onnxruntime/docs/reference/execution-providers/NNAPI-ExecutionProvider.md

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NNAPI	Execution Providers	Reference	5

NNAPI Execution Provider

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Android Neural Networks API (NNAPI) is a unified interface to CPU, GPU, and NN accelerators on Android.

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Minimum requirements

The NNAPI EP requires Android devices with Android 8.1 or higher, it is recommended to use Android devices with Android 9 or higher to achieve optimal performance.

Build NNAPI EP

For build instructions, please see the BUILD page.

Using NNAPI EP in C/C++

Ort::Env env = Ort::Env{ORT_LOGGING_LEVEL_ERROR, "Default"};
Ort::SessionOptions sf;
Ort::ThrowOnError(OrtSessionOptionsAppendExecutionProvider_Nnapi(sf));
Ort::Session session(env, model_path, sf);

The C API details are here.