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ucloud

牛客网-随身云时间黑客大数据挖掘比赛

说明

(1)比赛链接:http://www.nowcoder.com/activity/calendar

(2)仅上传部分代码

比赛思路

(1)选取建模用户(仅对互动率高的小部分用户进行建模)

(2)建模思路:先判断有无行为,然后判断该行为是赞或者踩;由于大部分用户行为比较一致,所以后者可直接统计判断

(3)有无行为建模:样本不均衡的二分类问题,时间衰减采样

(4)特征设计:用户特征 + 帖子特征 + 交互特征

(5)模型选择:rf + gbdt

(6)模型融合:软投票(计算平均概率值)

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