 of channels in the input image.   out_channels (int,  optional, defaults to 3) — Number of channels in the output.   down_block_types (Tuple[str], optional, defaults to ("DownEncoderBlock2D",)) —
Tuple of downsample block types.   up_block_types (Tuple[str], optional, defaults to ("UpDecoderBlock2D",)) —
Tuple of upsample block types.   block_out_channels (Tuple[int], optional, defaults to (64,)) —
Tuple of block output channels.   act_fn (str