#vulnerable code 
                                List<Pair> predict(int[] input,
                 int k,
                 Vector hidden,
                 Vector output) {
        assert (k > 0);
        computeHidden(input, hidden);
        PriorityQueue<Pair> heap = new PriorityQueue<>(k+1, PAIR_COMPARATOR);
        if (args_.loss == Args.loss_name.hs) {
            dfs(k, 2 * osz_ - 2, 0.0f, heap, hidden);
        } else {
            findKBest(k, heap, hidden, output);
        }
        List<Pair> result = new ArrayList<>(heap);
        Collections.sort(result);
        return  result;
    } 
                            #location 6 
                            #vulnerability type THREAD_SAFETY_VIOLATION
#fixed code
                                Model(Matrix wi,
          Matrix wo,
          Args args,
          int seed) {
        hidden_ = new Vector(args.dim);
        output_ = new Vector(wo.m_);
        grad_ = new Vector(args.dim);
        random = new Random(seed);
        wi_ = wi;
        wo_ = wo;
        args_ = args;
        isz_ = wi.m_;
        osz_ = wo.m_;
        hsz_ = args.dim;
        negpos = 0;
        loss_ = 0.0f;
        nexamples_ = 1;
    }