r to include self-attention in the basic transformer blocks, see
BasicTransformerBlock.   block_out_channels (Tuple[int], optional, defaults to (320, 640, 1280, 1280)) —
The tuple of output channels for each block.   layers_per_block (int, optional, defaults to 2) — The number of layers per block.   downsample_padding (int, optional, defaults to 1) — The padding to use for the downsampling convolution.   mid_block_scale_factor (float, optional,