Github user WeichenXu123 commented on the issue:
https://github.com/apache/spark/pull/19621
I want to ask, for option `StringIndexer.frequencyDesc`, in the case
existing two labels which have the same frequency, which of them will be put in
the front ?
If this is not specified, then we should modify some test cases in
`RFomular`, which will generate nondeterministic result.
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