Github user BryanCutler commented on the issue:

    https://github.com/apache/spark/pull/16782
  
    Hi @avi8tr , what exactly about this proposed fix is not thread-safe?  
`_input_kwargs` also performs another function which is to only contain the 
params explicitly set by the user.  These get passed along separately with a 
complete set of default values to the underlying pyspark.ml param maps.  What 
you are proposing does not account for that and would require major 
restructuring as many of the pyspark.ml classes have huge param lists.


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