Hierarchical Architectures in Reservoir Computing Systems

TL;DR

This paper explores how hierarchical, deep reservoir structures in reservoir computing enhance nonlinear data transformation and temporal information capture, leading to improved performance and hardware implementation benefits.

Contribution

It introduces the concept of stacking sub-reservoirs to form deep reservoirs, demonstrating their advantages over larger single reservoirs and analyzing the tradeoffs involved.

Findings

Deep reservoirs improve nonlinear transformation capabilities.

Later-stage sub-reservoirs capture low-frequency components.

Deep structures outperform simple reservoir size increases.

Abstract

Reservoir computing (RC) offers efficient temporal data processing with a low training cost by separating recurrent neural networks into a fixed network with recurrent connections and a trainable linear network. The quality of the fixed network, called reservoir, is the most important factor that determines the performance of the RC system. In this paper, we investigate the influence of the hierarchical reservoir structure on the properties of the reservoir and the performance of the RC system. Analogous to deep neural networks, stacking sub-reservoirs in series is an efficient way to enhance the nonlinearity of data transformation to high-dimensional space and expand the diversity of temporal information captured by the reservoir. These deep reservoir systems offer better performance when compared to simply increasing the size of the reservoir or the number of sub-reservoirs. Low frequency components are mainly captured by the sub-reservoirs in later stage of the deep reservoir structure, similar to observations that more abstract information can be extracted by layers in the late stage of deep neural networks. When the total size of the reservoir is fixed, tradeoff between the number of sub-reservoirs and the size of each sub-reservoir needs to be carefully considered, due to the degraded ability of individual sub-reservoirs at small sizes. Improved performance of the deep reservoir structure alleviates the difficulty of implementing the RC system on hardware systems.