Representation Learning for Event-based Visuomotor PoliciesDownload PDF

Published: 09 Nov 2021, Last Modified: 05 May 2023NeurIPS 2021 SpotlightReaders: Everyone
Keywords: Event cameras, Representation Learning, Reinforcement Learning, Variational Autoencoder
TL;DR: We present methods for representation learning and reinforcement learning directly from asynchronous event camera, and demonstrate advantages over frame-based techniques using an obstacle avoidance task.
Abstract: Event-based cameras are dynamic vision sensors that provide asynchronous measurements of changes in per-pixel brightness at a microsecond level. This makes them significantly faster than conventional frame-based cameras, and an appealing choice for high-speed robot navigation. While an interesting sensor modality, this asynchronously streamed event data poses a challenge for machine learning based computer vision techniques that are more suited for synchronous, frame-based data. In this paper, we present an event variational autoencoder through which compact representations can be learnt directly from asynchronous spatiotemporal event data. Furthermore, we show that such pretrained representations can be used for event-based reinforcement learning instead of end-to-end reward driven perception. We validate this framework of learning event-based visuomotor policies by applying it to an obstacle avoidance scenario in simulation. Compared to techniques that treat event data as images, we show that representations learnt from event streams result in faster policy training, adapt to different control capacities, and demonstrate a higher degree of robustness to environmental changes and sensor noise.
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