uple = (64,) layers_per_block: int = 1 act_fn: str = 'silu' latent_channels: int = 4 norm_num_groups: int = 32 sample_size: int = 32 scaling_factor: float = 0.18215 latents_mean: Optional = None latents_std: Optional = None force_upcast: float = True  )   Parameters   in_channels (int, optional, defaults to 3) — Number of channels in the input image.   out_channels (int,  optional, defaults to 3) — Number of channels in the output.   down_block