tensorflow/models · error · ValueError

Unrecognized constructor: {}

Error message

Unrecognized constructor: {}

What it means

Error "Unrecognized constructor: {}" thrown in tensorflow/models.

Source

Thrown at official/recommendation/data_pipeline.py:982

    #   negative item choice index.

    assert np.all((right_index - left_index) <= 1)

    output[not_use_shortcut] = (
        self._sorted_train_pos_items[right_index] -
        (self._total_negatives[right_index] - neg_item_choice))

    assert np.all(output >= 0)

    return output


def get_constructor(name):
  if name == "bisection":
    return BisectionDataConstructor
  if name == "materialized":
    return MaterializedDataConstructor
  raise ValueError("Unrecognized constructor: {}".format(name))

View on GitHub (pinned to e006f5f0d5)

When it happens

Trigger: Thrown at official/recommendation/data_pipeline.py:982 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/7f878922e023f6ea. Report an issue: GitHub.