relu.cpp

vector <float> relu(const vector <float>& z){
    int size = z.size();
    vector <float> output;
    for( int i = 0; i < size; ++i ) {
        if (z[i] < 0){
            output.push_back(0.0);
        }
        else output.push_back(z[i]);
    }
    return output;
}