{
  "task": "usrnet" //  
  , "model": "plain4" // "plain" | "gan"
  , "gpu_ids": [0]
  , "scale": 4
  , "n_channels": 3 // 1 for grayscale image restoration, 3 for color image restoration
  , "merge_bn": false
  , "merge_bn_startpoint": 300000

  , "datasets": {
    "train": {
      "name": "train_dataset"
      , "dataset_type": "usrnet"
      , "dataroot_H": "trainsets/trainH"
      , "dataroot_L": null
      , "H_size": 96 // 128 | 192
      , "use_flip": true
      , "use_rot": true
      , "scales": [1, 2, 3, 4]
      , "dataloader_shuffle": true
      , "dataloader_num_workers": 8
      , "dataloader_batch_size": 48
    }
    , "test": {
      "name": "test_dataset"
      , "dataset_type": "usrnet"
      , "dataroot_H": "testsets/set5"
      , "dataroot_L": null
    }
  }

  , "path": {
    "root": "SR"
    , "pretrained_netG": null
  }

  , "netG": {
    "net_type": "usrnet" // "srresnet" | "rrdbnet" | "rcan" | "unet" | "unetplus" | "nonlocalunet"
    , "n_iter": 6 // 8
    , "h_nc": 32 // 64
    , "in_nc": 4
    , "out_nc": 3
    , "nc": [16, 32, 64, 64] // [64, 128, 256, 512] for "unet"
    , "nb": 2
    , "gc": 32
    , "ng": 2
    , "reduction" : 16
    , "act_mode": "R" // "BR" for BN+ReLU | "R" for ReLU
    , "upsample_mode": "convtranspose" // "pixelshuffle" | "convtranspose" | "upconv"
    , "downsample_mode": "strideconv" // "strideconv" | "avgpool" | "maxpool"

    , "init_type": "orthogonal" // "orthogonal" | "normal" | "uniform" | "xavier_normal" | "xavier_uniform" | "kaiming_normal" | "kaiming_uniform"
    , "init_bn_type": "uniform" // "uniform" | "constant"
    , "init_gain": 0.2
  }

  , "train": {
    "G_lossfn_type": "l1" // "l1" | "l2sum" | "l2" | "ssim"
    , "G_lossfn_weight": 1.0

    , "G_optimizer_type": "adam"
    , "G_optimizer_lr": 1e-4
    , "G_optimizer_wd": 0
    , "G_optimizer_clipgrad": null

    , "G_scheduler_type": "MultiStepLR"
    , "G_scheduler_milestones": [100000, 200000, 300000, 400000]
    , "G_scheduler_gamma": 0.5

    , "G_regularizer_orthstep": null
    , "G_regularizer_clipstep": null

    , "checkpoint_test": 5000
    , "checkpoint_save": 5000
    , "checkpoint_print": 200
  }
}