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Recommender Systems

Anastasiia Kornilova
Agenda
General overview
Algorithms
Evaluation
Problems
We are overloaded of information:
• Books
• Movies
• News
• Blogs
• TV-channels
• Music
•…
As user:
•

•
•
•
•

•

Do we need all of this things?
No
Can we choose most appropriate of them?
Yes
How?
Recommender systems!
As Business Owner:
Do you need Recommender System?
•

Netflix:
•

•

Google News
•

•

2/3 rented movies are from recommendation
38 % more click-through are due to recommendation

Amazon
•

35% sales are from recommendation
•Celma & Lamere, ISMIR 2007
Domains of recommendations

Content to
Commerce

•
•
•
•
•
•
•
•

One
particularly
interesting
property

• New items (movies, books, news, ..)
• Re-recommend old ones (groceries,
music,…)

Information
News
Restaurants
Vendors
TV-programs
Courses in e-learning
People
Music playlists
Examples: Retail
Examples: Banking
Deposits:

Credit products:

Insurance:

Service packages:

Deposit 1

Credit card 1

Endowment

Premium package

Deposit 2

Credit card 2

Travel insurance

Personal loan 1
Personal loan 2

Consultant can be replaced by
Recommender System

Deposit 1
Personal
load 2

Travel
insurance

Travel
insurance

Customer 1

Credit
card 1

Premium
package

Customer 2
Examples: Hotels
Examples: Advertisement

Shopping
(browsing) history

RSE
Purposes of Recommendation
Recommendations themselves (Sales,
information)
Education of user/customer
Build a community of users/customers
around products or content
Whose Opinion?




“Experts”
Ordinary “phoaks”
People like you
Personalization Level
Generic/Non-Personalized: everyone
receives same recommendations
Demographic: matches a target
group
Ephemeral: matches current activity
Persistent: matches long-term
interests
Review

Rating

Explicit
input
based
RSE

Vote

Like
Purchase
Click

Follow
Implicit
input
based
RSE
Recommendation Algorithms
1. Non-Personalized Summary Statistics
2. Content-Based Filtering

Information Filtering

Knowledge-Based
3. Collaborative Filtering

User-user

Item-item

Dimensionality Reduction
4. Others

Critique / Interview Based Recommendations

Hybrid Techniques

Non-Personalized Recommender
Best-seller
Most popular
Trending Hot
Best-liked
People who X also Y
Personalized Recommender:
Collaborative Filtering





Use opinions of others to predict/recommend
User model – set of ratings
Item model – set of ratings
Common core: sparse matrix of ratings
Evaluation

Lift

Cross-sales

Up-sales

Conversions

Accuracy

Serendipity
Problems

New user

“Cold
start”

New item
New system

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Recommender systems