arXiv Machine Learning By Chaemin Jang, Donggyu Lee, Jeesoo Kim, Dongman Lee, Jihee Kim

Isolating a Language Model's Judgment with a Label-Free Subspace

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The paper investigates how language models’ internal judgments can be separated from the way those judgments are expressed. By comparing hidden-state vectors under different instructions, the authors identify a low-dimensional expression subspace that can be removed to isolate the model’s true judgment. This isolation improves predictive performance across tasks such as correctness, entailment, and safety, even when the model’s final answers degrade.

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