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stat.ML2025

A Generalization Theory for Zero-Shot Prediction

Ronak Mehta, Zaid Harchaoui

A modern paradigm for generalization in machine learning and AI consists of pre-training a task-agnostic foundation model, generally obtained using self-supervised and multimodal c…

stat.ML2025

Stochastic Gradients under Nuisances

Facheng Yu, Ronak Mehta, Alex Luedtke +1

Stochastic gradient optimization is the dominant learning paradigm for a variety of scenarios, from classical supervised learning to modern self-supervised learning. We consider st…

stat.ML2024

The Benefits of Balance: From Information Projections to Variance Reduction

Lang Liu, Ronak Mehta, Soumik Pal +1

Data balancing across multiple modalities and sources appears in various forms in foundation models in machine learning and AI, e.g. in CLIP and DINO. We show that data balancing a…

stat.ML2024

Drago: Primal-Dual Coupled Variance Reduction for Faster Distributionally Robust Optimization

Ronak Mehta, Jelena Diakonikolas, Zaid Harchaoui

We consider the penalized distributionally robust optimization (DRO) problem with a closed, convex uncertainty set, a setting that encompasses learning using -DRO and spectral/$…

stat.ML20231 cited

Distributionally Robust Optimization with Bias and Variance Reduction

Ronak Mehta, Vincent Roulet, Krishna Pillutla +1

We consider the distributionally robust optimization (DRO) problem with spectral risk-based uncertainty set and -divergence penalty. This formulation includes common risk-sensit…