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TextReg: Mitigating Prompt Distributional Overfitting via Regularized Text-Space Optimization

Researchers introduced TextReg, a method that regularizes text-space prompt optimization to mitigate prompt distributional overfitting in large language models. The work addresses a failure mode in LLM-feedback prompt rewriting, where iteratively optimized prompts grow longer and accumulate narrow sample-specific content.

read1 min views1 publishedOct 6, 2026

Large language models (LLMs) are highly sensitive to the prompts used to specify task objectives and behavioral constraints. Many recent prompt optimization methods iteratively rewrite prompts using LLM-generated feedback, but the resulting prompts often become longer, accumulate narrow sample-speci

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