vega 训练服务的侧拉起vgg19服务，链接抛异常未做捕获

[jiangzc86]

[zhangjiajin]

    @train_process_wrapper
    def train_process(self):
        """Validate process for the model validate worker."""
        try:
            self.load_model()
            self.valid_loader = self._init_dataloader(mode='test')
            performance = self.valid()
            ReportClient().update(self.step_name, self.worker_id, performance=performance)
            logging.info(f"finished device evaluation, id: {self.worker_id}, performance: {performance}")
        except Exception:
            logging.error(traceback.format_exc())
            logging.error("Failed to evalute on device.")