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This research introduces Dynamical Mode Pruning (DMP), a novel technique for optimizing Echo State Networks by evaluating neurons based on their contribution to input-driven state transitions rather than static metrics. By leveraging trajectory-averaged Jacobian Gramians, the method effectively identifies and removes redundant components in reservoir computing models without sacrificing forecasting accuracy on chaotic time-series benchmarks. The study highlights that dynamic influence is a critical criterion for refining over-parameterized neural architectures beyond traditional structural importance measures.
Rethinking Reservoir Pruning: A Dynamical Perspective for Echo State Networks
arXiv:2608.04593v1 Announce Type: new Abstract: Echo State Networks (ESNs) offer an efficient framework for temporal prediction, but their randomly initialized reservoirs are often over-parameterized and dynamically redundant. Existing pruning methods largely rely on static connectivity or activation statistics, which may overlook neurons that shape input-driven state transitions. We propose Dynamical Mode Pruning (DMP), a reservoir pruning method that ranks neurons by their contribution to dominant transition modes obtained from a trajectory-averaged Jacobian Gramian. DMP removes low-impact units and retrains only the readout. Experiments on chaotic and real-world time-series benchmarks show that DMP improves or preserves forecasting accuracy while reducing redundant reservoir components. Our results suggest that dynamical influence is a useful criterion for reservoir refinement beyond static structural importance alone.
Abstract:Echo State Networks (ESNs) offer an efficient framework for temporal prediction, but their randomly initialized reservoirs are often over-parameterized and dynamically redundant. Existing pruning methods largely rely on static connectivity or activation statistics, which may overlook neurons that shape input-driven state transitions. We propose Dynamical Mode Pruning (DMP), a reservoir pruning method that ranks neurons by their contribution to dominant transition modes obtained from a trajectory-averaged Jacobian Gramian. DMP removes low-impact units and retrains only the readout. Experiments on chaotic and real-world time-series benchmarks show that DMP improves or preserves forecasting accuracy while reducing redundant reservoir components. Our results suggest that dynamical influence is a useful criterion for reservoir refinement beyond static structural importance alone.
Machine Learning (cs.LG); Artificial Intelligence (cs.AI); Dynamical Systems (math.DS)
arXiv:2608.04593 [cs.LG]
(or arXiv:2608.04593v1 [cs.LG] for this version)
https://doi.org/10.48550/arXiv.2608.04593 Focus to learn more arXiv-issued DOI via DataCite (pending registration)
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Full text under the publisher's open licence · 215 words
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