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arXiv · 2408.09933

SZU-AFS Antispoofing System for the ASVspoof 5 Challenge

Yuxiong Xu·Jiafeng Zhong·Sengui Zheng·Zefeng Liu·Bin Li
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Abstract

This paper presents the SZU-AFS anti-spoofing system, designed for Track 1 of the ASVspoof 5 Challenge under open conditions. The system is built with four stages: selecting a baseline model, exploring effective data augmentation (DA) methods for fine-tuning, applying a co-enhancement strategy based on gradient norm aware minimization (GAM) for secondary fine-tuning, and fusing logits scores from the two best-performing fine-tuned models. The system utilizes the Wav2Vec2 front-end feature extractor and the AASIST back-end classifier as the baseline model. During model fine-tuning, three distinct DA policies have been investigated: single-DA, random-DA, and cascade-DA. Moreover, the employed GAM-based co-enhancement strategy, designed to fine-tune the augmented model at both data and optimizer levels, helps the Adam optimizer find flatter minima, thereby boosting model generalization. Overall, the final fusion system achieves a minDCF of 0.115 and an EER of 4.04% on the evaluation set.

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Yuxiong Xu, Jiafeng Zhong, Sengui Zheng, Zefeng Liu, Bin Li. 2024-08-19. SZU-AFS Antispoofing System for the ASVspoof 5 Challenge. https://arxiv.org/abs/2408.09933

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