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Cooperation is a widespread phenomenon in nature that has also been a cornerstone in the development of human intelligence. Understanding cooperation, therefore, on matters such as how it emerges, develops, or fails is an important avenue of research, not only in a human context, but also for the advancement of next generation artificial intelligence paradigms which are presumably human-compatible. With this motivation in mind, we study the emergence of cooperative behaviour between two independent deep reinforcement learning (RL) agents provided with human input in a novel game environment. In particular, we investigate whether evaluative human feedback (through interactive RL) and expert demonstration (through inverse RL) can help RL agents to learn to cooperate better. We report two main findings. Firstly, we find that the amount of feedback given has a positive impact on the accumulated reward obtained through cooperation. That is, agents trained with a limited amount of feedback outperform agents trained without any feedback, and the performance increases even further as more feedback is provided. Secondly, we find that expert demonstration also helps agents’ performance, although with more modest improvements compared to evaluative feedback. In conclusion, we present a novel game environment to better understand the emergence of cooperative behaviour and show that providing human feedback and demonstrations can accelerate this process.
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