我试图用pybind11
和cppimport
包装一个使用Armadillo库的c++函数。但是当我尝试做一些简单的事情,比如矩阵乘法,我得到了以下错误。在
error: no matching function for call to ‘pybind11::buffer_info::buffer_info(double*, long unsigned int, std::__cxx11::string, int, <brace-enclosed initializer list>, <brace-enclosed initializer list>)’
);
^
In file included from /home/muah/anaconda3/envs/ising/include/python3.6m/pybind11/pytypes.h:13:0,
from /home/muah/anaconda3/envs/ising/include/python3.6m/pybind11/cast.h:13,
from /home/muah/anaconda3/envs/ising/include/python3.6m/pybind11/attr.h:13,
from /home/muah/anaconda3/envs/ising/include/python3.6m/pybind11/pybind11.h:43,
from /home/muah/Music/cpp2py/.rendered.code.cpp:3:
/home/muah/anaconda3/envs/ising/include/python3.6m/pybind11/buffer_info.h:83:5: note: candidate: pybind11::buffer_info::buffer_info(pybind11::buffer_info::private_ctr_tag, void*, pybind11::ssize_t, const string&, pybind11::ssize_t, pybind11::detail::any_container<long int>&&, pybind11::detail::any_container<long int>&&)
buffer_info(private_ctr_tag, void *ptr, ssize_t itemsize, const std::string &format, ssize_t ndim,
^~~~~~~~~~~
/home/muah/anaconda3/envs/ising/include/python3.6m/pybind11/buffer_info.h:83:5: note: candidate expects 7 arguments, 6 provided
/home/muah/anaconda3/envs/ising/include/python3.6m/pybind11/buffer_info.h:59:5: note: candidate: pybind11::buffer_info::buffer_info(pybind11::buffer_info&&)
buffer_info(buffer_info &&other) {
这是犰狳垫和纽比之间的转换代码,反之亦然。在
^{pr2}$这是c++函数:
<%
cfg['compiler_args'] = ['-std=c++11', '-larmadillo']
setup_pybind11(cfg)
%>
#include <pybind11/pybind11.h>
#include <pybind11/numpy.h>
#include <armadillo>
#include "py2arma.hpp"
namespace py = pybind11;
py::array matrix_mul(pyarr_d a, pyarr_d b)
{
arma::mat A = py_to_mat(a);
arma::mat B = py_to_mat(b);
arma::mat C = A * B;
return mat_to_py(C);
}
PYBIND11_PLUGIN(code)
{
py::module m("code", "lala");
m.def("matrix_mul",(py::array(*)(pyarr_d,pyarr_d))&matrix_mul);
return m.ptr();
}
这是python函数:
import cppimport
import numpy as np
code = cppimport.imp("code")
if __name__ == '__main__':
xs = np.random.rand(3,3)
ys = np.random.rand(3,1)
py_mul = np.dot(xs, ys)
cpp_mul = code.matrix_mul(xs, ys)
print(py_mul)
print(cpp_mul)
此链接包含完整的堆栈跟踪:https://pastebin.com/XuKyQDMQ
我不明白这个错误意味着什么。如何解决这个问题,我是否正确地进行了转换?在
编辑:要解决这些问题,请在matrix shape之前添加py::detail::any_container,并跨步缓冲区信息的一部分。并将mat_to_py
函数的类型从py::array
更改为pyarr_d
。在
这修复了代码的所有问题。在
从上述注释的跟踪来看,这似乎是由于您的回溯(第59行)中的这段代码:
/home/muah/anaconda3/envs/ising/include/python3.6m/pybind11/buffer_info.h:28:5: note: candidate: pybind11::buffer_info::buffer_info(void*, pybind11::ssize_t, const string&, pybind11::ssize_t, pybind11::detail::any_container<long int>, pybind11::detail::any_container<long int>) buffer_info(void *ptr, ssize_t itemsize, const std::string &format, ssize_t ndim, ^~~~~~~~~~~ /home/muah/anaconda3/envs/ising/include/python3.6m/pybind11/buffer_info.h:28:5: note: no known conversion for argument 6 from ‘<brace-enclosed initializer list>’ to ‘pybind11::detail::any_container<long int>’
我的建议是,首先为这些参数显式地构造
py::any_container<size_t>(...)
,这将帮助您缩小推理出错的范围。也许是因为犰狳的尺寸与ssize_t
之间的不匹配?在相关问题 更多 >
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