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The Origins of Representation Manifolds in Large Language Models

★ ★ ★ ★ ☆

Resumen del artículo

Título de Paperzilla
LLMs Think in Shapes: Do Words Have Geometry?

This paper proposes a theory of how large language models (LLMs) represent features as manifolds, geometric shapes in the model's internal representation space. They suggest that cosine similarity between representations reflects the distance between features, and offer some supporting evidence by analyzing text embeddings and activations from models like GPT2-small and text-embedding-large-3.

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Imagine words as points in a complex shape inside a computer's brain. This study suggests these shapes reflect the relationships between words, with similar words closer together on the shape.

Posibles conflictos de intereses

None identified

Limitaciones identificadas

Limited Model/Data Scope
The study primarily focuses on a few specific models and datasets, limiting the generalizability of findings to other LLMs and domains.
Isometry Challenges
Demonstrating perfect correspondence between cosine similarity and feature distance (isometry) is difficult due to noise and the complexity of semantic similarity, impacting the robustness of the proposed framework.
Manual Metric Selection
The study relies on manually selecting metric spaces for features, which makes scaling the approach to complex features challenging. An automated metric learning method is still unexplored.
Simplified Feature Representation
Reducing complex features like "years" or "colors" to simple metric spaces may be an oversimplification of how LLMs actually represent them. The true representation might be much richer.

Explicación de la calificación

This paper presents a novel and interesting theoretical framework for understanding feature representation in LLMs. While the empirical validation is preliminary and faces some methodological challenges, the proposed concepts and hypotheses offer a valuable starting point for future research in mechanistic interpretability. The limitations regarding generalizability, difficulty proving isometry, manual metric selection, and potential oversimplification are significant, but do not negate the value of the theoretical contribution, warranting a rating of 4.

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Información del archivo

Título original: The Origins of Representation Manifolds in Large Language Models
Subido: 16 sept 2025, 18:11:03
Privacidad: Público