def prepare_guidance(
        self,
        text: list[str],
        optional_models: dict[str, nn.Module],
        device: torch.device,
        dtype: torch.dtype,
        **kwargs,
    ) -> dict[str, Tensor]:
        """Prepare the guidance for the model. This method will alter text."""
Prepare the guidance for the model. This method will alter text.
opensora/utils/sampling.py