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Do Syntax Heads Influence Model Behavior?

2026-10-13 21:47:26
William Timkey, Tal Linzen
arXiv_CL
             
Abstract

Transformer language models develop attention heads that specialize in syntactic relations, for example, attending from verbs to their subjects. Do these heads play a causal role in the model's syntactic predictions? Evidence for such a role is mixed to negative: even when we force these heads to attend to a distractor noun other than the subject, the model's syntactic predictions are still more consistent with the subject than with the distractor. Interventions on specialized syntax heads had a significantly stronger effect on syntactic predictions than interventions on random heads, but only in one of the two measures we propose.

Abstract (translated)

URL

https://arxiv.org/abs/2610.19231

PDF

https://arxiv.org/pdf/2610.19231.pdf

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