Learning-to-Rank

CP4285 Modern Recommendation Systems — Week 08 QR code for the Week 08 slide deckScan for the slides
soc-n.us/cp4285-t2610-w08

CP4285 Instruction Team

06 Oct 2026

01 Overview

Week 8: Learning-to-Rank

Learning outcomes

  • Formulate ranking objectives.
  • Compare ranking approaches.
  • Analyze position bias.

  • Discuss fairness implications of ranking.

02 Ranking Objectives

Pointwise, pairwise, and listwise learning

TODO: add LambdaRank intuition and worked examples. ## Ethics Thread: Position bias ::: {.callout-warning} TODO: examine fair ranking under biased feedback. ::: —

Summary

🔑 A ranking objective encodes which errors matter most.

Next week: graph-based recommendation.