尝试将 ML onnx 模型合并到 Android 应用程序

Trying to incorporate ML onnx model to Android App

我有一个经过训练的 onnx 模型,我想将其合并到 android 应用程序中。 我实际上正在从事一个 uni 项目,结合 ML 和 Android 开发。

经过长时间的研究,由于我不想使用 python 私有 REST API,我得出的结论是有两种方法可以从这里继续:我可以要么尝试将我的 onnx 模型转换为 TF 模型,然后通过 TFLite Converter API 生成 TFLite 模型,要么尝试使用 onnxruntime.

我尝试使用 TFLite 的第一种方法,使用 this post 的答案,因此代码:

import onnx

from onnx_tf.backend import prepare

onnx_model = onnx.load("input_path")  # load onnx model
tf_rep = prepare(onnx_model)  # prepare tf representation
tf_rep.export_graph("output_path")  # export the model

但我陷入了从 .onnx 到 .pb 的第一次转换,因为我认为 onnx-tf 不支持动态维度(我的模型有)。我不断得到一个 "Input size (depth of inputs) must be accessible via shape inference,"RuntimeError: Node name is not unique in your model. Please recreate your model with unique node name. 和类似的错误。

我也用 onnxruntime 尝试过,但我似乎无法设法“为 Android 创建最小构建,并支持 NNAPI”。我在构建时遇到此错误:

[1/67] Building CXX object CMakeFiles/libprotobuf.dir/C_/Users/chris/onnxruntime/cmake/external/protobuf/src/google/protobuf/io/io_win32.cc.obj
FAILED: CMakeFiles/libprotobuf.dir/C_/Users/chris/onnxruntime/cmake/external/protobuf/src/google/protobuf/io/io_win32.cc.obj
C:\PROGRA~2\CODEBL~1\MinGW\bin\C__~1.EXE -DGOOGLE_PROTOBUF_CMAKE_BUILD -DHAVE_PTHREAD -I. -IC:/Users/chris/onnxruntime/cmake/external/protobuf/src -std=c++11 -MD -MT CMakeFiles/libprotobuf.dir/C_/Users/chris/onnxruntime/cmake/external/protobuf/src/google/protobuf/io/io_win32.cc.obj -MF CMakeFiles\libprotobuf.dir\C_\Users\chris\onnxruntime\cmake\external\protobuf\src\google\protobuf\io\io_win32.cc.obj.d -o CMakeFiles/libprotobuf.dir/C_/Users/chris/onnxruntime/cmake/external/protobuf/src/google/protobuf/io/io_win32.cc.obj -c C:/Users/chris/onnxruntime/cmake/external/protobuf/src/google/protobuf/io/io_win32.cc
C:/Users/chris/onnxruntime/cmake/external/protobuf/src/google/protobuf/io/io_win32.cc: In function 'int google::protobuf::io::win32::stat(const char*, google::protobuf::io::win32::_stat*)':
C:/Users/chris/onnxruntime/cmake/external/protobuf/src/google/protobuf/io/io_win32.cc:315:40: error: cannot convert 'google::protobuf::io::win32::_stat*' to '_stat*' for argument '2' to 'int _wstat(const wchar_t*, _stat*)'
   return ::_wstat(wpath.c_str(), buffer);
                                        ^
In file included from C:/Users/chris/onnxruntime/cmake/external/protobuf/src/google/protobuf/io/io_win32.cc:52:0:
C:/Users/chris/onnxruntime/cmake/external/protobuf/src/google/protobuf/io/io_win32.h:75:51: note: class type 'google::protobuf::io::win32::_stat' is incomplete
 PROTOBUF_EXPORT int stat(const char* path, struct _stat* buffer);
                                                   ^
C:/Users/chris/onnxruntime/cmake/external/protobuf/src/google/protobuf/io/io_win32.cc: In function 'FILE* google::protobuf::io::win32::fopen(const char*, const char*)':
C:/Users/chris/onnxruntime/cmake/external/protobuf/src/google/protobuf/io/io_win32.cc:337:10: error: '::_wfopen' has not been declared
   return ::_wfopen(wpath.c_str(), wmode.c_str());
          ^
[6/67] Building CXX object CMakeFiles/libprotobuf.dir/C_/Users/chris/onnxruntime/cmake/external/protobuf/src/google/protobuf/message_lite.cc.obj
ninja: build stopped: subcommand failed.
Traceback (most recent call last):
  File "C:\Users\chris\onnxruntime\tools\ci_build\build.py", line 2023, in <module>
    sys.exit(main())
  File "C:\Users\chris\onnxruntime\tools\ci_build\build.py", line 1918, in main
    cmake_path, source_dir, build_dir, args)
  File "C:\Users\chris\onnxruntime\tools\ci_build\build.py", line 1673, in build_protoc_for_host
    run_subprocess(cmd_args)
  File "C:\Users\chris\onnxruntime\tools\ci_build\build.py", line 544, in run_subprocess
    return run(*args, cwd=cwd, capture_stdout=capture_stdout, shell=shell, env=my_env)
  File "C:\Users\chris\onnxruntime\tools\python\util\run.py", line 44, in run
    env=env, shell=shell)
  File "C:\Users\chris\AppData\Local\Programs\Python\Python37\lib\subprocess.py", line 512, in run
    output=stdout, stderr=stderr)
subprocess.CalledProcessError: Command '['C:\Program Files\CMake\bin\cmake.EXE', '--build', 'C:\Users\chris\onnxruntime\\build\Windows\host_protoc', '--config', 'Release', '--target', 'protoc']' returned non-zero exit status 1.

我是不是走错了路?这是我第一次尝试将 ML 与 Android 相结合,所以我没有这方面的经验。非常欢迎任何建议。

对于 onnxruntime 的问题,请尝试更改 CMakeCache.txt :

CMAKE_CXX_FLAGS:STRING=-U__STRICT_ANSI__

它应该可以修复您提到的错误。我认为您在 onnxruntime 的道路上是正确的。