When to use usercf and itemcf?

1. When to use UserCF, When to use ItemCF？ Why? ？

（1）UserCF

• Because it is Based on user similarity Make recommendations , So it has stronger Social characteristics , This feature is very suitable for user Less , There are many items , It has a strong timeliness The occasion of .

  • For example, news recommendation scenes , because The interest points of the news itself are scattered , Compared with users' interest and preference for different news , The timeliness of news , Hot spots are often more important , So it is suitable for discovering hot spots , Track the trend of hot spots .
  • In addition, it has the ability to recommend new information , More likely to find surprises , Because it looks at the similarity between people , The result may be more surprising , You can find potential interests of users that you haven't noticed yet .

（2）ItemCF

• This is more applicable to Interest changes are relatively stable Application , Closer to personalized recommendation , fit Few items , More users , User interest is fixed and lasting , Where the update speed of items is not too fast .
• For example, recommend Artwork , music , The movie .