Online recommendations at scale using matrix factorisation

•

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This presentation was used for my thesis defense held at Universidad Politecnica de Catalunya, Spain, for a double-degree master programme in Distributed Computing. The other two universities participating in the programme are Royal Institute of Technology, Stockholm, Sweden and Instituto Tecnico Superior, Lisbon, Portugal.

Tecnología Empresariales

Thesis presentation:

Online recommendations
at scale with matrix factorisation.

Royal Institute of Technology, Stockholm, Sweden 22 June 2012
Instituto Superior Técnico, Lisbon, Portugal Marcus Ljungblad
Universitat Politécnica de Catalunya, Barcelona, Spain marcus@ljungblad.nu

" 75% of the 30 million daily movie
starts are sourced from
recommendations.

How do you serve
recommendations
from millions of
items to millions
of users online?

Video ratings

2 4 4 ? 1
3 5 ? ? 1
Users

? 4 2 1 ?
1 ? 1 3 3

Video ratings

2.05 3.97 3.96 2.12 1.01
2.93 5.02 3.21 1.61 0.98
Users

2.15 3.95 2.01 1.05 1.10
1.00 4.29 1.01 2.96 2.98

Video ratings

2.05 3.97 3.96 2.12 1.01 2 4 4 ? 1
Users

2.93 5.02 3.21 1.61 0.98 3 5 ? ? 1
2.15 3.95 2.01 1.05 1.10 ? 4 2 1 ?
1.00 4.29 1.01 2.96 2.98 1 ? 1 3 3

2.05 3.97 3.96 2.12 1.01
2.93 5.02 3.21 1.61 0.98
2.15 3.95 2.01 1.05 1.10
1.00 4.29 1.01 2.96 2.98

Interface Delegate Router Worker

request
start

route

compute

top-N

merge
to json
reply

Setup:
• 1-3 machines

• 1 million items

• same rack = high-speed

• 1 test machine

Summary:
... clustering depends on data ...

... need balanced clusters ...

... memory bound ...

... scales ok ...

Photos and pictures borrowed from the Internetz:

Iron Maiden cover: http://en.wikipedia.org/wiki/File:Iron_Maiden_(album)_cover.jpg
Cat picture: http://www.lastfm.es/group/Cats
Coins: http://www.sxc.hu/photo/1235540
iPhones: http://blog.bayuamus.com/2011/08/user-experience-comparison-between-htc-salsa-and-samsung-galaxy-mini/
Amazon recommendations: http://mashable.com/2010/08/06/online-retail-facebook-data/
TV remote: http://www.flickr.com/photos/62337512@N00/2749561795/sizes/z/in/photostream/
Headphones: http://www.flickr.com/photos/markusschoepke/82957375/sizes/m/in/photostream/
Function: http://en.wikipedia.org/wiki/File:Graph_of_example_function.svg
Home servers: http://www.flickr.com/photos/fabrico/477844434/sizes/z/in/photostream/

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Online recommendations at scale using matrix factorisation

1. Thesis presentation: Online recommendations at scale with matrix factorisation. Royal Institute of Technology, Stockholm, Sweden 22 June 2012 Instituto Superior Técnico, Lisbon, Portugal Marcus Ljungblad Universitat Politécnica de Catalunya, Barcelona, Spain marcus@ljungblad.nu

5. " 75% of the 30 million daily movie starts are sourced from recommendations.

6. " a key differentiating factor

7. 3 challenges

10.

11.

12.

13.

14. How do you serve recommendations from millions of items to millions of users online?

15. Video ratings 2 4 4 ? 1 3 5 ? ? 1 Users ? 4 2 1 ? 1 ? 1 3 3

16. f( )

17. Video ratings 2.05 3.97 3.96 2.12 1.01 2.93 5.02 3.21 1.61 0.98 Users 2.15 3.95 2.01 1.05 1.10 1.00 4.29 1.01 2.96 2.98

18. Video ratings 2.05 3.97 3.96 2.12 1.01 2 4 4 ? 1 Users 2.93 5.02 3.21 1.61 0.98 3 5 ? ? 1 2.15 3.95 2.01 1.05 1.10 ? 4 2 1 ? 1.00 4.29 1.01 2.96 2.98 1 ? 1 3 3

19. 2.05 3.97 3.96 2.12 1.01 2.93 5.02 3.21 1.61 0.98 2.15 3.95 2.01 1.05 1.10 1.00 4.29 1.01 2.96 2.98

20. 13x40 MILLION RATINGS

21.

22.

23.

24.

25.

26.

27.

28.

29. Interface Delegate Router Worker request start route compute top-N merge to json reply

30. Interface Delegate Router Worker request start route compute top-N merge to json reply

31. Did it work?

32. Setup: • 1-3 machines • 1 million items • same rack = high-speed • 1 test machine

33. Performance!

34. Performance! h uh?!

35. Did it work? w ell

36. 74% = 74% Offline Online

37.

38. Summary: ... clustering depends on data ... ... need balanced clusters ... ... memory bound ... ... scales ok ...

39. Thank you!

40.

41. Photos and pictures borrowed from the Internetz: Iron Maiden cover: http://en.wikipedia.org/wiki/File:Iron_Maiden_(album)_cover.jpg Cat picture: http://www.lastfm.es/group/Cats Coins: http://www.sxc.hu/photo/1235540 iPhones: http://blog.bayuamus.com/2011/08/user-experience-comparison-between-htc-salsa-and-samsung-galaxy-mini/ Amazon recommendations: http://mashable.com/2010/08/06/online-retail-facebook-data/ TV remote: http://www.flickr.com/photos/62337512@N00/2749561795/sizes/z/in/photostream/ Headphones: http://www.flickr.com/photos/markusschoepke/82957375/sizes/m/in/photostream/ Function: http://en.wikipedia.org/wiki/File:Graph_of_example_function.svg Home servers: http://www.flickr.com/photos/fabrico/477844434/sizes/z/in/photostream/

42. Extra material...

43.

44.

45. AXYDBLSZQ (1/2) / 1 AXYDBLSZQ (1/1) / 1 AXYDBLSZQ (1/1 + 2/3) / 2

Online recommendations at scale using matrix factorisation

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