NN train

nn_train.cc

  do {
    err = 0;
    for(unsigned int i = 0; i < train_in_.size(); i++) {
      vector<double> res = this->learn(train_in_[i], train_out_[i]);
      /* error calculation */
      double e = 0;
      for(unsigned int j = 0; j < res.size(); j++) {
        e += pow(res[j] - train_out_[i][j], 2);
      }
      err += e / res.size();
    }
    err /= train_in_.size();
    it++;
    if(log_) {
      cout << "[" << it << "] " << err << endl;
    }
  } while(err > error && it < iterations);