tensorflow/models · error · NotImplementedError

The mode is not implemented: %s

Error message

The mode is not implemented: %s

What it means

Error "The mode is not implemented: %s" thrown in tensorflow/models.

Source

Thrown at official/core/train_lib.py:287

        self.controller.train_and_evaluate(
            train_steps=params.trainer.train_steps,
            eval_steps=params.trainer.validation_steps,
            eval_interval=params.trainer.validation_interval)
      elif mode == 'eval':
        self.controller.evaluate(steps=params.trainer.validation_steps)
      elif mode == 'continuous_eval':

        def timeout_fn():
          if self.trainer.global_step.numpy() >= params.trainer.train_steps:
            return True
          return False

        self.controller.evaluate_continuously(
            steps=params.trainer.validation_steps,
            timeout=params.trainer.continuous_eval_timeout,
            timeout_fn=timeout_fn)
      else:
        raise NotImplementedError('The mode is not implemented: %s' % mode)

    num_params = train_utils.try_count_params(self.trainer.model)
    if num_params is not None:
      logging.info('Number of trainable params in model: %f Millions.',
                   num_params / 10.**6)

    flops = train_utils.try_count_flops(self.trainer.model)
    if flops is not None:
      logging.info('FLOPs (multi-adds) in model: %f Billions.',
                   flops / 10.**9 / 2)

    if self._run_post_eval or mode == 'train_and_post_eval':
      with self.strategy.scope():
        return self.trainer.model, self.controller.evaluate(  # pytype: disable=bad-return-type  # always-use-property-annotation
            steps=params.trainer.validation_steps)
    else:
      return self.trainer.model, {}

View on GitHub (pinned to e006f5f0d5)

When it happens

Trigger: Thrown at official/core/train_lib.py:287 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/f510765adef32899. Report an issue: GitHub.