David Liu
Assistant Research Professor @ Cornell
algorithmic fairness, social networks, and recommender systems
dliu18.github.io
- 🎙️ I had a great time joining the Data Skeptic podcast to talk about my work on recommender systems If you're interested in embeddings, aligning group preferences, or music recommendations, check out the episode below 👇 open.spotify.com/episode/6IsP...
- In the episode, I discuss: • 📉 How PCA embeddings can misrepresent minority preferences • ⚡ Who power-niche users are and why they matter • 🔬 Open research questions on aligning group preferences in AI models
- 📄 Paper links: • When Collaborative Filtering is not Collaborative: Unfairness of PCA for Recommendations (FAccT ’25) arxiv.org/abs/2310.09687 • Identifying and Upweighting Power-Niche Users to Mitigate Popularity Bias in Recommendations (WWW ’26) arxiv.org/abs/2509.17265
