Function sr_create_model

(
    large_size,
    small_size,
    num_channels,
    num_res_blocks,
    learn_sigma,
    class_cond,
    use_checkpoint,
    attention_resolutions,
    num_heads,
    num_head_channels,
    num_heads_upsample,
    use_scale_shift_norm,
    dropout,
    resblock_updown,
    use_fp16,
)