timestep embedding.
conv_in_kernel (int, optional, default to 3): The kernel size of conv_in layer. conv_out_kernel (int,
optional, default to 3): The kernel size of conv_out layer. 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 ti