Dear Zafar Ali please click on the following link, May you will find some valuable here.

https://www.quora.com/How-do-we-get-item-profile-extract-item-feature-matrix-and-user-profile-users-preference-matrix-in-Content-based-recommender-systems-from-user-item-rating-matrix-which-algorithms-are-being-used-for-this-purpose

Thanks Islam Zada for posting and helping. It helped me a lot..

Dear Zafar Ali, you should use different features for item profile and user profile because their information is different.

Loc Nguyen,

But the approach used to represent a user or item profile must be the same in a system. For instance, if feature vector approach is used to represent user profile then feature vector approach must be used for item profile as well. What do u think, it should follow the same approach or different ?

Dear Zafar Ali, you can use programming technique. An abstract type can represent many features. For example, a numeric type can represent real number, integer. You can create a object-oriented programming class Feature that represent any kind of feature.

Loc Nguyen,

I don't want to go into the programming detail of these profiles but in Relational DB, how can we store and what kind of features we should store for both user and item. If we consider the domain of movies or any other product, what could be the possible feature which will build such profiles.?

Regards

Zafar Ali

Dear Zafar Ali, thank you very much for upvoting my answer. This is my biggest honor and happiness. In relational DB, each field has specific type.

Hi,

Please read this paper. May be it helps you.

http://ieeexplore.ieee.org/xpl/freeabs_all.jsp?arnumber=6727211&abstractAccess=no&userType=inst

Dear Zafar Ali, item profile contains information of products. User profile contains information of customers. Their features are different.

Thank Zafar Ali for upvoting my answer.

Loc Nguyen,

You are right but, user profile is developed using those items top rated or mostly viewed by that particular user. for instance, a user likes a movie having genre comedy, director john, actor peter etc. and user give 5 rating to this item then, profile of this user can be developed by considering this movie. for that, user profile must contain the same information i.e. genre he/she likes is comedy, director he likes is john and so on. the representation of both the profiles would be the same. I want your input for this.

Regards

Zafar Ali

Dear Zafar Ali, thank you for upvoting my answer.

Dear Zafar Ali, Hope this help I try to make as simple as possible:

you can use same set or different set it depends on what you may need in you recommender engine of recommender systems but when you want to recommend there are some differences, when you use items' properties your recommendation system would be item based but if you use user profile to find user preferences and according to those interest recommends then recommendation system is based on user profile.

for example there are several films with different rating and you want to recommend top films to a user then you can use films rating then recommend top rating films to users which he/she might not like those films. this is an item based system but if you use user profile and find that what kind of film (comedy, musical or etc) he/she watch then you can use this preferences and then use film rating then recommends those film with top rating which is in user's preferences. this is user profile based systems.

in fact one of the disadvantages of item based is that user interest doesn't matter but in user profile based it would be considered.

Hope it is useful