采用动量梯度下降算法训练 BP 网络，输入矢量和目标矢量-Using momentum gradient descent algorithm to train the BP network

火车票抢购源码，思路供参考，因12306更新快，所以不一定适用。-Train tickets to buy source, train of thought for reference, due to the 12306 update fast, so it does not necessarily apply.

The project is to determine how much a particular factor influences on the helpfulness of a review. We extracted features like polarity, rating, average word length, helpfulness ratio the collected amazon data. We used gradient boosting classifie