projection_class_embeddings_input_dim (int,
optional): The dimension of the class_labels input when
class_embed_type="projection". Required when class_embed_type="projection".
class_embeddings_concat (bool, optional, defaults to False): Whether to concatenate the time
embeddings with the class embeddings.
mid_block_only_cross_attention (bool, optional, defaults to None):
Whether to use cross attention with the mid block when using the UNetMidBl