Persistent Topological Features in Large Language Models

• URL: http://arxiv.org/abs/2410.11042v1
• Date: Mon, 14 Oct 2024 19:46:23 GMT
• Title: Persistent Topological Features in Large Language Models
• Authors: Yuri Gardinazzi, Giada Panerai, Karthik Viswanathan, Alessio Ansuini, Alberto Cazzaniga, Matteo Biagetti,
• Abstract summary: We introduce persistence similarity, a new metric that quantifies the persistence and transformation of topological features. Unlike traditional similarity measures, our approach captures the entire evolutionary trajectory of these features. As a practical application, we leverage persistence similarity to identify and prune redundant layers.
• Score: 0.6597195879147556
• License:
• Abstract: Understanding the decision-making processes of large language models (LLMs) is critical given their widespread applications. Towards this goal, describing the topological and geometrical properties of internal representations has recently provided valuable insights. For a more comprehensive characterization of these inherently complex spaces, we present a novel framework based on zigzag persistence, a method in topological data analysis (TDA) well-suited for describing data undergoing dynamic transformations across layers. Within this framework, we introduce persistence similarity, a new metric that quantifies the persistence and transformation of topological features such as $p$-cycles throughout the model layers. Unlike traditional similarity measures, our approach captures the entire evolutionary trajectory of these features, providing deeper insights into the internal workings of LLMs. As a practical application, we leverage persistence similarity to identify and prune redundant layers, demonstrating comparable performance to state-of-the-art methods across several benchmark datasets. Additionally, our analysis reveals consistent topological behaviors across various models and hyperparameter settings, suggesting a universal structure in LLM internal representations.

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