Github user actuaryzhang commented on the issue:
https://github.com/apache/spark/pull/17864
@MLnick Thanks much for your comments. Yes, I think always returning Double
is consistent with Python and R and also other transformers in ML. Plus, as
@hhbyyh mentioned, this makes the implementation easier. Would you mind taking
a look at the code and let me know if there is any suggestion for improvement?
The doc is already updated to make it clear that it always returns Double
regardless of the input type.
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