCol` and
`itemCol`, we don't have to save metadata, but if we want any more, it seems
that they are not saved in the output of the `fit` method? Or perhaps we can
explicitly set some fields in the fitted object?
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