tensorflow/models · error · ValueError

Duplicated tasks found, task.name is %s

Error message

Duplicated tasks found, task.name is %s

What it means

Error "Duplicated tasks found, task.name is %s" thrown in tensorflow/models.

Source

Thrown at official/modeling/multitask/multitask.py:56

               task_weights: Optional[Dict[str, Union[float, int]]] = None,
               task_eval_steps: Optional[Dict[str, int]] = None,
               name: Optional[str] = None):
    """MultiTask initialization.

    Args:
      tasks: a list or a flat dict of Task.
      task_weights: a dict of (task, task weight), task weight can be applied
        directly during loss summation in a joint backward step, or it can be
        used to sample task among interleaved backward step.
      task_eval_steps: a dict of (task, eval steps).
      name: the instance name of a MultiTask object.
    """
    super().__init__(name=name)
    if isinstance(tasks, list):
      self._tasks = {}
      for task in tasks:
        if task.name in self._tasks:
          raise ValueError("Duplicated tasks found, task.name is %s" %
                           task.name)
        self._tasks[task.name] = task
    elif isinstance(tasks, dict):
      self._tasks = tasks
    else:
      raise ValueError("The tasks argument has an invalid type: %s" %
                       type(tasks))
    self.task_eval_steps = task_eval_steps or {}
    self._task_weights = task_weights or {}
    self._task_weights = dict([
        (name, self._task_weights.get(name, 1.0)) for name in self.tasks
    ])

  @classmethod
  def from_config(cls, config: configs.MultiTaskConfig, logging_dir=None):
    tasks = {}
    task_eval_steps = {}
    task_weights = {}

View on GitHub (pinned to e006f5f0d5)

When it happens

Trigger: Thrown at official/modeling/multitask/multitask.py:56 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/26c06cb7418cef1f. Report an issue: GitHub.