lundi 22 juillet 2019

Different pseudo random numbers between C++ and Python implementations

I am trying to reproduce the C++ code into Python 3.6, but the sequence of pseudo random numbers is different in each implementation. The seed are the same on both implementation and as far as I know, both use Mersenne Twister algorithm.

What am I doing wrong?

C++:

#include <random>
#include <iostream>
int main(int argc, char* argv[])
{  
    std::mt19937 gen(2);
    std::uniform_int_distribution<> dis(0, 61);

    for (int n=0; n<10; ++n)
        std::cout << dis(gen) << ' ';

    return 0;
}

Python 3.6:

import numpy as np
rng = np.random.RandomState(2)
for i in range(10):
    print(str(rng.randint(0, 62)))

Note: randint has an exclusive upper bound. That is why I use 61 on C++ code, but 62 on Python code.




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