]         n_splits : number of splits to use in cross-fitting         binary_instrument : whether to stratify cross-fitting splits by instrument         binary_treatment : whether to stratify cross-fitting splits by treatment         """         self.model_Y_X = [clone(model_Y_X, safe=False) for _ in range(n_splits)]         self.model_T_X = [clone(model_T_X, safe=False) for _ in range(n_splits)]         self.model_