自定义实现C++拓展pytorch功能

ncrelu.cpp

#include <torch/extension.h>					// 头文件引用部分

namespace py = pybind11;

torch::Tensor ncrelu_forward(torch::Tensor input) {
    auto pos = input.clamp_min(0);				       // 具体实现部分
    auto neg = input.clamp_max(0);
    return torch::cat({pos, neg}, 1);
}

PYBIND11_MODULE(TORCH_EXTENSION_NAME, m) {	// 绑定部分
    m.def("forward", &ncrelu_forward, py::arg("input"), "NCReLU forward");
}

setup.py

from setuptools import setup
from torch.utils import cpp_extension


setup(
    name='ncrelu_cpp',
    version='1.0',# 编译后的链接库名称
    py_modules=['ncrelu_cpp'],
    ext_modules=[
        cpp_extension.CppExtension(
            'ncrelu_cpp', ['ncrelu.cpp'],
            extra_compile_args={'cxx': ['-O2']}
            # 待编译文件，及编译函数
        )
    ],
    cmdclass={						       # 执行编译命令设置
        'build_ext': cpp_extension.BuildExtension
    }
)

test.py

import torch
import ncrelu_cpp
import sys
print(sys.path)
a = torch.randn(4,3)
print(a)
b = ncrelu_cpp.forward(a)

python setup.py install

或pip install .

但是在Windows平台下不知道为什么会报错找不到包，或者找不到函数，很奇怪，但是正常运行没有任何问题