Question
The ProblemRecommender systems help people find items of interest by making personalized recommendations accord-ing to their preferences. For example, a recommender system can make personalized
The ProblemRecommender systems help people find items of interest by making personalized recommendations accord-ing to their preferences. For example, a recommender system can make personalized recommendations ofitems such as movies, books, hotels, or music to people. In order to model users preferences their pastinteractions such as product views, ratings, and purchases are used. In the recommender systems areaof research (which is a subfield of machine learning and information retrieval) different algorithms havebeen developed which are currently being used by many large companies.In this project you will implement neighborhood based collaborative filtering (NBCF) algorithms inorder to make predictions for movie ratings of people. There are two main types of NBCF algorithms:user-based (UBCF) and item-based (IBCF). Let us describe each with an example dataset.
One of the fundamental problems in recommender systems is to predict the rating of a user for a particularitem. For example, given the dataset in Table 1, what might be the rating of User 2 for Movie 3? If we can predict this rating then, if it is a high value like 4 or 5, we can decide to recommend Movie 3 to User 2.
In its simplest form, UBCF works as follows: in order to predict the rating of user u to itemi, we first find the most similar k users to u(who rated i) and predict the rating as the average ratings of these most similar k users on itemi. For finding the similarity between two users different methods canbe used. In collaborative filtering we look at the ratings of other users and find users which have similar ratings.
Gradings: Reading the input file and correctly printing the top 10 users and top 10 movies in decreasing order of number of ratings that they have.
Successfully applying the UBCF or IBCF, making a submission to Kaggle web site, andgettingRM SE <1.0. Note that choosing efficient data structure and algorithms and having lowerrunning times will also be considered. Teams with the same RMSE score can get different pointsdepending on the data structures and algorithms they implement.
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