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On the Spatial Structure of Mixture-of-Experts in Transformers

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arxiv 2504.04444 v1 pith:2I5ZCPBB submitted 2025-04-06 cs.CL cs.AIcs.LG

classification cs.CLcs.AIcs.LG
keywords analysisarchitecturesassumptionbehaviorchallengescommoncrucialdecisions
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A common assumption is that MoE routers primarily leverage semantic features for expert selection. However, our study challenges this notion by demonstrating that positional token information also plays a crucial role in routing decisions. Through extensive empirical analysis, we provide evidence supporting this hypothesis, develop a phenomenological explanation of the observed behavior, and discuss practical implications for MoE-based architectures.

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Cited by 2 Pith papers

Reviewed papers in the Pith corpus that reference this work. Sorted by Pith novelty score. Full citation record

  1. Multi-level context Modeling for consistent expert selection in Mixture-of-Experts

    cs.CL 2026-07 conditional novelty 6.0 of 10

    MCF-MOE improves MoE routing by combining cross-layer attention and local top-k token similarity, reporting lower perplexity and higher downstream accuracy than several MoE baselines.

  2. Diagnosing Overhead in Dispatch Operations: Cross-architecture Observatory

    cs.DC 2026-05 unverdicted novelty 6.0 of 10

    Expert-parallel scaling leaves per-expert routing imbalance flat; mock-token benchmarks overestimate real-text imbalance and fake a batch-size trend; architectures split into data-resilient (MHA, Mamba-2) and persiste...

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