added base contrast encoder

scikit-learn-contrib / category_encoders

A library of sklearn compatible categorical variable encoders

BSD 3-Clause "New" or "Revised" License

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Closed PaulWestenthanner closed 2 years ago

PaulWestenthanner commented 2 years ago

Simplify contrast coding encoders (Sum Encoder, Polynomial Encoder, Backward Difference and Helmert) by removing copy-pasted code
Remove ~100 lines of duplicated code per encoder