…tructured _RLearner to be subclass of _OrthoLearner. Small modifiications to first stage and final wrappers in DML and in preprocessing done at the beginning of statsmodels inference.

…ualization inside the _RLearner when both X nad W are None

…learner do not contain all the indices. We now call fit model final only on that subset of indices for which we have calculated their nuisance values.

…learner do not contain all the indices. We now call fit model final only on that subset of indices for which we have calculated their nuisance values.

… classes and models of child classesto omit keyword arguments in their signature if those will always be equal to None.

…e_ attribute, available after fit of the _OrthoLearner. Changing to the sphinx module template, so that private methods are printed and methods are inheritted from parents. Added all tests to the _OrthoLearner. Added docstring to the effect function that is replaced in the DiscreteTreatmentExpansionMixin.

…st across samples and then take the mean across outcome dimensions

…er. Improved docstrings in both

…arner in the OrthoLearner notebook

…abel version.

…riate error messages. Added tests that check that these messages are correctly raised.

… varialbes in the ortho learner

…ession in utilities

…r now until better solution is found. Also creating separate headers for private and public modules on sidebar of docs