collaborative-filteringrecommendation-engine

When to use user-user collaborative filtering and when to use Item-Item collaborative filtering?

I am confused when to use user-user collaborative filtering and when to use Item-Item collaborative filtering?

Please help!!

Solution

  • If you have more users than items in your dataset which is generally the case, it would be effective to use item-item collaborative filtering. eg: Amazon would have a huge base of customers as compared to products.

    Moreover the user preferences and liking changes over time so it is difficult to tackle this problem in user-user collaborative filtering but with item generally it is seen the rating of item doesn't change much over a course of time.