tensorflow/models · error · ValueError

Unknown builder type {}

Error message

Unknown builder type {}

What it means

Error "Unknown builder type {}" thrown in tensorflow/models.

Source

Thrown at official/legacy/image_classification/dataset_factory.py:326

    """Construct a dataset end-to-end and return it.

    Args:
      input_context: An optional context provided by `tf.distribute` for
        cross-replica training.

    Returns:
      A TensorFlow dataset outputting batched images and labels.
    """
    builders = {
        'tfds': self.load_tfds,
        'records': self.load_records,
        'synthetic': self.load_synthetic,
    }

    builder = builders.get(self.config.builder, None)

    if builder is None:
      raise ValueError('Unknown builder type {}'.format(self.config.builder))

    self.input_context = input_context
    dataset = builder()
    dataset = self.pipeline(dataset)

    return dataset

  def load_tfds(self) -> tf.data.Dataset:
    """Return a dataset loading files from TFDS."""

    logging.info('Using TFDS to load data.')
    builder = tfds.builder(self.config.name, data_dir=self.config.data_dir)

    if self.config.download:
      builder.download_and_prepare()

    decoders = {}

View on GitHub (pinned to e006f5f0d5)

When it happens

Trigger: Thrown at official/legacy/image_classification/dataset_factory.py:326 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/2c09c3ed2f4d32b4. Report an issue: GitHub.