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Valentin Villecroze

4 accepted papers

2026

Agentic Monte Carlo: Reinforcement Learning for Black-Box LLM Agents

ICML 2026poster

LLM agents operate in two distinct regimes: open-weight agents amenable to reinforcement learning (RL) and black-box agents whose behaviour must be controlled purely at test time. Although black-box agents are often backed by state-of-the-art proprietary LLMs, API-only access precludes parameter-lev…

Cited by 0SourceScholar
2024

Data-Efficient Multimodal Fusion on a Single GPU

CVPR 2024highlight

The goal of multimodal alignment is to learn a single latent space that is shared between multimodal inputs. The most powerful models in this space have been trained using massive datasets of paired inputs and large-scale computational resources making them prohibitively expensive to train in many p…

2023

Exposing flaws of generative model evaluation metrics and their unfair treatment of diffusion models

NeurIPS 2023poster

We systematically study a wide variety of generative models spanning semantically-diverse image datasets to understand and improve the feature extractors and metrics used to evaluate them. Using best practices in psychophysics, we measure human perception of image realism for generated samples by co…

2022

Bayesian Nonparametrics for Offline Skill Discovery

ICML 2022spotlight

Skills or low-level policies in reinforcement learning are temporally extended actions that can speed up learning and enable complex behaviours. Recent work in offline reinforcement learning and imitation learning has proposed several techniques for skill discovery from a set of expert trajectories.…