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The dark art of search relevancy
- 1. The dark art of search relevancy
- 3. We collect the world of fashion into a customisable shopping experience.
- 4. 90 thousand 3,800,000 items scraped per day. items updated / hour
- 5. 5
- 6. Why is search hard? 6
- 7. True NegativesFalse Negatives Selected Elements True Positives False Positives Relevant Elements Precision Recall How many selected items are relevant? How many selected items are relevant?
- 8. BM25 8
- 9. When it goes wrong… “Little Black Dress”
- 10. When it goes wrong… “Red Valentino”
- 11. BCBGMAXZRIA 11
- 13. Dress
- 15. Dress Dress Shirt Shirt Dress
- 16. What is a good result?
- 22. Search Term Example 1.) designer + category “hermes sandal” 2.) designer + colour + category “burberry black boots” 3.) designer + fabric + category “chloe leather top” 4.) color + category “gray hoodie” 5.) designer + type “asos bag” What are people actually searching?
- 23. DSSM
- 24. DSSM with 1D convolution and max pooling C-DSSM
- 25. CSSM Results Search Result Score Download office Excel 0.54 Word office online 0.50 Apartment office hours 0.33 Internation office berklely 0.27 “Microsoft Office” Search Result Score Car body kits 0.70 Auto body parts 0.55 Calculate body fat 0.22 Forcefield body armour 0.17 “Car body shop”
- 26. Computing the results Store hidden layer representation in postgres Rank by cosine distance Speed up search with ANN Random projection trees Calculate query representation at run time Docker, Django-rest, chef, empire, auto-scaling
- 27. Images?
- 28. Images Train 8 layer CNN Swap out soft max layer A soft max layer for each label of interest 60 Million parameters Build robust learned representations Represents products as a 4096 element vector
- 29. Image Classifier Sub-category Score Male, clothing, suits, 3 piece suits 0.72263 Male, clothing, suits, 2 piece suits 0.12102 Male, clothing, jackets, formal jackets 0.10818 Male, clothing, coats, trench coats 0.02396 Male, clothing, jackets, casual jackets 0.00949 Colors Blue 0.99397 Gray 0.00481 Black 0.00071
- 33. Search is fun but search is hard Conclusion 33
- 34. thank you