    def __call__(self):
        """
        The framework calls __call__ function repeatedly for every input data.

        Args:

        Returns:

        Raises:
            An exception during __init__ can terminate the graph run.
        """
        raise NotImplementedError
The framework calls __call__ function repeatedly for every input data.

Args:

Returns:

Raises:
An exception during __init__ can terminate the graph run.
towhee/operator/base.py