{
  "img_h": 32,
  "img_w": 160,
  "num_classes": 63,
  "charset": "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789",
  "preprocess": "grayscale, resize to 32x160, /255.0",
  "blank_idx": 0,
  "decode": "CTC greedy",
  "hidden": 128,
  "acc": 0.9937106918238994
}