MixANT: Observation-dependent Memory Propagation for Stochastic Dense Action Anticipation

Syed Talal Wasim; Hamid Suleman; Olga Zatsarynna; Muzammal Naseer; Juergen Gall

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arXiv · 2509.11394

MixANT: Observation-dependent Memory Propagation for Stochastic Dense Action Anticipation

Syed Talal Wasim·Hamid Suleman·Olga Zatsarynna·Muzammal Naseer·Juergen Gall

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Abstract

We present MixANT, a novel architecture for stochastic long-term dense anticipation of human activities. While recent State Space Models (SSMs) like Mamba have shown promise through input-dependent selectivity on three key parameters, the critical forget-gate ($\textbf{A}$ matrix) controlling temporal memory remains static. We address this limitation by introducing a mixture of experts approach that dynamically selects contextually relevant $\textbf{A}$ matrices based on input features, enhancing representational capacity without sacrificing computational efficiency. Extensive experiments on the 50Salads, Breakfast, and Assembly101 datasets demonstrate that MixANT consistently outperforms state-of-the-art methods across all evaluation settings. Our results highlight the importance of input-dependent forget-gate mechanisms for reliable prediction of human behavior in diverse real-world scenarios.

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Syed Talal Wasim, Hamid Suleman, Olga Zatsarynna, Muzammal Naseer, Juergen Gall. 2025-09-14. MixANT: Observation-dependent Memory Propagation for Stochastic Dense Action Anticipation. https://arxiv.org/abs/2509.11394

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