MULTIMEDIA COURSE:                                  MUSIC                                  Sten GovaertsSaturday 26 Februa...
Saturday 26 February 2011
Saturday 26 February 2011
Saturday 26 February 2011
Saturday 26 February 2011
Katholieke             Universiteit LeuvenSaturday 26 February 2011
LeuvenSaturday 26 February 2011
...NOW LET’S GET TO                                 BUSINESS!Saturday 26 February 2011
Without music life                            would be a mistake.                    T                                    ...
YET ANOTHER PROBLEM?             Bartender      DJ     CustomersSaturday 26 February 2011
YET ANOTHER PROBLEM?             Bartender      DJ     CustomersSaturday 26 February 2011
YET ANOTHER PROBLEM?             Bartender      DJ     CustomersSaturday 26 February 2011
YET ANOTHER PROBLEM?             Bartender      DJ     CustomersSaturday 26 February 2011
YET ANOTHER PROBLEM?             Bartender      DJ     CustomersSaturday 26 February 2011
YET ANOTHER PROBLEM?             Bartender      DJ     CustomersSaturday 26 February 2011
YET ANOTHER PROBLEM?             Bartender      DJ     CustomersSaturday 26 February 2011
YET ANOTHER PROBLEM?             Bartender      DJ     CustomersSaturday 26 February 2011
YET ANOTHER PROBLEM?             Bartender      DJ     CustomersSaturday 26 February 2011
YET ANOTHER PROBLEM?             Bartender           DJ       Customers                            what we do!Saturday 26 ...
YET ANOTHER PROBLEM?             Bartender           DJ       Customers                            what we do!    HAPPY!Sa...
YET ANOTHER PROBLEM?             Bartender           DJ       Customers               business     what we do!    HAPPY!  ...
WHY LIKE THIS?Saturday 26 February 2011
WHY LIKE THIS?                   • how    does an expert select his music?Saturday 26 February 2011
WHY LIKE THIS?                   • how    does an expert select his music?                   • how    does a bartender sel...
WHY LIKE THIS?                   • how    does an expert select his music?                   • how    does a bartender sel...
WHY LIKE THIS?                   • how    does an expert select his music?                   • how    does a bartender sel...
EXPERTS @ WORK                            songs   param.   value   matchesSaturday 26 February 2011
EXPERTS @ WORK                            songs   param.   value   matchesSaturday 26 February 2011
EXPERTS @ WORK                            songs   param.   value   matchesSaturday 26 February 2011
EXPERTS @ WORK                            songs   param.   value   matchesSaturday 26 February 2011
EXPERTS @ WORK                            songs   param.   value   matchesSaturday 26 February 2011
THE SCHEMESaturday 26 February 2011
THE SCHEMESaturday 26 February 2011
THE SCHEMESaturday 26 February 2011
TROUBLE IN EXPERT LANDSaturday 26 February 2011
TROUBLE IN EXPERT LANDSaturday 26 February 2011
TROUBLE IN EXPERT LANDSaturday 26 February 2011
LET’S CREATE A CONTEXT!Saturday 26 February 2011
LET’S CREATE A CONTEXT!                            subgenre: easy listening, pop café                                   po...
contextSaturday 26 February 2011
context                            subcontext ASaturday 26 February 2011
context                            subcontext A                               songs with                   subgenre(easy l...
context                            subcontext A                               songs with                   subgenre(easy l...
context                            subcontext A                               songs with                   subgenre(easy l...
context                            subcontext A               subcontext B                               songs with       ...
context                            subcontext A               subcontext B                               songs with       ...
context                            subcontext A               subcontext B                               songs with       ...
context                            subcontext A                 subcontext B                               songs with     ...
context                            subcontext A                 subcontext B                               songs with     ...
WHAT’S UNDER THE HOOD?Saturday 26 February 2011
WHAT’S UNDER THE HOOD?Saturday 26 February 2011
WHAT’S UNDER THE HOOD?Saturday 26 February 2011
WHAT’S UNDER THE HOOD?Saturday 26 February 2011
WHAT’S UNDER THE HOOD?Saturday 26 February 2011
HTTP://WWW.TUNIFY.COMSaturday 26 February 2011
HTTP://WWW.TUNIFY.COMSaturday 26 February 2011
HTTP://WWW.TUNIFY.COMSaturday 26 February 2011
WHAT’S NEXT?...    • manually              annotated metadata    •5    music experts at Aristo Music and        different ...
THE LONG TAIL                            http://en.wikipedia.org/wiki/Long_TailSaturday 26 February 2011
THE LONG TAIL                            http://en.wikipedia.org/wiki/Long_TailSaturday 26 February 2011
THE LONG TAIL                            http://en.wikipedia.org/wiki/Long_TailSaturday 26 February 2011
OTHER PROBLEMS...    • satisfyingthe music choice of all        customers         • retail and catering differ from you   ...
GENERATE THE METADATA    • from            different sources:         • the audio signal         • web sources         • t...
Saturday 26 February 2011
TWO TECHNIQUES              • Genre              • Country      of OriginSaturday 26 February 2011
GENRE...                            http://techno.org/electronic-music-guide/    • our         master thesis looked at dif...
GENRESaturday 26 February 2011
GENRESaturday 26 February 2011
GENRESaturday 26 February 2011
GENRESaturday 26 February 2011
CLASSIFICATION WITH                          SEARCH ENGINES                             using co-occurrenceSaturday 26 Feb...
CLASSIFICATION WITH                          SEARCH ENGINES                             using co-occurrenceSaturday 26 Feb...
CLASSIFICATION WITH                          SEARCH ENGINES                              using co-occurrence              ...
CLASSIFICATION WITH                          SEARCH ENGINES                              using co-occurrence              ...
CLASSIFICATION WITH                          SEARCH ENGINES                              using co-occurrence              ...
CLASSIFICATION WITH                          SEARCH ENGINES                              using co-occurrence              ...
Saturday 26 February 2011
Rock:               Jazz:        Blues:               Pop:        Country:            Metal:Saturday 26 February 2011
Rock:                       Jazz:                            0,013            0,013        Blues:                       Po...
HOW TO EVALUATE THIS?    • run         an experiment         • evaluate          on 1995 artists and 9 genres.    • differ...
THE DATA SET                                   Blues   Country   Electronic                                   Folk    Jazz...
THE DATA SET                                        Blues   Country   Electronic                                        Fo...
THE DATA SET                                   Blues   Country   Electronic                                   Folk    Jazz...
Saturday 26 February 2011
MOTION CHART    • http://hmdb.cs.kuleuven.be/muzik/gapminder.htmlSaturday 26 February 2011
Saturday 26 February 2011
Saturday 26 February 2011
MORE FINE-GRAINED...    • 18        artists    • more     search engines: Google.co.uk/.fr/.be, uk/        fr.search.yahoo...
2 Pac            Rap                              Alan Lomax         Folk                              Art Pepper         ...
Saturday 26 February 2011
MAIN SEARCH ENGINE                              RESULTSSaturday 26 February 2011
REGIONAL GOOGLESSaturday 26 February 2011
Saturday 26 February 2011
WHAT TO USE?    • use         Google when it’s stable else rely on Yahoo!    • when             is it stable? test with a ...
DEMO METADATA                             GENERATION    • http://ariadne.cs.kuleuven.be/samgi-service/Saturday 26 February...
COUNTRY OF ORIGINSaturday 26 February 2011
MASHUPSSaturday 26 February 2011
MASHUPS    • mashups      in music: re-mixing multiple existing songs to        create a new one.Saturday 26 February 2011
MASHUPS    • mashups      in music: re-mixing multiple existing songs to        create a new one.    •a   mashup is an app...
MASHUPS    • mashups      in music: re-mixing multiple existing songs to        create a new one.    •a   mashup is an app...
MY MUSIC MASHUP.    • http://www.cs.kuleuven.be/~sten/lastonamfm/Saturday 26 February 2011
COUNTRY & CONTINENT       • why           is it useful?            • subgenres            • popularity            • recomm...
COUNTRY & CONTINENT       • why           is it useful?            • subgenres            • popularity            • recomm...
COUNTRY & CONTINENT       • why           is it useful?            • subgenres            • popularity            • recomm...
IN THE BACKGROUND...                                                             google maps                              ...
YAHOO! PIPESSaturday 26 February 2011
LAST.FMSaturday 26 February 2011
LAST.FMSaturday 26 February 2011
LAST.FM APISaturday 26 February 2011
FREEBASE                      http://www.freebase.com/view/m/01mdm7pSaturday 26 February 2011
FREEBASE                      http://www.freebase.com/view/m/01mdm7pSaturday 26 February 2011
FREEBASE MQL                            {                                "type" : "/music/album",                         ...
FREEBASE MQL           {                "type" : "/music/album",                "name" : "Synchronicity",                "...
BIOGRAPHIES   • from   Last.fm (most of them are       coming from Wikipedia)   • using           demonyms.        • “Ande...
computerSaturday 26 February 2011
The Beatles                                          computerSaturday 26 February 2011
The Beatles        Michael Jackson                                          computerSaturday 26 February 2011
ABBA                            The Beatles        Michael Jackson                                                 compute...
ABBA                            The Beatles                                      1        Michael Jackson                 ...
ABBA                                The Beatles                                          1        Michael Jackson         ...
ABBA                                The Beatles                                                     3                     ...
RESULTS     • with          country we also know continent     • Last.fm and            Freebase only contains data for sm...
THANK YOU!                            QUESTIONS?          slides will appear on http://www.slideshare.net/stengovaertsSatu...
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Multimedia: Music

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The slides of the multimedia course I thought at Al Qudz University for Jad Najjar.

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Multimedia: Music

  1. 1. MULTIMEDIA COURSE: MUSIC Sten GovaertsSaturday 26 February 2011
  2. 2. Saturday 26 February 2011
  3. 3. Saturday 26 February 2011
  4. 4. Saturday 26 February 2011
  5. 5. Saturday 26 February 2011
  6. 6. Katholieke Universiteit LeuvenSaturday 26 February 2011
  7. 7. LeuvenSaturday 26 February 2011
  8. 8. ...NOW LET’S GET TO BUSINESS!Saturday 26 February 2011
  9. 9. Without music life would be a mistake. T Friedrich Wilhelm NietzscheSaturday 26 February 2011
  10. 10. YET ANOTHER PROBLEM? Bartender DJ CustomersSaturday 26 February 2011
  11. 11. YET ANOTHER PROBLEM? Bartender DJ CustomersSaturday 26 February 2011
  12. 12. YET ANOTHER PROBLEM? Bartender DJ CustomersSaturday 26 February 2011
  13. 13. YET ANOTHER PROBLEM? Bartender DJ CustomersSaturday 26 February 2011
  14. 14. YET ANOTHER PROBLEM? Bartender DJ CustomersSaturday 26 February 2011
  15. 15. YET ANOTHER PROBLEM? Bartender DJ CustomersSaturday 26 February 2011
  16. 16. YET ANOTHER PROBLEM? Bartender DJ CustomersSaturday 26 February 2011
  17. 17. YET ANOTHER PROBLEM? Bartender DJ CustomersSaturday 26 February 2011
  18. 18. YET ANOTHER PROBLEM? Bartender DJ CustomersSaturday 26 February 2011
  19. 19. YET ANOTHER PROBLEM? Bartender DJ Customers what we do!Saturday 26 February 2011
  20. 20. YET ANOTHER PROBLEM? Bartender DJ Customers what we do! HAPPY!Saturday 26 February 2011
  21. 21. YET ANOTHER PROBLEM? Bartender DJ Customers business what we do! HAPPY! is goodSaturday 26 February 2011
  22. 22. WHY LIKE THIS?Saturday 26 February 2011
  23. 23. WHY LIKE THIS? • how does an expert select his music?Saturday 26 February 2011
  24. 24. WHY LIKE THIS? • how does an expert select his music? • how does a bartender select his music?Saturday 26 February 2011
  25. 25. WHY LIKE THIS? • how does an expert select his music? • how does a bartender select his music? • making the expert data accessible in a usable way for a bartenderSaturday 26 February 2011
  26. 26. WHY LIKE THIS? • how does an expert select his music? • how does a bartender select his music? • making the expert data accessible in a usable way for a bartender A musical context is a musical description for situations based on atmospheres and musical properties.Saturday 26 February 2011
  27. 27. EXPERTS @ WORK songs param. value matchesSaturday 26 February 2011
  28. 28. EXPERTS @ WORK songs param. value matchesSaturday 26 February 2011
  29. 29. EXPERTS @ WORK songs param. value matchesSaturday 26 February 2011
  30. 30. EXPERTS @ WORK songs param. value matchesSaturday 26 February 2011
  31. 31. EXPERTS @ WORK songs param. value matchesSaturday 26 February 2011
  32. 32. THE SCHEMESaturday 26 February 2011
  33. 33. THE SCHEMESaturday 26 February 2011
  34. 34. THE SCHEMESaturday 26 February 2011
  35. 35. TROUBLE IN EXPERT LANDSaturday 26 February 2011
  36. 36. TROUBLE IN EXPERT LANDSaturday 26 February 2011
  37. 37. TROUBLE IN EXPERT LANDSaturday 26 February 2011
  38. 38. LET’S CREATE A CONTEXT!Saturday 26 February 2011
  39. 39. LET’S CREATE A CONTEXT! subgenre: easy listening, pop café popularity: 5, 6, 7 mood: relax, tasteful, stylishSaturday 26 February 2011
  40. 40. contextSaturday 26 February 2011
  41. 41. context subcontext ASaturday 26 February 2011
  42. 42. context subcontext A songs with subgenre(easy listening OR pop café)Saturday 26 February 2011
  43. 43. context subcontext A songs with subgenre(easy listening OR pop café) + songs with mood(relax OR tasteful OR stylish)Saturday 26 February 2011
  44. 44. context subcontext A songs with subgenre(easy listening OR pop café) + songs with mood(relax OR tasteful OR stylish) + songs with popularity(5 UNTIL 7)Saturday 26 February 2011
  45. 45. context subcontext A subcontext B songs with subgenre(easy listening OR pop café) + songs with mood(relax OR tasteful OR stylish) + + songs with popularity(5 UNTIL 7)Saturday 26 February 2011
  46. 46. context subcontext A subcontext B songs with songs with subgenre(easy listening genre(pop) OR pop café) + songs with mood(relax OR tasteful OR stylish) + + songs with popularity(5 UNTIL 7)Saturday 26 February 2011
  47. 47. context subcontext A subcontext B songs with songs with subgenre(easy listening genre(pop) OR pop café) + + songs with songs with mood(intimate OR mood(relax OR tasteful OR stylish) + romantic OR sensual) + songs with popularity(5 UNTIL 7)Saturday 26 February 2011
  48. 48. context subcontext A subcontext B songs with songs with subgenre(easy listening genre(pop) OR pop café) + + songs with songs with mood(intimate OR mood(relax OR tasteful OR stylish) + romantic OR sensual) + + songs with songs with popularity(5 UNTIL 7) popularity(6 UNTIL 7)Saturday 26 February 2011
  49. 49. context subcontext A subcontext B songs with songs with subgenre(easy listening genre(pop) OR pop café) + 75% 25% + songs with songs with mood(intimate OR mood(relax OR tasteful OR stylish) + romantic OR sensual) + + songs with songs with popularity(5 UNTIL 7) popularity(6 UNTIL 7)Saturday 26 February 2011
  50. 50. WHAT’S UNDER THE HOOD?Saturday 26 February 2011
  51. 51. WHAT’S UNDER THE HOOD?Saturday 26 February 2011
  52. 52. WHAT’S UNDER THE HOOD?Saturday 26 February 2011
  53. 53. WHAT’S UNDER THE HOOD?Saturday 26 February 2011
  54. 54. WHAT’S UNDER THE HOOD?Saturday 26 February 2011
  55. 55. HTTP://WWW.TUNIFY.COMSaturday 26 February 2011
  56. 56. HTTP://WWW.TUNIFY.COMSaturday 26 February 2011
  57. 57. HTTP://WWW.TUNIFY.COMSaturday 26 February 2011
  58. 58. WHAT’S NEXT?... • manually annotated metadata •5 music experts at Aristo Music and different consultants • about 200,000 songs • but, not enough...Saturday 26 February 2011
  59. 59. THE LONG TAIL http://en.wikipedia.org/wiki/Long_TailSaturday 26 February 2011
  60. 60. THE LONG TAIL http://en.wikipedia.org/wiki/Long_TailSaturday 26 February 2011
  61. 61. THE LONG TAIL http://en.wikipedia.org/wiki/Long_TailSaturday 26 February 2011
  62. 62. OTHER PROBLEMS... • satisfyingthe music choice of all customers • retail and catering differ from you and me! • new markets • react fast on emerging music trends • adding the full Belgian library catalogSaturday 26 February 2011
  63. 63. GENERATE THE METADATA • from different sources: • the audio signal • web sources • the Aristo database • attention metadata • using our metadata generation framework: SamgISaturday 26 February 2011
  64. 64. Saturday 26 February 2011
  65. 65. TWO TECHNIQUES • Genre • Country of OriginSaturday 26 February 2011
  66. 66. GENRE... http://techno.org/electronic-music-guide/ • our master thesis looked at different ways to generate genre...Saturday 26 February 2011
  67. 67. GENRESaturday 26 February 2011
  68. 68. GENRESaturday 26 February 2011
  69. 69. GENRESaturday 26 February 2011
  70. 70. GENRESaturday 26 February 2011
  71. 71. CLASSIFICATION WITH SEARCH ENGINES using co-occurrenceSaturday 26 February 2011
  72. 72. CLASSIFICATION WITH SEARCH ENGINES using co-occurrenceSaturday 26 February 2011
  73. 73. CLASSIFICATION WITH SEARCH ENGINES using co-occurrence Artist + Genre + SchemaSaturday 26 February 2011
  74. 74. CLASSIFICATION WITH SEARCH ENGINES using co-occurrence Artist + Genre + SchemaSaturday 26 February 2011
  75. 75. CLASSIFICATION WITH SEARCH ENGINES using co-occurrence Artist + Genre + SchemaSaturday 26 February 2011
  76. 76. CLASSIFICATION WITH SEARCH ENGINES using co-occurrence Artist + Genre + SchemaSaturday 26 February 2011
  77. 77. Saturday 26 February 2011
  78. 78. Rock: Jazz: Blues: Pop: Country: Metal:Saturday 26 February 2011
  79. 79. Rock: Jazz: 0,013 0,013 Blues: Pop: 0,009 0,015 Country: Metal: 0,009 0,005Saturday 26 February 2011
  80. 80. HOW TO EVALUATE THIS? • run an experiment • evaluate on 1995 artists and 9 genres. • different search engines: Google,Yahoo! and Live! Search. • over time: 8 times over a period of 36 days.Saturday 26 February 2011
  81. 81. THE DATA SET Blues Country Electronic Folk Jazz Metal Rap Reggae RnBSaturday 26 February 2011
  82. 82. THE DATA SET Blues Country Electronic Folk Jazz Metal Rap Reggae RnB 10% 9% 3% 2% 12% 13% 5% 4% 41%Saturday 26 February 2011
  83. 83. THE DATA SET Blues Country Electronic Folk Jazz Metal Rap Reggae RnBSaturday 26 February 2011
  84. 84. Saturday 26 February 2011
  85. 85. MOTION CHART • http://hmdb.cs.kuleuven.be/muzik/gapminder.htmlSaturday 26 February 2011
  86. 86. Saturday 26 February 2011
  87. 87. Saturday 26 February 2011
  88. 88. MORE FINE-GRAINED... • 18 artists • more search engines: Google.co.uk/.fr/.be, uk/ fr.search.yahoo.com • twice a day for 53 days • 250,000 queries!Saturday 26 February 2011
  89. 89. 2 Pac Rap Alan Lomax Folk Art Pepper Jazz Cradle of Filth Metal David Parsons Electronic Desmond Dekker Reggae Downpour Metal IceT Rap Jerry Butler RnB Joy Lynn White Country Louisiana Red Blues Lou Rawls RnB LTJ Bukem Electronic Peter Tosh Reggae Pinetop Smith Jazz Robert Johnson Blues Roy Rogers Country Steeleye Span FolkSaturday 26 February 2011
  90. 90. Saturday 26 February 2011
  91. 91. MAIN SEARCH ENGINE RESULTSSaturday 26 February 2011
  92. 92. REGIONAL GOOGLESSaturday 26 February 2011
  93. 93. Saturday 26 February 2011
  94. 94. WHAT TO USE? • use Google when it’s stable else rely on Yahoo! • when is it stable? test with a small set • some artists get classified incorrectly on bad days • compare the accuracy achieved with the test set to the average.Saturday 26 February 2011
  95. 95. DEMO METADATA GENERATION • http://ariadne.cs.kuleuven.be/samgi-service/Saturday 26 February 2011
  96. 96. COUNTRY OF ORIGINSaturday 26 February 2011
  97. 97. MASHUPSSaturday 26 February 2011
  98. 98. MASHUPS • mashups in music: re-mixing multiple existing songs to create a new one.Saturday 26 February 2011
  99. 99. MASHUPS • mashups in music: re-mixing multiple existing songs to create a new one. •a mashup is an application that combines data from multiple online sources to create a new result which was not the original intend of the data.Saturday 26 February 2011
  100. 100. MASHUPS • mashups in music: re-mixing multiple existing songs to create a new one. •a mashup is an application that combines data from multiple online sources to create a new result which was not the original intend of the data. • data is key! • tweaking and enriching data is important • interesting data makes an interesting mashupSaturday 26 February 2011
  101. 101. MY MUSIC MASHUP. • http://www.cs.kuleuven.be/~sten/lastonamfm/Saturday 26 February 2011
  102. 102. COUNTRY & CONTINENT • why is it useful? • subgenres • popularity • recommendations • expensive to annotate • very few existing research • very hard with signal processingSaturday 26 February 2011
  103. 103. COUNTRY & CONTINENT • why is it useful? • subgenres • popularity • recommendations • expensive to annotate • very few existing research • very hard with signal processingSaturday 26 February 2011
  104. 104. COUNTRY & CONTINENT • why is it useful? • subgenres • popularity • recommendations • expensive to annotate • very few existing research ! • very hard with signal processingSaturday 26 February 2011
  105. 105. IN THE BACKGROUND... google maps freebase last.fm google app engine twitter last.fm last.fm yahoo! pipes last on am/fm website dapper youtubeSaturday 26 February 2011
  106. 106. YAHOO! PIPESSaturday 26 February 2011
  107. 107. LAST.FMSaturday 26 February 2011
  108. 108. LAST.FMSaturday 26 February 2011
  109. 109. LAST.FM APISaturday 26 February 2011
  110. 110. FREEBASE http://www.freebase.com/view/m/01mdm7pSaturday 26 February 2011
  111. 111. FREEBASE http://www.freebase.com/view/m/01mdm7pSaturday 26 February 2011
  112. 112. FREEBASE MQL { "type" : "/music/album", "name" : "Synchronicity", "artist" : "The Police", "track" : [{ "name":null, "length":null }] }Saturday 26 February 2011
  113. 113. FREEBASE MQL { "type" : "/music/album", "name" : "Synchronicity", "artist" : "The Police", "track" : [ {"name":"Synchronicity II", "length":305.066}, {"name":"Every Breath You Take", "length":254.066}, {"name":"King of Pain", "length":299.066}, {"name":"Wrapped Around Your Finger", "length":313.733}, {"name":"Tea in the Sahara", "length":255.44}, {"name":"Walking in Your Footsteps", "length":216.773}, {"name":"Miss Gradenko", "length":120}, {"name":"Murder by Numbers", "length":276.8}, {"name":"O My God", "length":242.226}, {"name":"Synchronicity I", "length":202.866}, {"name":"Mother", "length":185.64} ] }Saturday 26 February 2011
  114. 114. BIOGRAPHIES • from Last.fm (most of them are coming from Wikipedia) • using demonyms. • “Anders Trentemøller is a Danish electronic musician.” • List of demonyms from Wikipedia http://en.wikipedia.org/wiki/ List_of_adjectival_and_demonymic_forms_of_place_namesSaturday 26 February 2011
  115. 115. computerSaturday 26 February 2011
  116. 116. The Beatles computerSaturday 26 February 2011
  117. 117. The Beatles Michael Jackson computerSaturday 26 February 2011
  118. 118. ABBA The Beatles Michael Jackson computerSaturday 26 February 2011
  119. 119. ABBA The Beatles 1 Michael Jackson computerSaturday 26 February 2011
  120. 120. ABBA The Beatles 1 Michael Jackson 2 computerSaturday 26 February 2011
  121. 121. ABBA The Beatles 3 1 Michael Jackson 2 computerSaturday 26 February 2011
  122. 122. RESULTS • with country we also know continent • Last.fm and Freebase only contains data for small part • accuracy: • Last.fm: 91% • Freebase: 90% • Bio: 66% • Combination: 77% • more advanced possibilitiesSaturday 26 February 2011
  123. 123. THANK YOU! QUESTIONS? slides will appear on http://www.slideshare.net/stengovaertsSaturday 26 February 2011
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