src/transformers/onnx/config.py/OnnxConfig/outputs
class OnnxConfig:    def outputs(self) -> Mapping[str, Mapping[int, str]]:
        """
        Mapping containing the axis definition of the output tensors to provide to the model

        Returns:
            For each output: its name associated to the axes symbolic name and the axis position within the tensor
        """
        return self._TASKS_TO_COMMON_OUTPUTS[self.task]