Comparison of Input-Data Matrix Representations Used for Continual Learning with Orthogonal Weight Modification on Edge Devices

The number of industrial processes in which smart devices have been employed rises every day; these devices can be found performing tasks related to the automation, digitization, or optimization of the process. Generally, for these tasks, the devices need to communicate with each other and with a central unit monitored by humans, which is where Industrial Internet of Things (IIoT) comes into play, allowing a network to be built between the devices. Communication might be enough for monitoring purposes, but the optimization and automation of the process are yet to be addressed. In this study, we use an object detection sensor as an initial test subject to explore the Artificial Neural Twin (ANT) as a distributed-process optimization tool in combination with Orthogonal Weight Modification (OWM), a continual learning (CL) method used to augment self-operating devices (i.e., microcontrollers used for machine-vision sensors) with the capacity to learn new tasks autonomously. Some of these devices lack the hardware capacity to run a CL algorithm, which also motivated the comparison of the Fisher matrix, NEig-OWM, and LoRA as matrix approximations to reduce the complexity of the operations between them. Among the compared matrices, we found the Fisher matrix to be the least expensive solution with a negligible reduction in the model's performance after CL, which makes it a viable solution for large AI models, while NEig-OWM is better suited for smaller models that require fewer hardware resources but more control over the CL algorithm.