Adding a new execution provider
- Create a folder under onnxruntime/core/providers
- Create a folder under include/onnxruntime/core/providers, it should has the same name as the first step.
- Create a new class, which must inherit from IExecutionProvider. The source code should be put in 'onnxruntime/core/providers/[your_provider_name]'
- Create a new header file under include/onnxruntime/core/providers/[your_provider_name]. The file should provide one function for creating an OrtProviderFactoryInterface. You may use 'include/onnxruntime/core/providers/cpu/cpu_provider_factory.h' as a template. You don't need to provide a function for creating AllocatorInfo.
- Put a symbols.txt under 'onnxruntime/core/providers/[your_provider_name]'. The file should contain all the function names that would be exported from you provider. Usually, just a single function for creating provider factory is enough.
- Add your provider in onnxruntime_providers.cmake. Build it as a static lib.
- Add one line in cmake/onnxruntime.cmake, to the 'target_link_libraries' function call. Put your provider there.
Using the execution provider
- Create a factory for that provider, by using the c function you exported in 'symbols.txt'
- Put the provider factory into session options
- Create session from that session option e.g.
OrtEnv* env; OrtInitialize(ORT_LOGGING_LEVEL_WARNING, "test", &env) OrtSessionOptions* session_option = OrtCreateSessionOptions(); OrtProviderFactoryInterface** factory; OrtCreateCUDAExecutionProviderFactory(0, &factory); OrtSessionOptionsAppendExecutionProvider(session_option, factory); OrtReleaseObject(factory); OrtCreateSession(env, model_path, session_option, &session);