{
  "model_type": "chess-ocr-bilstm",
  "architecture": "CNN + BiLSTM + CTC",
  "framework": "pytorch",
  "img_height": 64,
  "img_width": 256,
  "num_classes": 28,
  "hidden_size": 64,
  "charset": ["", "K", "Q", "R", "B", "N", "a", "b", "c", "d", "e", "f", "g", "h", "1", "2", "3", "4", "5", "6", "7", "8", "x", "+", "#", "=", "O", "-"],
  "preprocessing": {
    "remove_lines": false,
    "alignment": "center-padded",
    "normalization": "(pixel / 255.0 - 0.5) / 0.5"
  },
  "performance": {
    "move_recognition_accuracy": 0.829,
    "character_error_rate": 0.087
  }
}