EconML
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Add support for sample_weights in DRTester
To solve issue #1004 , this PR adds support for sample_weights in DRTester class. It implements it in fit_nuisances and in each evaluation (calibration, uplift and blp).
I'm going to implement tests to this new feature
pr is ready to review. tests implemented. @kbattocchi , could you rerun the two tests failed due to a temporary unavailability of uv?