botorch/models/pairwise_gp.py [374:383]:
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        self,
        utility: Union[Tensor, np.ndarray],
        datapoints: Tensor,
        D: Tensor,
        DT: Tensor,
        covar_chol: Tensor,
        covar_inv: Tensor,
        ret_np: bool = False,
    ) -> Union[Tensor, np.ndarray]:
        r"""Compute the gradient of S loss wrt to f/utility in [Chu2005preference]_.
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botorch/models/pairwise_gp.py [417:426]:
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        self,
        utility: Union[Tensor, np.ndarray],
        datapoints: Tensor,
        D: Tensor,
        DT: Tensor,
        covar_chol: Tensor,
        covar_inv: Tensor,
        ret_np: bool = False,
    ) -> Union[Tensor, np.ndarray]:
        r"""Compute the hessian of S loss wrt utility for finding f_map.
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