设置这个参数 training (enum, default TrainingMode.EVAL) – TrainingMode.EVAL: export the model in inference mode. TrainingMode.PRESERVE: export the model in inference mode if model.training is False and in training mode if model.training is True. TrainingMode.TRAINING: export the model in training mode. Disables optimizations which might interfere with training. 详细信息看文档,这里我随便粘贴了一下