Recommender Systems Concepts and Challenges

What is the main purpose of a recommender system?

• To create new movies

• To help people find new things based on information and social ratings

• To store large amounts of data

• To translate languages

Which programming language and tool are used to build the movie recommender system?

• Java and Eclipse

• C++ and Visual Studio

• Python and Google Colaboratory

• Ruby and GitHub

To get more reliable generic movie recommendations, what step did the presenter take after noticing many movies had perfect 5.0 ratings from only one person?

• He asked his friend John Greenbot for his opinion

• He filtered the movies to include only those with at least a certain number of ratings

• He removed all movies with a 5.0 rating

• He changed the rating scale from 1-5 to 1-10

What is the "cold-start problem" for a recommender system?

• The system recommends movies that are too old

• The system cannot make personalized recommendations without enough user data

• The system takes too long to load

• The system recommends movies that are not popular

What is the primary purpose of the AI being programmed?

• To categorize movies by genre

• To provide personalized movie recommendations

• To analyze movie production budgets

• To create new movie scripts

What is a likely outcome when the AI uses a small neighborhood size for recommendations?

• It will recommend only very popular movies

• It will suggest more surprising or obscure movies

• It will consider many people with diverse tastes

• It will have more data to make accurate predictions

What is a likely outcome when the AI uses a large neighborhood size for recommendations?

• It will recommend movies tailored to individual interests

• It will suggest movies that are generally popular and widely known

• It will have less data to make predictions

• It will only consider people with very similar movie tastes

When creating a combined "Jabril-Green-Bot Hybrid" profile, how are ratings for a movie handled if both Jabril and John-Green-Bot have rated it?

• The higher of the two ratings is chosen

• The lower of the two ratings is chosen

• The average of their ratings is used

• The movie is excluded from the recommendations