def get_param(self):
        """Method to get current optimizer's parameter value
        """
        lr_list = self.lr_scheduler.get_lr()
        if len(lr_list) > 1:
            raise ValueError("Optimizer passed to lr_scheduler should have a single param group, "
                             "but currently there are {} param groups".format(len(lr_list)))
        return lr_list[0]