EventHD: Robust and efficient hyperdimensional learning with neuromorphic sensor
Abstract
Brain-inspired computing models have shown great potential to outperform today's deep learning solutions in terms of robustness and energy efficiency. Particularly, Hyper-Dimensional Computing (HDC) has shown promising results in enabling efficient and robust cognitive learning. In this study, we exploit HDC as an alternative computational model that mimics important brain functionalities toward high-efficiency and noise-tolerant neuromorphic computing. We present EventHD, an end-to-end learning framework based on HDC for robust, efficient learning from neuromorphic sensors. We first introduce a spatial and temporal encoding scheme to map event-based neuromorphic data into high-dimensional space. Then, we leverage HDC mathematics to support learning and cognitive tasks over encoded data, such as information association and memorization. EventHD also provides a notion of confidence for each prediction, thus enabling self-learning from unlabeled data. We evaluate EventHD efficiency over data collected from Dynamic Vision Sensor (DVS) sensors. Our results indicate that EventHD can provide online learning and cognitive support while operating over raw DVS data without using the costly preprocessing step. In terms of efficiency, EventHD provides 14.2× faster and 19.8× higher energy efficiency than state-of-the-art learning algorithms while improving the computational robustness by 5.9×.
Document Details
- Document Type
- Pub Defense Publication
- Publication Date
- Jul 27, 2022
- Source ID
- 10.3389/fnins.2022.858329
Entities
People
- Haleh Alimohamadi
- M. Hassan Najafi
- Mohsen Imani
- Narayan Srinivasa
- Yeseong Kim
- Zhuowen Zou
Organizations
- Air Force Office of Scientific Research
- Cisco
- National Science Foundation
- Office of Naval Research
- Semiconductor Research Corporation