Here, a user receives suggestions for people he might know based on his social context.In this case the setting is symmetric, as there is no distinction between the type of the object that is recommended and the one that receives the recommendation (both are users).SUMMARY ================================================================================ These files contain 17,359,346 anonymous ratings of 168,791 profiles made by 135,359 Libim Se Ti users as dumped on April 4, 2006.
If we consider homophily among the users as an important factor, the recommendation in this scenario corresponds to predicting a relation of the type similar between two sub- jects.
There are however settings which lie at the intersection of those two scenarios.
The recommendation of objects occurs, for instance, in online shops where a user receives suggestions for other interesting products based on his con- text.
In this case the world of recommendations is asym- Permission to make digital or hard copies of all or part of this work for personal or classroom use is granted without fee provided that copies are not made or distributed for profit or commercial advantage and that copies bear this notice and the full citation on the first page.
However, in the classical setting the users might be more interested in getting to know people of the respective other gender.
Thus, we have an asymmetry in the scenario as we typically would not recommend women to women nor men to men.
To copy otherwise, to republish, to post on servers or to redistribute to lists, requires prior specific permission and/or a fee. Copyright 2012 ACM 978-1-4503-1638-5/12/09 ....00. DISSIMILAR LIKE DISLIKE SIMILAR Figure 1: The four kinds of relationships modeled in our approach: Like, dislike, similarity and dissim- ilarity.
metric and clearly divided into those who receive a recom- mendation (the user) and that what is recommended (the product).
Hence, we are also dealing with the prediction of relation of type taste between different types of users (i.e., men and women).