requency shift for Fourier time embedding.   flip_sin_to_cos (bool, optional, defaults to True) —
Whether to flip sin to cos for Fourier time embedding.   down_block_types (Tuple[str], optional, defaults to ("DownBlock2D", "AttnDownBlock2D", "AttnDownBlock2D", "AttnDownBlock2D")) —
Tuple of downsample block types.   mid_block_type (str, optional, defaults to "UNetMidBlock2D") —
Block type for middle of UNet, it can be either UNetMidBlock2D or U