arXiv Computation and Language By Mengzhe Geng, Jinxi Ji, Junhao Xu

Text Scores Do Not Establish Performance on Lexically Non-Diagnostic Speech Tasks: A Qwen2-Audio Quantization Case Study

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The study evaluates Qwen2‑Audio‑7B‑Instruct quantization at mixed 4/8‑bit settings on English‑to‑German translation and emotion recognition tasks. BLEU and chrF scores relative to FP16 show no significant difference, yet absolute accuracy on RAVDESS drops by 3.71% for 6‑bit and 1.17% for 7‑bit, with the 6‑bit interval statistically significant. The results demonstrate that text‑output metrics alone cannot confirm performance preservation on speech tasks where labels cannot be inferred from transcripts.

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