bp 网络,用动量及自适应IrBP的梯度递减训练函数traingdx由于有梯度的自适应的梯度递减训练和附加动量项，因此对样本容量有限的问题能够较好的训练-bp network, the training function decreasing with momentum and adaptive IrBP, gradient traingdx decreasing gradient adaptive gradient training and additional momentum term,