Recommender Systems in TEL

Recommender Systems in TEL Nikos Manouselis Greek Research & Technology Network (GRNET) nikosm@ieee.org

about me ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

(promised)aim of this lecture ,[object Object],[object Object],[object Object]

(actual)aim of this lecture ,[object Object]

structure ,[object Object],[object Object],[object Object],[object Object],[object Object]

lets ask some friend ,[object Object],“ You will definitely like it” “ Maybe not, the scenario is too weak”

lets ask some friend ,[object Object]

… so, which movie? ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

[object Object],[object Object],[object Object],[object Object],definition (1/2)

definition (2/2) ,[object Object],[object Object],[object Object],[object Object]

why do we need them? ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

wait a second ,[object Object]

tasks usually supported ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

1. annotation in context ,[object Object],[object Object],[object Object]

annotation in context ,[object Object]

2. find good items ,[object Object],[object Object],[object Object]

find good items ,[object Object]

3. find all good items ,[object Object],[object Object],[object Object]

4. sequence of items ,[object Object],[object Object]

and what about TEL? ,[object Object],[object Object],[object Object]

break2think ,[object Object],[object Object],[object Object]

typical classification ,[object Object],[object Object],[object Object],[object Object]

example: collaborative filtering

generally speaking: some user ,[object Object],[object Object],[object Object]

generally speaking: some items ,[object Object],[object Object],[object Object]

generally speaking: a mechanism ,[object Object],[object Object]

rings some bell? ,[object Object],[object Object]

a generic architecture [Karampiperis & Sampson, 2005]

an example [Karampiperis & Sampson, 2005]

[object Object],classification/analysis

recommend in TEL based on what? ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

evaluating recommendation ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

typical results means that a prediction could be 4,6 stars instead of 4 or 5 … does this really matter in TEL?

other issues ,[object Object],[object Object],[object Object],[object Object]

metrics (popular) ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

metrics (not popular) ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

evaluation in TEL recommenders ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

example: Altered Vista ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

another look at it ,[object Object],[object Object],[object Object],[object Object],[object Object]

what else could be evaluated? ,[object Object],[object Object]

basic conclusion ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

interesting (?) issues ,[object Object],[object Object],[object Object],[object Object],[object Object]

but do they exist?? ,[object Object]

interested in more? ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Recommender Systems in TEL

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