tensorflow/models · error · ValueError

Unknown decoder type: {}!

Error message

Unknown decoder type: {}!

What it means

Error "Unknown decoder type: {}!" thrown in tensorflow/models.

Source

Thrown at official/projects/detr/tasks/detection.py:109

                   params,
                   input_context: Optional[tf.distribute.InputContext] = None):
    """Build input dataset."""
    if isinstance(params, coco.COCODataConfig):
      dataset = coco.COCODataLoader(params).load(input_context)
    else:
      if params.tfds_name:
        decoder = tfds_factory.get_detection_decoder(params.tfds_name)
      else:
        decoder_cfg = params.decoder.get()
        if params.decoder.type == 'simple_decoder':
          decoder = tf_example_decoder.TfExampleDecoder(
              regenerate_source_id=decoder_cfg.regenerate_source_id)
        elif params.decoder.type == 'label_map_decoder':
          decoder = tf_example_label_map_decoder.TfExampleDecoderLabelMap(
              label_map=decoder_cfg.label_map,
              regenerate_source_id=decoder_cfg.regenerate_source_id)
        else:
          raise ValueError('Unknown decoder type: {}!'.format(
              params.decoder.type))

      parser = detr_input.Parser(
          class_offset=self._task_config.losses.class_offset,
          output_size=self._task_config.model.input_size[:2],
      )

      reader = input_reader_factory.input_reader_generator(
          params,
          dataset_fn=dataset_fn.pick_dataset_fn(params.file_type),
          decoder_fn=decoder.decode,
          parser_fn=parser.parse_fn(params.is_training))
      dataset = reader.read(input_context=input_context)

    return dataset

  def _compute_cost(self, cls_outputs, box_outputs, cls_targets, box_targets):
    # Approximate classification cost with 1 - prob[target class].

View on GitHub (pinned to e006f5f0d5)

When it happens

Trigger: Thrown at official/projects/detr/tasks/detection.py:109 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/f403ab9d61b1b25a. Report an issue: GitHub.