tensorflow/models · error · ValueError

The bind decorator is supposed to apply on the class attribu

Error message

The bind decorator is supposed to apply on the class attribute. Received {config_cls}, not a class.

What it means

Error "The bind decorator is supposed to apply on the class attribute. Received {config_cls}, not a class." thrown in tensorflow/models.

Source

Thrown at official/modeling/hyperparams/base_config.py:38

import inspect
import types
import typing
from typing import Any, List, Mapping, Optional, Type, Union

from absl import logging
import tensorflow as tf, tf_keras
import yaml

from official.modeling.hyperparams import params_dict


_BOUND = set()


def bind(config_cls):
  """Bind a class to config cls."""
  if not inspect.isclass(config_cls):
    raise ValueError('The bind decorator is supposed to apply on the class '
                     f'attribute. Received {config_cls}, not a class.')

  def decorator(builder):
    if config_cls in _BOUND:
      raise ValueError('Inside a program, we should not bind the config with a'
                       ' class twice.')
    if inspect.isclass(builder):
      config_cls._BUILDER = builder  # pylint: disable=protected-access
    elif inspect.isfunction(builder):

      def _wrapper(self, *args, **kwargs):  # pylint: disable=unused-argument
        return builder(*args, **kwargs)

      config_cls._BUILDER = _wrapper  # pylint: disable=protected-access
    else:
      raise ValueError(f'The `BUILDER` type is not supported: {builder}')
    _BOUND.add(config_cls)
    return builder

View on GitHub (pinned to e006f5f0d5)

When it happens

Trigger: Thrown at official/modeling/hyperparams/base_config.py:38 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/a1898e7ac233925b. Report an issue: GitHub.