A Declarative-Procedural Perspective on Expert Routing in Bilingual Mixture-of-Experts Language Models
We investigate whether Mixture-of-Experts (MoE) language models develop linguistically structured expert routing during bilingual language acquisition. Inspired by the Declarative-Procedural framework, we analyze lexical, grammatical, and syntactic processing in a decoder-only English-German MoE Transformer trained under sequential language exposure. We construct a probe-based validation set and extract token-level routing distributions to quantify category-dependent specialisation using mutual information, routing entropy, and Jensen-Shannon distance. The curriculum-trained model exhibits a peak mutual information of 0.1148 at layer 5, indicating category-dependent differences in routing...
| Authors | Amrit Gopinath, Raghul, Durairaj Thenmozhi |
|---|---|
| Primary category | cs.CL |
| Published | 15 August 2026 |
| Last updated at source | 28 August 2026 |
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