paddle官网的异步读取数据的范例代码中，无法使用save_inference保存模型

[tianrenheyi09]

bug描述 Describe the Bug

https://www.paddlepaddle.org.cn/documentation/docs/zh/1.8/advanced_guide/data_preparing/static_mode/use_py_reader.html paddle官网的异步读取数据的范例代码中，无法使用save_inference保存模型 在以上实例代码中，每个epoch加上保存模型的代码，报错 fluid.io.save_inference_model(dirname="./modelm", feeded_var_names=['image'], target_vars=[train_loss], executor=exe)

其他补充信息 Additional Supplementary Information

No response

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[ronny1996]

请问使用什么版本的Paddle和环境？有详细的错误信息吗？

[tianrenheyi09]

paddle1.8，提示变量不存在

[tianrenheyi09]

INFO 2022-07-22 17:57:43,665 dataloader_auto_checkpoint.py:157] end dataloader epoch_no:0
Traceback (most recent call last):
File "test5.py", line 135, in
fluid.io.save_inference_model(dirname="./modelm", feeded_var_names=['image'], target_vars=[train_loss], executor=exe)
File "/opt/_internal/cpython-3.7.0/lib/python3.7/site-packages/paddle/fluid/io.py", line 1250, in save_inference_model
prepend_feed_ops(main_program, feeded_var_names)
File "/opt/_internal/cpython-3.7.0/lib/python3.7/site-packages/paddle/fluid/io.py", line 1046, in prepend_feed_ops
out = global_block.var(name)
File "/opt/_internal/cpython-3.7.0/lib/python3.7/site-packages/paddle/fluid/framework.py", line 2392, in var
raise ValueError("var %s not in this block" % name)
ValueError: var image not in this block

[tianrenheyi09]

for epoch_id in six.moves.range(1): run_iterable(train_prog, exe, train_loss, train_loader)

run_iterable(test_prog, exe, test_loss, test_loader)

fluid.io.save_inference_model(dirname="./modelm", feeded_var_names=['image'], target_vars=[train_loss], executor=exe)

[ronny1996]

你好，能贴一段可复现的代码吗？

[ronny1996]

你好，请设置一下save_inference_model的main_program参数

[tianrenheyi09]

多谢，添加main_program参数后，可以正常保存