mbinations of values that
are known to work well for different pipelines such as Stable Diffusion v1, v2, and Stable Diffusion XL.  forward  < source > ( sample: FloatTensor timestep: Union encoder_hidden_states: Tensor class_labels: Optional = None timestep_cond: Optional = None attention_mask: Optional = None cross_attention_kwargs: Optional = None added_cond_kwargs: Optional = None down_block_additional_residuals: Optional = None mid_block_a