We study the benefit of sharing representations among tasks to enable the effective use of deep neural networks in Multi-Task Reinforcement Learning. We leverage the assumption that learning from different tasks, sharing common properties, is helpful to generalize the knowledge of them resulting in a more effective feature extraction compared to learning a single task. Intuitively, the resulting set of features offers performance benefits when used by Reinforcement Learning algorithms. We prove this by providing theoretical guarantees that highlight the conditions for which is convenient to share representations among tasks, extending the well-known finite-time bounds of Approximate Value-Iteration to the multi-task setting. In addition, we complement our analysis by proposing multi-task extensions of three Reinforcement Learning algorithms that we empirically evaluate on widely used Reinforcement Learning benchmarks showing significant improvements over the single-task counterparts in terms of sample efficiency and performance.

我们研究了在多任务强化学习中共享表示的益处，以实现深度神经网络的有效使用。我们利用从不同任务中学习、分享共同特性的假设，有助于推广知识，从而比学习单个任务更有效地进行特征提取。通过在广泛使用的强化学习基准上进行实证评估，我们提出了三种强化学习算法的多任务扩展，并证明了在样本效率和性能方面相较于单任务具有显著改进。

多任务深度强化学习中的知识共享