tensorflow/models · error · ValueError

Invalid label field: {self._label_field}!

Error message

Invalid label field: {self._label_field}!

What it means

Error "Invalid label field: {self._label_field}!" thrown in tensorflow/models.

Source

Thrown at official/projects/yt8m/dataloaders/yt8m_input.py:308

        feature_type = tf.io.FixedLenSequenceFeature([], dtype=tf.string)
      else:
        dtype = tf.dtypes.as_dtype(self._feature_dtypes[i])
        feature_shape = [self._feature_sizes[i]]
        if self._feature_sources[i] == "feature":
          feature_type = tf.io.FixedLenSequenceFeature(feature_shape, dtype)
        else:
          feature_type = tf.io.FixedLenFeature(feature_shape, dtype)
      if self._feature_sources[i] == "feature":
        self._sequence_features[name] = feature_type
      elif self._feature_sources[i] == "context":
        self._context_features[name] = feature_type
      else:
        raise ValueError(
            f"Unknown feature source {self._feature_sources[i]} for {name}")

  def _add_labels_specification(self):
    if not self._label_field:
      raise ValueError(f"Invalid label field: {self._label_field}!")
    self._context_features.update(
        {self._label_field: tf.io.VarLenFeature(tf.int64)})

  def decode(self,
             serialized_example: tf.train.SequenceExample) -> Dict[str, Any]:
    """Parses a single tf.train.SequenceExample into video and label tensors."""
    contexts, features = tf.io.parse_single_sequence_example(
        serialized_example,
        context_features=self._context_features,
        sequence_features=self._sequence_features)
    decoded_tensor = {**contexts, **features}
    for i, name in enumerate(self._feature_names):
      # Convert the VarLen feature to dense tensor.
      if self._feature_from_bytes[i]:
        dtype = tf.dtypes.as_dtype(self._feature_dtypes[i])
        decoded_tensor[name] = tf.cast(
            tf.io.decode_raw(decoded_tensor[name], out_type=dtype), tf.float32
        )

View on GitHub (pinned to e006f5f0d5)

When it happens

Trigger: Thrown at official/projects/yt8m/dataloaders/yt8m_input.py:308 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/a634a5a4e20a0fc8. Report an issue: GitHub.