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arXiv · 2412.16963

LH-Mix: Local Hierarchy Correlation Guided Mixup over Hierarchical Prompt Tuning

Fanshuang Kong·Richong Zhang·Ziqiao Wang
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Abstract

Hierarchical text classification (HTC) aims to assign one or more labels in the hierarchy for each text. Many methods represent this structure as a global hierarchy, leading to redundant graph structures. To address this, incorporating a text-specific local hierarchy is essential. However, existing approaches often model this local hierarchy as a sequence, focusing on explicit parent-child relationships while ignoring implicit correlations among sibling/peer relationships. In this paper, we first integrate local hierarchies into a manual depth-level prompt to capture parent-child relationships. We then apply Mixup to this hierarchical prompt tuning scheme to improve the latent correlation within sibling/peer relationships. Notably, we propose a novel Mixup ratio guided by local hierarchy correlation to effectively capture intrinsic correlations. This Local Hierarchy Mixup (LH-Mix) model demonstrates remarkable performance across three widely-used datasets.

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Fanshuang Kong, Richong Zhang, Ziqiao Wang. 2025-02-23. LH-Mix: Local Hierarchy Correlation Guided Mixup over Hierarchical Prompt Tuning. https://arxiv.org/abs/2412.16963

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