Multi-modal Feedback for Affordance-driven Interactive Reinforcement Learning

International Joint Conference on Neural Networks (IJCNN), pages 5115--5122, doi:10.1109/IJCNN.2018.8489237 - Jul 2018.
Associated documents : ijcnn18_CRV-1.pdf [500Ko]   http://dx.doi.org/10.1109/IJCNN.2018.8489237
Interactive reinforcement learning (IRL) extends traditional reinforcement learning (RL) by allowing an agent to interact with parent-like trainers during a task. In this paper, we present an IRL approach using dynamic audio-visual input in terms of vocal commands and hand gestures as feedback. Our architecture integrates multi-modal information to provide robust commands from multiple sensory cues along with a confidence value indicating the trustworthiness of the feedback. The integration process also considers the case in which the two modalities convey incongruent information. Additionally, we modulate the influence of sensory-driven feedback in the IRL task using goal-oriented knowledge in terms of contextual affordances. We implement a neural network architecture to predict the effect of performed actions with different objects to avoid failed-states, i.e., states from which it is not possible to accomplish the task. In our experimental setup, we explore the interplay of multimodal feedback and task-specific affordances in a robot cleaning scenario. We compare the learning performance of the agent under four different conditions: traditional RL, multi-modal IRL, and each of these two setups with the use of contextual affordances. Our experiments show that the best performance is obtained by using audio-visual feedback with affordancemodulated IRL. The obtained results demonstrate the importance of multi-modal sensory processing integrated with goal-oriented knowledge in IRL tasks.

 

@InProceedings{CPW18,
  author       = "Cruz, Francisco and Parisi, German I. and Wermter, Stefan",
  title        = "Multi-modal Feedback for Affordance-driven Interactive Reinforcement Learning",
  booktitle    = "International Joint Conference on Neural Networks (IJCNN)",
  pages        = "5115--5122",
  month        = "Jul",
  year         = "2018",
  doi          = "10.1109/IJCNN.2018.8489237",
  url          = "https://www2.informatik.uni-hamburg.de/wtm/publications/2018/CPW18/ijcnn18_CRV-1.pdf"
}

» Francisco Cruz
» German I. Parisi
» Stefan Wermter