Github user jkbradley commented on the issue:
https://github.com/apache/spark/pull/17090
It's a good point about making an implicit decision. We could deprecate
these methods in favor of transform-based ones in the future---we have done
this in the past---but it does push the long-term decision in a clear direction.
My hesitation about transform is not just about the schema. It's also
because I'm still unclear how we could plug ALS into tuning without having
tuning specifically understand ALS (knowing about users, items, etc.). I'll
add my thoughts on the JIRA.
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