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Author Alberto Maria Metelli Abstract Reinforcement Learning (RL) has emerged as an effective approach to address a variety of complex control tasks. In a typical RL problem, an agent interacts with the environment by perceiving observations and performing actions, with the ultimate goal of maximizing the cumulative reward. In the traditional formulation, the environment is […]

Authors Matteo Castiglioni, Andrea Celli, Alberto Marchesi, Nicola Gatti Abstract In Bayesian persuasion, an informed sender has to design a signaling scheme that discloses the right amount of information so as to influence the behavior of a self-interested receiver. This kind of strategic interaction is ubiquitous in realworld economic scenarios. However, the seminal model by […]

Authors Matteo Castiglioni, Alberto Marchesi, Andrea Celli, Nicola Gatti Abstract Bayesian persuasion studies how an informed sender should partially disclose information to influence the behavior of a self-interested receiver. Classical models make the stringent assumption that the sender knows the receiver’s utility. This can be relaxed by considering an online learning framework in which the sender repeatedly faces […]

Authors Gabriele Farina, Andrea Celli, Nicola Gatti, Tuomas Sandholm Abstract We focus on the problem of finding an optimal strategy for a team of players that faces an opponent in an imperfect-information zero-sum extensive-form game. Team members are not allowed to communicate during play but can coordinate before the game. In this setting, it is […]

Authors Matteo Castiglioni, Alberto Marchesi, Nicola Gatti Abstract We study principal-agent problems in which a principal commits to an outcome-dependent payment scheme (a.k.a. contract) so as to induce an agent to take a costly, unobservable action. We relax the assumption that the principal perfectly knows the agent by considering a Bayesian setting where the agent’s […]

Authors Matteo Castiglioni, Diodato Ferraioli, Nicola Gatti, Giulia Landriani Abstract We focus on the election manipulation problem through social influence, where a manipulator exploits a social network to make her most preferred candidate win an election. Influence is due to information in favor of and/or against one or multiple candidates, sent  by seeds and spreading […]

Authors Matteo Castiglioni, Alberto Marchesi, NicolaGatti Abstract We address multi-agent Stackelberg settings involving many leaders and followers. In order to effectively model this kind of interactions, we extend the idea of commitment to correlated strategies to Stackelberg games with multiple leaders and followers. Correlation can be easily implemented by resorting to a device that sends signals to the players, […]

Authors Martino Bernasconi, Federico Cacciamani, Simone Fioravanti, Nicola Gatti, Francesco Trovò Abstract In this paper, we study the mean dynamics of the soft-max policy gradient algorithm in multi-agent settings by resorting to evolutionary game theory and dynamical system tools. Such a study is crucial to understand the algorithm’s weaknesses when employed in multi-agent settings. Unlike […]