c++ - Boost.Python，如何从 C++ 数组返回一个 numpy 数组？

Question

我定义了一个 2d 和 3d C++ 数组

// ROW x COL
auto ** arr1 = (double **)malloc(ROW * sizeof(double *));
for (int i = 0; i < ROW; i++) arr1[i] = (double *)malloc(COL * sizeof(double));

// ROW x COL1 x COL2
auto *** arr2 = (double ***)malloc(ROW * sizeof(double **));
for (int i=0; i < ROW; i++) {
    arr2[i] = (double **)malloc(COL1 * sizeof(double *));
    for (int j=0; j < COL1; j++) {
        arr2[i][j] = (double *)malloc(COL2 * sizeof(double));
    }
}

如何使用低开销将这些数组转换为 numpy 数组Boost.Python？