octopus

leetcode. java/python for leetcode: 1) array，2) list，3) string，4) hashtable，5) math，6) tree

commonutils. java utils: 1) ArrayUtils 2) MapSortUtils 3) CollectionUtils

recommendation. recommendation algorithm 1) CF 2) ContentBased 3) Item2Vec 4) LFM 5)LR 6)PR 7) Tree 8) WD 9) MMOE

educationcurriculumnetwork. The course network is a comprehensive B2B2C platform. the back-end framework adopts spring + spring MVC + mybatis + Dubbo + zookeeper

pythonstudy. study python

librec. LibRec: A Leading Java Library for Recommender Systems, see