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arXiv · 2511.14307

Audio Question Answering with GRPO-Based Fine-Tuning and Calibrated Segment-Level Predictions

Marcel Gibier·Nolwenn Celton·Raphaël Duroselle·Pierre Serrano·Olivier Boeffard·Jean-François Bonastre
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Abstract

In this report, we describe our submission to Track 5 of the DCASE 2025 Challenge for the task of Audio Question Answering(AQA). Our system leverages the SSL backbone BEATs to extract frame-level audio features, which are then processed by a classification head to generate segment-level predictions of acoustic events, following the Audioset ontology. These segment-level predictions are subsequently calibrated before producing event-level predictions. Finally, these predictions are incorporated into a structured prompt, along with the question and candidate answers. This prompt is then fed to a fine-tuned version of Qwen2.5-7B-Instruct, trained using the GRPO algorithm with a simple reward function. Our method achieves an accuracy of 62.6 % on the development set, demonstrating the effectiveness of combining acoustic event reasoning with instruction-tuned large language models for AQA.

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Marcel Gibier, Nolwenn Celton, Raphaël Duroselle, Pierre Serrano, Olivier Boeffard, Jean-François Bonastre. 2025-11-18. Audio Question Answering with GRPO-Based Fine-Tuning and Calibrated Segment-Level Predictions. https://arxiv.org/abs/2511.14307

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