BP神经网络，改进后的高等算法它的学习规则是使用最速下降法，通过反向传播来不断调整网络的权值和阈值，使网络的误差平方和最小。- BP neural network algorithm improved its higher learning rule is to use the steepest descent method, through a reverse spread to constantly adjust the network weights and thresholds, s

mpi多线程运用最速下降法求共轭梯度，16个线程，最多循环1000次。-mpi multi-threaded application steepest descent method the conjugate gradient, 16 threads, up to 1000 cycles.