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### What changes were proposed in this pull request? impl a new strategy `mode`: replace missing using the most frequent value along each column. ### Why are the changes needed? it is highly scalable, and had been a function in [sklearn.impute.SimpleImputer](https://scikit-learn.org/stable/modules/generated/sklearn.impute.SimpleImputer.html#sklearn.impute.SimpleImputer) for a long time. ### Does this PR introduce _any_ user-facing change? Yes, a new strategy is added ### How was this patch tested? updated testsuites Closes #30397 from zhengruifeng/imputer_max_freq. Lead-authored-by: Ruifeng Zheng <ruifengz@foxmail.com> Co-authored-by: zhengruifeng <ruifengz@foxmail.com> Signed-off-by: Sean Owen <srowen@gmail.com> |
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