Zeno Gantner: Created page with "Recommender systems that are biased towards generally popular items exhibit the so-called '''Harry Potter effect'''. Almost everybody likes Harry Potter. While it..."

2012-12-07T10:44:47Z

Created page with "Recommender systems that are biased towards generally popular items exhibit the so-called '''Harry Potter effect'''. Almost everybody likes Harry Potter. While it..."

New page

[[Recommender system]]s that are [[bias]]ed towards generally popular [[item]]s exhibit the so-called '''Harry Potter effect'''.

Almost everybody likes Harry Potter.
While it is generally correct that users often like globally popular items, recommending them is usually not interesting.

To avoid the Harry Potter effect, items can be filtered or weighted down based on their global [[popularity]].

== External links ==
* [http://bickson.blogspot.de/2012/09/harry-potter-effect-on-recommendations.html blog post] by [[Danny Bickson]]
* [http://stackoverflow.com/questions/13757489/how-to-generate-recommendation-with-matrix-factorization StackOverflow question related to the Harry Potter effect]

Harry Potter effect - Revision history

Zeno Gantner: Created page with "Recommender systems that are biased towards generally popular items exhibit the so-called '''Harry Potter effect'''. Almost everybody likes Harry Potter. While it..."