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arxiv: 2604.25591 · v1 · submitted 2026-04-28 · 📡 eess.AS · cs.AI· cs.CL· cs.LG· cs.SD

Recognition: unknown

Walking Through Uncertainty: An Empirical Study of Uncertainty Estimation for Audio-Aware Large Language Models

Chun-Yi Kuan, Hung-yi Lee, Wei-Ping Huang

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Pith reviewed 2026-05-07 14:24 UTC · model grok-4.3

classification 📡 eess.AS cs.AIcs.CLcs.LGcs.SD
keywords uncertainty estimationaudio-aware LLMssemantic entropyhallucination detectionaudio reasoningtrustworthinessmultimodal modelsadaptive inference
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The pith

Semantic-level and verification-based uncertainty methods outperform token-level baselines for audio-aware LLMs on general reasoning tasks.

A machine-rendered reading of the paper's core claim, the machinery that carries it, and where it could break.

The paper presents the first systematic empirical study of uncertainty estimation methods applied to audio-aware large language models that process both sound inputs and text reasoning. It evaluates five representative techniques across multiple models and settings that include general audio understanding, reasoning tasks, hallucination detection, and unanswerable question answering. Results indicate that semantic-level and verification-based methods deliver more reliable uncertainty signals than token-level entropy baselines in standard reasoning scenarios. On trustworthiness-focused benchmarks the advantage becomes inconsistent and depends on the particular model and benchmark. This matters because audio-language systems are deployed in settings where overconfident or fabricated outputs can lead to errors, and improved uncertainty awareness could support safer adaptive behavior.

Core claim

The authors establish through systematic experiments that semantic-level and verification-based uncertainty estimation methods consistently outperform token-level baselines on general audio reasoning benchmarks for audio-aware large language models, whereas on trustworthiness-oriented benchmarks such as hallucination detection and unanswerable question answering the relative effectiveness of the methods is more dependent on the model and the specific benchmark.

What carries the argument

Empirical benchmarking of five uncertainty estimation methods (predictive entropy, length-normalized entropy, semantic entropy, discrete semantic entropy, and P(True)) applied to multiple audio-aware LLMs across audio-conditioned generation tasks.

Load-bearing premise

The assumption that the chosen models, benchmarks, and audio-conditioned generation settings adequately represent the perceptual ambiguity and cross-modal grounding challenges without introducing implementation-specific biases.

What would settle it

An experiment on new audio datasets or additional ALLMs in which token-level entropy methods achieve higher calibration or better hallucination detection accuracy than semantic-level methods on general reasoning tasks would falsify the main result.

Figures

Figures reproduced from arXiv: 2604.25591 by Chun-Yi Kuan, Hung-yi Lee, Wei-Ping Huang.

Figure 1
Figure 1. Figure 1: Cost–accuracy Pareto frontier of Reasoning vs. Adaptive inference view at source ↗
Figure 2
Figure 2. Figure 2: Reliability diagrams for Qwen2.5-Omni-7B [11] on MMAU [26], reported for both the overall benchmark and three domains: sound, speech, and music. Each point corresponds to an equal-mass bin. Lower ECE and Brier score indicate better calibration view at source ↗
Figure 3
Figure 3. Figure 3: Reliability diagrams for Qwen2.5-Omni-3B [11] on MMAU [26], reported for both the overall benchmark and three domains: sound, speech, and music. Each point corresponds to an equal-mass bin. Lower ECE and Brier score indicate better calibration view at source ↗
Figure 4
Figure 4. Figure 4: Reliability diagrams for Qwen2.5-Omni-7B [11] on MMAR [27], reported for both the overall benchmark and the two benchmark-defined task categories: Perception and Semantic. Each point corresponds to an equal-mass bin. Lower ECE and Brier score indicate better calibration view at source ↗
Figure 5
Figure 5. Figure 5: Reliability diagrams for Qwen2.5-Omni-3B [11] on MMAR [27], reported for both the overall benchmark and the two benchmark-defined task categories: Perception and Semantic. Each point corresponds to an equal-mass bin. Lower ECE and Brier score indicate better calibration view at source ↗
Figure 6
Figure 6. Figure 6: Reliability diagrams for Qwen2.5-Omni-7B [11] on MMSU [29], reported for both the overall benchmark and the two task categories: Perception and Reasoning. Each point corresponds to an equal-mass bin. Lower ECE and Brier score indicate better calibration view at source ↗
Figure 7
Figure 7. Figure 7: Reliability diagrams for Qwen2.5-Omni-3B [11] on MMSU [29], reported for both the overall benchmark and the two task categories: Perception and Reasoning. Each point corresponds to an equal-mass bin. Lower ECE and Brier score indicate better calibration view at source ↗
Figure 8
Figure 8. Figure 8: Reliability diagrams for Qwen2.5-Omni-7B [11] on SAKURA [30], including overall performance and four tracks: animal, emotion, language, and gender. Each point corresponds to an equal-mass bin. Lower ECE and Brier score indicate better calibration view at source ↗
Figure 9
Figure 9. Figure 9: Reliability diagrams for Qwen2.5-Omni-3B [11] on SAKURA [30], including overall performance and four tracks: animal, emotion, language, and gender. Each point corresponds to an equal-mass bin. Lower ECE and Brier score indicate better calibration view at source ↗
read the original abstract

Recent audio-aware large language models (ALLMs) have demonstrated strong capabilities across diverse audio understanding and reasoning tasks, but they still frequently produce hallucinated or overly confident outputs. While uncertainty estimation has been extensively studied in text-only LLMs, it remains largely unexplored for ALLMs, where audio-conditioned generation introduces additional challenges such as perceptual ambiguity and cross-modal grounding. In this work, we present the first systematic empirical study of uncertainty estimation in ALLMs. We benchmark five representative methods, including predictive entropy, length-normalized entropy, semantic entropy, discrete semantic entropy, and P(True), across multiple models and diverse evaluation settings spanning general audio understanding, reasoning, hallucination detection, and unanswerable question answering. Our results reveal two key findings. First, semantic-level and verification-based methods consistently outperform token-level baselines on general audio reasoning benchmarks. Second, on trustworthiness-oriented benchmarks, the relative effectiveness of uncertainty methods becomes notably more model- and benchmark-dependent, indicating that conclusions drawn from general reasoning settings do not straightforwardly transfer to hallucination and unanswerable-question scenarios. We further explore uncertainty-based adaptive inference as a potential downstream application. We hope this study provides a foundation for future research on reliable, uncertainty-aware audio-language systems.

Editorial analysis

A structured set of objections, weighed in public.

Desk editor's note, referee report, simulated authors' rebuttal, and a circularity audit. Tearing a paper down is the easy half of reading it; the pith above is the substance, this is the friction.

Referee Report

1 major / 2 minor

Summary. The manuscript presents the first systematic empirical study of uncertainty estimation for audio-aware large language models (ALLMs). It benchmarks five methods (predictive entropy, length-normalized entropy, semantic entropy, discrete semantic entropy, and P(True)) across multiple models on tasks spanning general audio understanding and reasoning, hallucination detection, and unanswerable question answering. The two main findings are that semantic-level and verification-based methods consistently outperform token-level baselines on general audio reasoning benchmarks, while relative effectiveness becomes more model- and benchmark-dependent on trustworthiness-oriented tasks; the work also explores uncertainty-based adaptive inference.

Significance. If the results hold under appropriate controls, this establishes a valuable baseline for uncertainty quantification in multimodal audio-language models and shows that text-LLM findings do not transfer directly due to perceptual ambiguity and cross-modal issues. It provides a foundation for reliable ALLM systems and adaptive inference, with credit for the broad multi-model, multi-task design.

major comments (1)
  1. [§4 (Experimental Evaluation)] §4 (Experimental Evaluation): The central claim that semantic-level and verification-based methods outperform baselines specifically due to better handling of perceptual ambiguity and cross-modal grounding requires that benchmarks systematically vary audio clarity, noise, or modality conflict while holding text prompts fixed. No such ablations or controls on audio degradation are described, so the comparison may not isolate ALLM-specific challenges from general LLM uncertainty.
minor comments (2)
  1. [Results] The results lack reported error bars, variance across runs, or statistical significance tests, which would strengthen verification of the consistency claims.
  2. [§3 (Methods)] Implementation details for audio conditioning (e.g., feature extraction, fusion mechanism) and exact benchmark compositions could be expanded for reproducibility.

Simulated Author's Rebuttal

1 responses · 0 unresolved

We thank the referee for their constructive and detailed feedback. We address the major comment below and commit to revisions that better align our claims with the experimental evidence while preserving the value of the empirical benchmarking study.

read point-by-point responses

  1. Referee: [§4 (Experimental Evaluation)] §4 (Experimental Evaluation): The central claim that semantic-level and verification-based methods outperform baselines specifically due to better handling of perceptual ambiguity and cross-modal grounding requires that benchmarks systematically vary audio clarity, noise, or modality conflict while holding text prompts fixed. No such ablations or controls on audio degradation are described, so the comparison may not isolate ALLM-specific challenges from general LLM uncertainty.

    Authors: We agree that a strong causal attribution of the observed outperformance to better handling of perceptual ambiguity and cross-modal grounding would require controlled ablations that systematically vary audio clarity, noise, or modality conflicts while holding text prompts fixed. Our study is an empirical benchmarking effort on existing audio reasoning, hallucination, and unanswerable-question datasets, which do contain real-world audio with varying perceptual quality; however, we did not introduce explicit degradation controls or modality-conflict conditions. Consequently, we cannot fully isolate ALLM-specific factors from general LLM uncertainty behaviors. In the revised manuscript we will (i) moderate the language in the abstract, introduction, and conclusion to describe the results as consistent outperformance of semantic-level and verification-based methods on audio-conditioned tasks without claiming this is 'specifically due to' perceptual or cross-modal mechanisms, and (ii) add an explicit limitations paragraph noting the absence of such controls and recommending them for future work. This constitutes a partial revision focused on textual clarification rather than new experiments. revision: partial

Circularity Check

0 steps flagged

No circularity: empirical benchmarking without derivations or self-referential predictions

full rationale

The paper is a purely empirical study that benchmarks five uncertainty estimation methods (predictive entropy, length-normalized entropy, semantic entropy, discrete semantic entropy, P(True)) on external audio reasoning and trustworthiness benchmarks across multiple ALLMs. No mathematical derivations, first-principles results, fitted parameters presented as predictions, or self-citation chains appear in the abstract or described structure. All claims rest on direct experimental comparisons to prior text-LLM methods and standard benchmarks, with no load-bearing steps that reduce to the paper's own inputs by construction. This matches the default case of an observational evaluation whose conclusions are falsifiable against independent data.

Axiom & Free-Parameter Ledger

0 free parameters · 1 axioms · 0 invented entities

This is an empirical benchmarking study that applies existing uncertainty methods without introducing new theoretical constructs, fitted parameters, or postulated entities.

axioms (1)
  • domain assumption Uncertainty estimation techniques developed for text-only LLMs remain meaningful when applied to audio-conditioned generation
    The study directly benchmarks the listed methods on ALLMs without deriving or justifying new foundations for the audio modality.

pith-pipeline@v0.9.0 · 5536 in / 1222 out tokens · 86215 ms · 2026-05-07T14:24:14.565870+00:00 · methodology

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