1. A divided and prioritized experience replay approach for streaming regression
- Author
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Mikkel Leite Arnø, John-Morten Godhavn, and Ole Morten Aamo
- Subjects
Streaming regression ,Catastrophic forgetting ,Nonstationarity ,Science - Abstract
In the streaming learning setting, an agent is presented with a data stream on which to learn from in an online fashion. A common problem is catastrophic forgetting of old knowledge due to updates to the model. Mitigating catastrophic forgetting has received a lot of attention, and a variety of methods exist to solve this problem. In this paper, we present a divided and prioritized experience replay approach for streaming regression, in which relevant observations are retained in the replay, and extra focus is added to poorly estimated observations through prioritization. Using a real-world dataset, the method is compared to the standard sliding window approach. A statistical power analysis is performed, showing how our approach improves performance on rare, important events at a trade-off in performance for more common observations. Close inspections of the dataset are provided, with emphasis on areas where the standard approach fails. A rephrasing of the problem to a binary classification problem is performed to separate common and rare, important events. These results provide an added perspective regarding the improvement made on rare events. • We divide the prediction space in a streaming regression setting • Observations in the experience replay are prioritized for further training by the model’s current error
- Published
- 2021
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