AI
Hybrid Search: Combining BM25 and Vector Similarity
Why pure vector search underperforms on keyword-heavy queries, and how to combine it with BM25 using score fusion that actually works.
3 min read
Tag
Search
4 articles
Airbnb
From Heuristics to Learned Ranking: Airbnb Search's Evolution
How Airbnb's search ranking moved from hand-tuned heuristics to gradient-boosted trees and eventually neural networks, and what each transition actually bought.
3 min read
Pinterest
Teaching Pinterest to See What's Inside a Pin
How Pinterest built visual search and object detection to let people discover products and ideas by tapping on specific items inside an image.
3 min read
Twitter
Earlybird: Real-Time Search Over Twitter's Firehose
How Twitter built Earlybird, a Lucene-based inverted index engineered to make freshly posted tweets searchable within seconds of being sent.
3 min read