SUPERB-SG: Enhanced Speech processing Universal PERformance Benchmark for Semantic and Generative Capabilities
Hsiang-Sheng TsaiHeng-Jui ChangWen-Chin HuangZili HuangKushal LakhotiaShu-Wen YangShuyan DongAndy T. LiuCheng-I LaiJiatong Shi
Presents SUPERB-SG, an expanded speech benchmark that adds challenging semantic and generative tasks to standard evaluation suites, providing a computationally efficient protocol to test how well frozen self-supervised models generalize across diverse speech processing applications.
Transfer learning using self-supervised learning models has rapidly advanced speech processing by learning rich representations from unlabelled audio data. However, previous benchmarking frameworks like SUPERB primarily evaluated these models on basic classification and shallow linguistic tasks. This left significant uncertainty regarding how well pre-trained models handle more complex, real-world requirements such as high-level semantics, multilingual translation, and audio generation.
The article introduces and evaluates SUPERB-SG, an enhanced benchmark designed to rigorously assess the semantic and generative capabilities of speech pre-trained models across diverse, challenging tasks. To provide an accessible, compute-efficient, and standardized evaluation, the framework freezes upstream pre-trained model weights and trains only lightweight task-specific prediction heads using a weighted-sum mechanism across model layers. The benchmark tests 15 distinct upstream models across five challenging downstream tasks: speech translation, out-of-domain automatic speech recognition across multiple languages and spontaneous speech, voice conversion, speech separation, and speech enhancement.
The evaluation produced several critical findings. First, no single pre-trained model universally dominates all tasks. However, HuBERT Large and wav2vec 2.0 Large consistently achieve the best overall results on tasks requiring deep semantic and linguistic understanding, such as speech translation and out-of-domain speech recognition. Second, for low-level audio generation and enhancement tasks like speech separation and speech enhancement, complex self-supervised models provide minimal improvement over traditional baseline features like Log Mel-Filterbanks, showing that high-level abstract representations do not substantially benefit raw acoustic reconstruction. Third, correlation and clustering analyses revealed strong alignment among content-heavy tasks, while separation and enhancement tasks clustered separately as they depend primarily on low-level acoustic details. Finally, robustness experiments demonstrated that upstream model performance rankings remain highly consistent across varying downstream model sizes and when training data is reduced to as low as 5%, though models fail across tasks when supervision is reduced to 1%.
These findings indicate that choosing a speech foundation model requires careful alignment with the target application rather than assuming the largest self-supervised model is universally superior. For high-level semantic and recognition systems, adopting advanced models like HuBERT Large provides substantial performance gains and cost efficiencies over training models from scratch. Conversely, for low-level audio enhancement and separation pipelines, relying on lightweight traditional acoustic baselines can reduce computational overhead without sacrificing quality. Decision-makers should leverage the open-source SUPERB-SG framework to benchmark customized models under resource-constrained conditions while ensuring downstream applications maintain sufficient labelled supervision for task-specific adaptation.
- Paper: WavLM: Large-Scale Self-Supervised Pre-Training for Full Stack Speech Processing, Sanyuan Chen et al. (2021). WavLM establishes key self-supervised speech representation pre-training objectives and evaluates them on the original SUPERB benchmark, providing essential context for the semantic and generative extensions in SUPERB-SG.
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