Created by: AoZhang

• 环境 1）PaddlePaddle版本：1.6.2 2）CPU：Intel(R) Xeon(R) CPU E5-2620 v2 3）GPU：no 4）系统环境：CentOS 6.3 ，Python版本 3.6.5

• 问题描述 看报错信息像是save model时漏了数据，但是看不出来缺少的什么，“cannot determine missing fields for lite message”。review过代码，所有训练阶段read的变量都在 save_inference_model 阶段保存（feeded_var_names）了，请问这种情况下如何排查问题？

详细错误日志如下：

[libprotobuf ERROR /paddle/build/third_party/protobuf/src/extern_protobuf/src/google/protobuf/message_lite.cc:119] 
Can't parse message of type "paddle.framework.proto.ProgramDesc"
 because it is missing required fields:
 (cannot determine missing fields for lite message)
Traceback (most recent call last):
  File "script/text2sql_infer.py", line 67, in <module>
    predictor = Predictor(param_dict["predictor"], dataset, model)
  File "/xx/paddle_env/text2sql/textone/predict/predictor.py", line 30, in __init__
    self.init_env()
  File "/xxx/paddle_env/text2sql/textone/predict/predictor.py", line 43, in init_env
    self.predictor = create_paddle_predictor(config.to_native_config())
paddle.fluid.core_avx.EnforceNotMet:

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C++ Call Stacks (More useful to developers):
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0   std::string paddle::platform::GetTraceBackString<char const*>(char const*&&, char const*, int)
1   paddle::platform::EnforceNotMet::EnforceNotMet(std::__exception_ptr::exception_ptr, char const*, int)
2   paddle::framework::ProgramDesc::ProgramDesc(std::string const&)
3   paddle::inference::Load(paddle::framework::Executor*, paddle::framework::Scope*, std::string const&, std::string const&)
4   paddle::NativePaddlePredictor::Init(std::shared_ptr<paddle::framework::Scope>)
5   std::unique_ptr<paddle::PaddlePredictor, std::default_delete<paddle::PaddlePredictor> > paddle::CreatePaddlePredictor<paddle::NativeConfig, (paddle::PaddleEngineKind)0>(paddle::NativeConfig const&)
6   std::unique_ptr<paddle::PaddlePredictor, std::default_delete<paddle::PaddlePredictor> > paddle::CreatePaddlePredictor<paddle::NativeConfig>(paddle::NativeConfig const&)

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Error Message Summary:
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Error: Fail to parse program_desc from binary string. at (/paddle/paddle/fluid/framework/program_desc.cc:103)