David Liu
Assistant research professor at Cornell University's Center for Data Science for Enterprise and Society focusing on fairness in machine learning and recommender systems, known for work on PCA-based recommendations and concepts like power niche users.
Best podcasts with David Liu
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Jan 26, 2026 • 50min
Fairness in PCA-Based Recommenders
David Liu, assistant research professor at Cornell focused on fairness in ML and recommenders, discusses PCA-based recommenders and why they can ignore niche and minority users. He introduces power niche users and explains how PCA over-specializes while proposing item-weighted PCA and upweighting strategies. The chat covers tradeoffs, evaluation, scalability, and the need for better datasets.
