Continual learning for robotics: Definition, framework, learning strategies, opportunities and challenges

•State of the art on continual / lifelong learning and its implications for robotics.•Proposal of a framework to present Continual Learning algorithms.•Summary of existing metrics for continual learning.•Presenting robotics applications for continual learning, current challenges and opportunities. C...

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Veröffentlicht in:Information fusion Jg. 58; S. 52 - 68
Hauptverfasser: Lesort, Timothée, Lomonaco, Vincenzo, Stoian, Andrei, Maltoni, Davide, Filliat, David, Díaz-Rodríguez, Natalia
Format: Journal Article
Sprache:Englisch
Veröffentlicht: Elsevier B.V 01.06.2020
Elsevier
Schlagworte:
Artificial Intelligence
Catastrophic Forgetting
Computational Engineering, Finance, and Science
Computer Science
Computer Vision and Pattern Recognition
Continual Learning
Deep Learning
Lifelong Learning
Reinforcement Learning
Robotics
Reinforcement Learning
Continual Learning
Catastrophic Forgetting
Lifelong Learning
Robotics
Deep Learning
ContinualLearning
ISSN:1566-2535, 1872-6305
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Zusammenfassung:•State of the art on continual / lifelong learning and its implications for robotics.•Proposal of a framework to present Continual Learning algorithms.•Summary of existing metrics for continual learning.•Presenting robotics applications for continual learning, current challenges and opportunities. Continual learning (CL) is a particular machine learning paradigm where the data distribution and learning objective change through time, or where all the training data and objective criteria are never available at once. The evolution of the learning process is modeled by a sequence of learning experiences where the goal is to be able to learn new skills all along the sequence without forgetting what has been previously learned. CL can be seen as an online learning where knowledge fusion needs to take place in order to learn from streams of data presented sequentially in time. Continual learning also aims at the same time at optimizing the memory, the computation power and the speed during the learning process. An important challenge for machine learning is not necessarily finding solutions that work in the real world but rather finding stable algorithms that can learn in real world. Hence, the ideal approach would be tackling the real world in a embodied platform: an autonomous agent. Continual learning would then be effective in an autonomous agent or robot, which would learn autonomously through time about the external world, and incrementally develop a set of complex skills and knowledge.Robotic agents have to learn to adapt and interact with their environment using a continuous stream of observations. Some recent approaches aim at tackling continual learning for robotics, but most recent papers on continual learning only experiment approaches in simulation or with static datasets. Unfortunately, the evaluation of those algorithms does not provide insights on whether their solutions may help continual learning in the context of robotics. This paper aims at reviewing the existing state of the art of continual learning, summarizing existing benchmarks and metrics, and proposing a framework for presenting and evaluating both robotics and non robotics approaches in a way that makes transfer between both fields easier. We put light on continual learning in the context of robotics to create connections between fields and normalize approaches.
ISSN:1566-2535
1872-6305
DOI:10.1016/j.inffus.2019.12.004