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“the wisdom of the few”
neal lathia
xavier amatriain, josep m. pujol, haewoon kwak, nuria oliver
tags:     internet group

       scalable
    p2p       advanced
                    social networks
  delay-tolerant
      performance
                  wireless
    applications             systems
             content-distribution


   pablo rodriguez, niko laoutaris, alberto lopez, josep m.
  pujol, domenico giustiniano, georgios siganos, xiao yang

         http://research.tid.es/internet/
tags:      multimedia group
                               mobility
               search hci
    recommender systems
context-awareness mobile apps
      multi-modal interfaces
  social networks activity recognition
                   emotion
    user modelling
nuria oliver, xavier amatriain, joachim neumann, xavier anguera,
      mauro cherubini, (jon froehlich, neal lathia, jiejun xu)


      http://research.tid.es/multimedia/
recommender systems:
      “help people find stuff”
source: O. Celma & P. Lamere “Music Recommendation Tutorial” ISMIR 2007
(one way is to use)
how? nearest neighbours
similarity-weighted average of neighbour ratings
(matrix perspective)

                       items




       users
similarity-weighted average of neighbour ratings
(matrix perspective)

                       items




       users
similarity-weighted average of neighbour ratings
(matrix perspective)

                       items




       users       x


                   x

                   x
items




 users




kNN suffers from (a number of) weaknesses!
items




 users




                               scalability


kNN suffers from (a number of) weaknesses!
items




 users



             sparsity



                               scalability


kNN suffers from (a number of) weaknesses!
items




 users


         noise & data quality
               sparsity



                                scalability


kNN suffers from (a number of) weaknesses!
what to do?


              items




users                 get more data!
what to do?


              items




                      users? (hard)
users
                      the web? (how?)
what to do?


              items




                           rottentomatoes.com
users




        netflixprize.com

                             flixster.com
how do they compare?


              items




users                  smaller, denser,
                       different std. dev, means
cross-dataset nearest-neighbours


              items




users       “crowds”               “experts”
cross-dataset nearest-neighbours


              items




users
cross-dataset nearest-neighbours


              items




                                   x
                                   x
users    x

                                   x
                                   x
cross-dataset nearest-neighbours


              items           weighted cosine similarity




                                     x
                                     x
users    x

                                     x
                                     x




                              pick experts with sim > x
                           introduce a confidence metric
does it work?
      “help people find stuff”
                prediction accuracy
parameters
compared to neighbours
does it work?
      “help people find stuff”
                prediction accuracy
             recommendation precision
                          user study
A classifier generates a
list of recommendations:
A classifier generates a
list of recommendations:

            TP
     P =
           TP+FP

True Positive (TP):
Prediction > r, Rating > r

False Positive (FP):
Prediction > r, Rating < r
A classifier generates a
list of recommendations:
does it work?
      “help people find stuff”
                prediction accuracy
             recommendation precision
                          user study
(one way is to use)
movies i like..
(one way is to use)
movies i don't like..
future: multi-source?
multi-source prediction




                          predict
multi-source prediction




                          best source?
multi-source prediction




  user-dependent: naïve predictors can
   perform extremely well if users are
       paired with correct source
          (data quality is important!)
“the wisdom of the few”
neal lathia
xavier amatriain, josep m. pujol, haewoon kwak, nuria oliver

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MobiSys Seminar - Nov 4 2008