tensorflow/models · error · LookupError

registration key {reg_key} is never registered. Please make

Error message

registration key {reg_key} is never registered. Please make sure the {reg_key} and its library is imported and linked to the trainer binary.

What it means

Error "registration key {reg_key} is never registered. Please make sure the {reg_key} and its library is imported and linked to the trainer binary." thrown in tensorflow/models.

Source

Thrown at official/core/registry.py:97

  Returns:
    The registered function or class.
  Raises:
    LookupError: when reg_key cannot be found.
  """
  if isinstance(reg_key, str):
    hierarchy = reg_key.split("/")
    collection = registered_collection
    for h_idx, entry_name in enumerate(hierarchy):
      if entry_name not in collection:
        raise LookupError(
            f"collection path {entry_name} at position {h_idx} is never "
            f"registered. Please make sure the {entry_name} and its library is "
            "imported and linked to the trainer binary.")
      collection = collection[entry_name]
    return collection
  else:
    if reg_key not in registered_collection:
      raise LookupError(
          f"registration key {reg_key} is never "
          f"registered. Please make sure the {reg_key} and its library is "
          "imported and linked to the trainer binary.")
    return registered_collection[reg_key]

View on GitHub (pinned to e006f5f0d5)

When it happens

Trigger: Thrown at official/core/registry.py:97 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/f9082e69901ec435. Report an issue: GitHub.