tensorflow/models · error · KeyError

Collection path {} at position {} already registered as a fu

Error message

Collection path {} at position {} already registered as a function or class.

What it means

Error "Collection path {} at position {} already registered as a function or class." thrown in tensorflow/models.

Source

Thrown at official/core/registry.py:48

      put into this collection.
    reg_key: The key for retrieving the registered function or class. If reg_key
      is a string, it can be hierarchical like my_model/my_exp/my_config_0
  Returns:
    A decorator function
  Raises:
    KeyError: when function or class to register already exists.
  """
  def decorator(fn_or_cls):
    """Put fn_or_cls in the dictionary."""
    if isinstance(reg_key, str):
      hierarchy = reg_key.split("/")
      collection = registered_collection
      for h_idx, entry_name in enumerate(hierarchy[:-1]):
        if entry_name not in collection:
          collection[entry_name] = {}
        collection = collection[entry_name]
        if not isinstance(collection, dict):
          raise KeyError(
              "Collection path {} at position {} already registered as "
              "a function or class.".format(entry_name, h_idx))
      leaf_reg_key = hierarchy[-1]
    else:
      collection = registered_collection
      leaf_reg_key = reg_key

    if leaf_reg_key in collection:
      raise KeyError("Function or class {} registered multiple times.".format(
          leaf_reg_key))

    collection[leaf_reg_key] = fn_or_cls
    return fn_or_cls
  return decorator


def lookup(registered_collection, reg_key):
  """Lookup and return decorated function or class in the collection.

View on GitHub (pinned to e006f5f0d5)

When it happens

Trigger: Thrown at official/core/registry.py:48 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/c00f08a689bca8c7. Report an issue: GitHub.