docs: def compile_default_action(self, batch_size: Optional[int] = None) -> Sequence[tf.Tensor]:
          '''Returns a tuple of tensors representing the default action fluents.
  
          Args:
              batch_size (int): The batch size.
  
          Returns:
              Sequence[tf.Tensor]: A tuple of tensors.
          '''
          with self.graph.as_default():
              with tf.name_scope('default_action'):
                  self._initialize_default_action_fluents()
                  if batch_size is None:
                      return self.default_action_fluents
                  return self._compile_batch_fluents(self.default_action_fluents, batch_size)