Pythonのnumpy arrayをC++で読み込むサンプル (参考:https://gist.github.com/rezoo/5656056, http://mglab.blogspot.jp/2014/03/numpyhpp-npy.html)

input_array.cpp

#include <iostream>
#include "numpy.hpp"

int main(void) {

  std::vector<int> s;              // Vetor for matrix size
  std::vector<int> int_data;       // Vector for matrix element

  aoba::LoadArrayFromNumpy("int_array.npy", s, int_data);

  std::cout << s[0] << " " << s[1] << std::endl;           // print matrix size (row * column)
  std::cout << int_data.size() << std::endl;               // print element size

  for (int x : int_data) {
    std::cout << x << " ";
  }

  std::cout << std::endl;

  std::vector<float> float_data;

  aoba::LoadArrayFromNumpy("float_array.npy", s, float_data);

  std::cout << s[0] << " " << s[1] << std::endl;
  std::cout << float_data.size() << std::endl;

  for (float x : float_data) {
    std::cout << x << " ";
  }

}

output_array.py

#!/usr/bin/env python

import numpy as np


def main():
    X = np.array([[1, 2, 3], [4, 5, 6]], dtype=np.intc)  # int array
    np.save('./int_array', X)

    X = np.array([[1.5, 2.2, 3.3], [4.5, 5.2, 6.8]], dtype=np.float32)  # float arary
    np.save('./float_array', X)


if __name__ == "__main__":
    main()