为了记录在竞赛中入门深度学习的过程，我开了一个新系列【从传统方法到深度学习】。
1. 问题
Kaggle竞赛Bag of Words Meets Bags of Popcorn是电影评论（review）的情感分析，可以视作为短文本的二分类问题（正向、负向）。标注数据集长这样：
id sentiment review"2381_9" 1 "\"The Classic War of the Worlds\" by Timothy Hines is a very entertaining film that obviously goes to great effort and lengths to faithfully recreate H. G. Wells' classic book. Mr. Hines succeeds in doing so. ...""2486_3" 0 "What happens when an army of wetbacks, towelheads, and Godless Eastern European commies gather their forces south of the border? Gary Busey kicks their butts, of course. Another laughable example of Reagan-era cultural fallout, Bulletproof wastes a decent supporting cast headed by L Q Jones and Thalmus Rasulala."
评价指标是AUC。因此，在测试数据集上应该给出概率而不是类别；即为
延伸阅读
学习是年轻人改变自己的最好方式