Joao Costeira

2 accepted papers

2026

Spectral Guidance for Flexible and Efficient Control of Diffusion Models

Gabriel Moreira, Manuel Marques, Joao Costeira, Chenyan Xiong

ICML 2026poster

We introduce Spectral Guidance, a framework for controlling diffusion models by leveraging the intrinsic geometry of the generative process. As data is progressively corrupted by noise, only a small number of features remain informative for control. We characterize them as the singular functions of …

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2025

Learning Visual-Semantic Subspace Representations

Gabriel Moreira, Manuel Marques, Joao Costeira, Alexander G Hauptmann

AISTATS 2025poster

Learning image representations that capture rich semantic relationships remains a significant challenge. Existing approaches are either contrastive, lacking robust theoretical guarantees, or struggle to effectively represent the partial orders inherent to structured visual-semantic data. In this pap…

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