arXiv Machine Learning By Taylan Soydan, Miguel A. Bessa, Dirk Mohr, Rui Barreira

TIDES: Implicit Time-Awareness in Selective State Space Models

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TIDES is a new selective state space model that keeps the learned step size equal to the physical time gap, enabling it to handle irregular timestamps while maintaining per‑token expressivity. By moving input dependence from the step size to the diagonal state matrix, TIDES combines the strengths of selective SSMs like Mamba and continuous‑time SSMs like S5. Experiments on a novel Fading Flash benchmark and large‑scale datasets show that TIDES outperforms or matches state‑of‑the‑art models on irregular time‑series tasks.

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