Blog Post··5 min read
ML System Design: Recommendation Systems
Candidate generation, ranking, and reranking — the three-stage funnel behind YouTube and Spotify. Two-tower retrieval, why the funnel exists, and how cold start is actually solved.
Tag: ranking
Blog Post··10 min read
The Bradley–Terry Model: From ELO Scores to Reward Models
Chatbot Arena ranks LLMs with ELO, InstructGPT trains a reward model on pairwise preferences, and chess has rated players for seventy years. All three rest on the same one-line probabilistic model — Bradley–Terry — which turns out to be logistic regression over comparisons.
Blog Post··10 min read
The Bradley–Terry Model: From ELO Scores to Reward Models
Chatbot Arena ranks LLMs with ELO, InstructGPT trains a reward model on pairwise preferences, and chess has rated players for seventy years. All three rest on the same one-line probabilistic model — Bradley–Terry — which turns out to be logistic regression over comparisons.