One Hot Encoder: Drop one redundant feature by default for features with two categories #1993
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Closes #1936. Uses scikit-learn impl. Does not always select minority class, see #1936 (comment) as to why this is challenging :'(
I also have my branch
1936_ohewhere I was testing out impl for minority class before hitting the error if anyone is curious.Useful for parameters defaults: #830
If drop == 'is_binary' and 'handle_unknown' == 'ignore', scikit-learn raises an error.