test.cu:
int main(){
    Py_Initialize();
    std::vector<double> yy = {3, 5, 1, 4, 2};
    std::vector<double> xx = {1,2,3,4,5};
    pltDrawFigure(xx, yy);
    Py_Finalize();
}

void pltDrawFigure(const std::vector<double> & xx, const std::vector<double> & yy){
    PyRun_SimpleString("import sys");
    PyRun_SimpleString("sys.path.append('../python/')");
    PyObject * pModule = PyImport_ImportModule("eva");
    if (!pModule) {
        printf("import python failed1!!\n");
        return;
    }
    PyObject * pFunction = PyObject_GetAttrString(pModule, "drawFigure");
    if (!pFunction) {
        printf("get python function failed!!!\n");
        return;
    }
    auto size = xx.size();
    PyObject* pylist_x = PyList_New(size);
    PyObject* pylist_y = PyList_New(size);
    
    for (size_t i = 0; i < size; ++i) {
        PyObject *pyitemx = PyLong_FromLong(xx[i]);
        PyObject *pyitemy = PyLong_FromLong(yy[i]);

        if (PyList_SetItem(pylist_x, i, pyitemx) != 0) {
            PyErr_Print();
            std::cerr << "Failed to set item in PyList" << std::endl;
            Py_DECREF(pyitemx); 
            Py_DECREF(pylist_x); 
            return;
        }
        if (PyList_SetItem(pylist_y, i, pyitemy) != 0) {
            PyErr_Print();
            std::cerr << "Failed to set item in PyList" << std::endl;
            Py_DECREF(pyitemy); 
            Py_DECREF(pylist_y);
            return;
        }
    }
    PyObject *pArgs = PyTuple_New(2);
    PyTuple_SetItem(pArgs, 0, pylist_x);
    PyTuple_SetItem(pArgs, 1, pylist_y);

    PyObject_CallObject(pFunction, pArgs);

    Py_DECREF(pFunction);
    Py_DECREF(pModule);
}

CmakeLists.txt:
cmake_minimum_required(VERSION 3.23)
project(LightSim_Eva_Zhu)
set(CMAKE_CUDA_STANDARD 17)
find_package(CUDA REQUIRED)
include_directories("/home/wbt/openlibs/eigen-3.4.0/include/eigen3")
find_package(OpenCV REQUIRED PATHS /home/wbt/openlibs/opencv-4.5.5)
include_directories(${OpenCV_INCLUDE_DIRS})
#method1
#include_directories(/home/wbt/anaconda3/envs/piq/include/python3.12)
#LINK_DIRECTORIES(/home/wbt/anaconda3/envs/piq/lib) 
#LINK_LIBRARIES(python3.12)
#method2
set(Python3_EXECUTABLE "/home/wbt/anaconda3/envs/piq/bin/python")
set(Python3_INCLUDE_DIR "/home/wbt/anaconda3/envs/piq/include/python3.12")
set(Python3_LIBRARY "/home/wbt/anaconda3/envs/piq/lib/libpython3.12.so")
INCLUDE_DIRECTORIES(${Python3_INCLUDE_DIR})

cuda_add_executable(LightSim_Eva_Zhu test.cu #otherscripts)
target_link_libraries( LightSim_Eva_Zhu ${OpenCV_LIBS} ${Python3_LIBRARY})

eva.py:
import matplotlib.pyplot as plt

def drawFigure(x, y):
    print(x)
    print(y)
    plt.plot(x, y, marker='o')

    plt.title("f-loss")
    plt.xlabel("f")
    plt.ylabel("loss")
    plt.grid(True)
    plt.savefig('../Output Pictures/fig.png')