{
  "pack": {
    "type": "tensor_from_image",
    "image": "image",
    "transforms": [
      {
        "type": "image_to_image",
        "name": "center_crop",
        "width": "$crop_width",
        "height": "$crop_height"
      },
      {
        "type": "image_to_image",
        "name": "scale",
        "width": "$scale_width",
        "height": "$scale_height"
      },
      {
        "type": "image_to_tensor",
        "name": "greyscale_norm",
        "colorBackground": "$colorBackground",
        "colorForeground": "$colorForeground",
        "mean": 0.1307,
        "std": 0.3081
      }
    ]
  },
  "unpack": {
    "type": "tensor",
    "dtype": "float",
    "key": "scores"
  }
}