arXiv AI By Ha Van Dau, Thanh Tung Khuat, Nguyen Thanh Dung

Beyond Depth Truncation: Controlled Evaluation of Depth Utilization in Recursive Language Models

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The paper critiques the common practice of evaluating depth usage in depth‑recurrent language models by truncating depth during inference and measuring performance decline. It argues that this method conflates three distinct effects—fewer block applications, reduced computation, and an out‑of‑distribution readout—yet is usually interpreted as measuring only the second. To address this, the authors introduce the Depth Control Protocol (DCP), a suite of positive and negative controls that isolate each factor, along with a training intervention to confirm causality, specifically tailored for depth‑wise weight‑sharing architectures.

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