ormer_layers_per_block : (Tuple[Tuple], optional, defaults to None):
The number of transformer blocks of type BasicTransformerBlock, in the upsampling
blocks of the U-Net. Only relevant if transformer_layers_per_block is of type Tuple[Tuple] and for
CrossAttnDownBlock2D, CrossAttnUpBlock2D,
UNetMidBlock2DCrossAttn.
encoder_hid_dim (int, optional, defaults to None):
If encoder_hid_dim_type is defined, encoder_hidden_states will be projected from