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Recommender
System
How to build a
Võ Duy Tuấn
Technical Director @ dienmay.com
 PHP 5 Zend Certified Engineer
 Mobile App Developer
 Web Developer & Desi...
Introduction
Collaborative Filtering
Question & Answer
AGENDA
1. Introduction
APPLICATIONS
• Personalized recommendation
• Social recommendation
• Item recommendation
• Combination of 3 approaches abo...
AMAZON.COM | BOOKS
PLAY.GOOGLE.COM | APPS
SKILLSHARE.COM | CLASSES
PROCESS DIAGRAM
Preprocessing Data Analysis Adjustment
INPUT OUTPUT
TYPE OF RECOMMENDER SYSTEM
• Collaborative filtering
• Content-based filtering
• Hybrid
2. Collaborative
Filtering
USER & ITEM
ORDER DATA
ORDER DATA (cont.)
ORDER DATA (cont.)
VECTOR & DIMENSION
VECTOR & DIMENSION
VECTORS
VECTORS
SIMILARITY CALCULATION
USER SIMILARITY MATRIX
SIMILARITY CALCULATION
SIMILARITY CALCULATION
SIMILARITY CALCULATION EXAMPLE
K-NEAREST-NEIGHBOR
K-NEAREST-NEIGHBOR
NEIGHBORS’ ORDER
REMOVE BOUGHT ITEMS
CALCULATING FINAL SCORE
OTHER SIMILARITY MEASURES
More at: http://favi.com.vn/wp-content/uploads/2012/05/pg049_Similarity_Measures_for_Text_Docume...
Problem ?!
COLLABORATIVE FILTERING PROBLEM
• Fail with cold start problem
o New User
o New Item
• Performance
o Large Data set
o Pre-...
PERFORMANCE EXAMPLE
• We have 1,000,000 users (customers)
• We sell 10,000 items
- Total of similarity calculating = 1,000...
ITEM-TO-ITEM COLLABORATIVE FILTERING
(AMAZON.COM )
Download Paper: http://www.cs.umd.edu/~samir/498/Amazon-Recommendations...
ADJUSTMENTS
• Hybrid Recommender System
• Sale forecast system
• Context of User
• Type of Item, Action
• External (3rd-pa...
BOOKS
Programming Collective
Intelligence
Toby Segaran
Recommender Systems
Handbook
Many Authors
Big Data For Dummies
Marc...
OPEN SOURCES
Thank you!
CONTACT ME:
tuanmaster2002@yahoo.com
0938 916 902
http://bloghoctap.com/
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How to build a Recommender System

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This presentation show the method to build a Recommender System with Collaborative FIltering method.

How to build a Recommender System

  1. 1. Recommender System How to build a
  2. 2. Võ Duy Tuấn Technical Director @ dienmay.com  PHP 5 Zend Certified Engineer  Mobile App Developer  Web Developer & Designer  Interest: o PHP o Large System & Data Mining o Web Performance Optimization o Mobile Development
  3. 3. Introduction Collaborative Filtering Question & Answer AGENDA
  4. 4. 1. Introduction
  5. 5. APPLICATIONS • Personalized recommendation • Social recommendation • Item recommendation • Combination of 3 approaches above
  6. 6. AMAZON.COM | BOOKS
  7. 7. PLAY.GOOGLE.COM | APPS
  8. 8. SKILLSHARE.COM | CLASSES
  9. 9. PROCESS DIAGRAM Preprocessing Data Analysis Adjustment INPUT OUTPUT
  10. 10. TYPE OF RECOMMENDER SYSTEM • Collaborative filtering • Content-based filtering • Hybrid
  11. 11. 2. Collaborative Filtering
  12. 12. USER & ITEM
  13. 13. ORDER DATA
  14. 14. ORDER DATA (cont.)
  15. 15. ORDER DATA (cont.)
  16. 16. VECTOR & DIMENSION
  17. 17. VECTOR & DIMENSION
  18. 18. VECTORS
  19. 19. VECTORS
  20. 20. SIMILARITY CALCULATION
  21. 21. USER SIMILARITY MATRIX
  22. 22. SIMILARITY CALCULATION
  23. 23. SIMILARITY CALCULATION
  24. 24. SIMILARITY CALCULATION EXAMPLE
  25. 25. K-NEAREST-NEIGHBOR
  26. 26. K-NEAREST-NEIGHBOR
  27. 27. NEIGHBORS’ ORDER
  28. 28. REMOVE BOUGHT ITEMS
  29. 29. CALCULATING FINAL SCORE
  30. 30. OTHER SIMILARITY MEASURES More at: http://favi.com.vn/wp-content/uploads/2012/05/pg049_Similarity_Measures_for_Text_Document_Clustering.pdf
  31. 31. Problem ?!
  32. 32. COLLABORATIVE FILTERING PROBLEM • Fail with cold start problem o New User o New Item • Performance o Large Data set o Pre-calculate
  33. 33. PERFORMANCE EXAMPLE • We have 1,000,000 users (customers) • We sell 10,000 items - Total of similarity calculating = 1,000,000 x 1,000,000 = 1,000,000,000,000 - Each similarity calculate need 0.006s (on my MacBook Pro 2.2GHz Core i7, 8G Ram) => We need 1,000,000,000,000 x 0.006 = 6,000,000,000(s) ≈ 70,000 days ≈ 191 years - If store each similarity in 8 bytes, we need = 8,000,000,000,000 bytes ≈ 8,000 GB (on Memory or File)
  34. 34. ITEM-TO-ITEM COLLABORATIVE FILTERING (AMAZON.COM ) Download Paper: http://www.cs.umd.edu/~samir/498/Amazon-Recommendations.pdf
  35. 35. ADJUSTMENTS • Hybrid Recommender System • Sale forecast system • Context of User • Type of Item, Action • External (3rd-party) information.
  36. 36. BOOKS Programming Collective Intelligence Toby Segaran Recommender Systems Handbook Many Authors Big Data For Dummies Marcia Kaufman, Fern Halper
  37. 37. OPEN SOURCES
  38. 38. Thank you! CONTACT ME: tuanmaster2002@yahoo.com 0938 916 902 http://bloghoctap.com/
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This presentation show the method to build a Recommender System with Collaborative FIltering method.

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