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Lewis Hammond

7 accepted papers

2025

Evaluating Generalization Capabilities of LLM-Based Agents in Mixed-Motive Scenarios Using Concordia

NeurIPS 2025poster

Large Language Model (LLM) agents have demonstrated impressive capabilities for social interaction and are increasingly being deployed in situations where they might engage with both human and artificial agents. These interactions represent a critical frontier for LLM-based agents, yet existing eval…

Cited by 0SourceScholar
2025

Neural Interactive Proofs

ICLR 2025poster

We consider the problem of how a trusted, but computationally bounded agent (a 'verifier') can learn to interact with one or more powerful but untrusted agents ('provers') in order to solve a given task. More specifically, we study the case in which agents are represented using neural networks and r…

Cited by 1SourcePDFScholar
2024

Melting Pot Contest: Charting the Future of Generalized Cooperative Intelligence

NeurIPS 2024poster

Multi-agent AI research promises a path to develop human-like and human-compatible intelligent technologies that complement the solipsistic view of other approaches, which mostly do not consider interactions between agents. Aiming to make progress in this direction, the Melting Pot contest 2023 focu…

Cited by 0SourcePDFScholar
2024

Reasoning about Causality in Games (Abstract Reprint)

AAAI 2024technical

Causal reasoning and game-theoretic reasoning are fundamental topics in artificial intelligence, among many other disciplines: this paper is concerned with their intersection. Despite their importance, a formal framework that supports both these forms of reasoning has, until now, been lacking. We of…

Cited by 1SourcePDFScholar
2024

Secret Collusion among AI Agents: Multi-Agent Deception via Steganography

NeurIPS 2024poster

Recent advancements in generative AI suggest the potential for large-scale interaction between autonomous agents and humans across platforms such as the internet. While such interactions could foster productive cooperation, the ability of AI agents to circumvent security oversight raises critical mu…

Cited by 6SourcePDFScholar
2022

Lexicographic Multi-Objective Reinforcement Learning

IJCAI 2022poster

In this work we introduce reinforcement learning techniques for solving lexicographic multi-objective problems. These are problems that involve multiple reward signals, and where the goal is to learn a policy that maximises the first reward signal, and subject to this constraint also maximises the…