改进的BP神经网络，因为目的是针对单一的时间序列进行预测，所以该算法没有进行归一化处理，经检验具有还不错的效果，并且附上了对序列进行处理以改变其维度的完整代码。-The improved BP neural network, because the purpose is for single time series forecast, so no normalized processing, the algorithm has a good effect after inspection, an