econml/dml/dml.py [109:128]:
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            self._fit_cate_intercept = fit_cate_intercept
            if self._fit_cate_intercept:
                add_intercept_trans = FunctionTransformer(add_intercept,
                                                          validate=True)
                if featurizer:
                    self._featurizer = Pipeline([('featurize', self._original_featurizer),
                                                 ('add_intercept', add_intercept_trans)])
                else:
                    self._featurizer = add_intercept_trans
            else:
                self._featurizer = self._original_featurizer

    def _combine(self, X, T, fitting=True):
        if X is not None:
            if self._featurizer is not None:
                F = self._featurizer.fit_transform(X) if fitting else self._featurizer.transform(X)
            else:
                F = X
        else:
            if not self._fit_cate_intercept:
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econml/iv/dml/_dml.py [119:139]:
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        self._fit_cate_intercept = fit_cate_intercept

        if self._fit_cate_intercept:
            add_intercept_trans = FunctionTransformer(add_intercept,
                                                      validate=True)
            if featurizer:
                self._featurizer = Pipeline([('featurize', self._original_featurizer),
                                             ('add_intercept', add_intercept_trans)])
            else:
                self._featurizer = add_intercept_trans
        else:
            self._featurizer = self._original_featurizer

    def _combine(self, X, T, fitting=True):
        if X is not None:
            if self._featurizer is not None:
                F = self._featurizer.fit_transform(X) if fitting else self._featurizer.transform(X)
            else:
                F = X
        else:
            if not self._fit_cate_intercept:
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