negative gradient造句

• But it has intrinsic defects such as low convergence and local minimum because the negative gradient method is adopted in weight adjusting . an improved rbf network is introduced which has the advantage in digital approximation , classification and learning rate and at the same time , the corresponding sensibility is also analysed
  但bp网络在用于函数逼近时，权值的调节采用的是负梯度下降法，这种调节方法有它的局限性，如收敛速度慢和容易陷入局部极小等缺点。