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I wrote keras2cpp https://github.com/pplonski/keras2cpp

It transforms keras + theano models into pure C++, no additional packages. It is not using GPU.

A similar idea but for neural networks is by using TVM [1]. It's built on top of Halide and LLVM. I haven't tried it myself, but it seems to support deployment to many backends.

[1] https://docs.tvm.ai/deploy/index.html

Try Yolo: https://pjreddie.com/darknet/yolo/ . It's written in C.

There’s a project that compiles ONNX models: https://onnc.ai