do not support SFT now
SRGAN does not support dist training now

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## TODO
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# data
    LR_dataset.py
    LRHR_seg_bg_dataset.py
# models
    # modules
        seg_arch.py
        sft_arch.py
    SFTGAN_ACD_model.py
# options
    # test
    # train
        train_ESRGAN.yml
        train_SRGAN.yml
# scripts
    # back_projection
    color2gray.py
    extract_subimgs_single.py
    generate_mod_LR_bic.m
    generate_mod_LR_bic.py
    transfer_params_sft.py
test_seg.py
test_sftgan.py