botorch/models/transforms/outcome.py [399:415]:
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    def subset_output(self, idcs: List[int]) -> OutcomeTransform:
        r"""Subset the transform along the output dimension.

        Args:
            idcs: The output indices to subset the transform to.

        Returns:
            The current outcome transform, subset to the specified output indices.
        """
        new_outputs = None
        if self._outputs is not None:
            if min(self._outputs + idcs) < 0:
                raise NotImplementedError(
                    f"Negative indexing not supported for {self.__class__.__name__} "
                    "when subsetting outputs and only transforming some outputs."
                )
            new_outputs = [i for i in self._outputs if i in idcs]
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botorch/models/transforms/outcome.py [528:544]:
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    def subset_output(self, idcs: List[int]) -> OutcomeTransform:
        r"""Subset the transform along the output dimension.

        Args:
            idcs: The output indices to subset the transform to.

        Returns:
            The current outcome transform, subset to the specified output indices.
        """
        new_outputs = None
        if self._outputs is not None:
            if min(self._outputs + idcs) < 0:
                raise NotImplementedError(
                    f"Negative indexing not supported for {self.__class__.__name__} "
                    "when subsetting outputs and only transforming some outputs."
                )
            new_outputs = [i for i in self._outputs if i in idcs]
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