#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;
    }
#vulnerable code 
                                float binaryLogistic(int target, boolean label, float lr) {
        float score = sigmoid(wo_.dotRow(hidden_, target));
        float alpha = lr * (label ? 1f : 0f - score);
        grad_.addRow(wo_, target, alpha);
        synchronized (this) {
            wo_.addRow(hidden_, target, alpha);
        }
        if (label) {
            return -log(score);
        } else {
            return -log(1.0f - score);
        }
    } 
                            #location 6 
                            #vulnerability type THREAD_SAFETY_VIOLATION