Github user hhbyyh commented on the issue:
https://github.com/apache/spark/pull/11601
Thanks for the comments @MLnick @jkbradley @sethah
I have sent update according to the comments and change
`ImputerModel.surrogate` and persistence format into DataFrame.
As for the multiple columns support, do we need to assemble the imputed
column together into one output column or should we support multiple output
columns?
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