int m = 3;
int l = 4;
int k - 6;
std::vector<int> perceptrons;
for(int i = 0; i < k; i++){
    Perceptron Ki = Perceptron(m, l);
    perceptrons.push_back(Ki);
}

Main.cpp:102:33: error: no matching function for call to       ‘std::vector<int>::push_back(Perceptron&)’
     perceptrons.push_back(Ki);