ENH: Add Reweighing preprocessing technique (#5) - #26
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Description #5
This PR adds the Reweighing preprocessing technique to mitigate bias with respect to sensitive features.
fairlearn/preprocessing/reweighing.pyimplements the transformer.test/unit/preprocessing/test_reweighing.pyincludes a basic unit test to ensure sample weights are positive and correctly sized.Related issue: Closes #5.
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