tensorflow/models · error · ValueError

Decoder version cannot be None, specify v3 or v4.

Error message

Decoder version cannot be None, specify v3 or v4.

What it means

Error "Decoder version cannot be None, specify v3 or v4." thrown in tensorflow/models.

Source

Thrown at official/projects/yolo/modeling/decoders/yolo_decoder.py:601

    input_specs: A `dict` of input specifications. A dictionary consists of
      {level: TensorShape} from a backbone.
    model_config: A OneOfConfig. Model config.
    l2_regularizer: A `tf_keras.regularizers.Regularizer` instance. Default to
      None.
    **kwargs: Additional kwargs arguments.

  Returns:
    A `tf_keras.Model` instance of the Yolo FPN/PAN decoder.
  """
  decoder_cfg = model_config.decoder.get()
  norm_activation_config = model_config.norm_activation

  activation = (
      decoder_cfg.activation if decoder_cfg.activation != 'same' else
      norm_activation_config.activation)

  if decoder_cfg.version is None:  # custom yolo
    raise ValueError('Decoder version cannot be None, specify v3 or v4.')

  if decoder_cfg.version not in YOLO_MODELS:
    raise ValueError(
        'Unsupported model version please select from {v3, v4}, '
        'or specify a custom decoder config using YoloDecoder in you yaml')

  if decoder_cfg.type is None:
    decoder_cfg.type = 'regular'

  if decoder_cfg.type not in YOLO_MODELS[decoder_cfg.version]:
    raise ValueError('Unsupported model type please select from '
                     '{yolo_model.YOLO_MODELS[decoder_cfg.version].keys()}'
                     'or specify a custom decoder config using YoloDecoder.')

  base_model = YOLO_MODELS[decoder_cfg.version][decoder_cfg.type].copy()

  cfg_dict = decoder_cfg.as_dict()
  for key in base_model:

View on GitHub (pinned to e006f5f0d5)

When it happens

Trigger: Thrown at official/projects/yolo/modeling/decoders/yolo_decoder.py:601 when the library encounters an invalid state.

Common situations: See trigger scenarios.

AI-assisted analysis of tensorflow/models@e006f5f0d5 (2026-08-24). Data as JSON: /api/errors/fdbbccb03ebb2c61. Report an issue: GitHub.