Fleurs-SLU: A Massively Multilingual Benchmark for Spoken Language Understanding

• URL: http://arxiv.org/abs/2501.06117v2
• Date: Wed, 19 Feb 2025 06:23:54 GMT
• Title: Fleurs-SLU: A Massively Multilingual Benchmark for Spoken Language Understanding
• Authors: Fabian David Schmidt, Ivan Vulić, Goran Glavaš, David Ifeoluwa Adelani,
• Abstract summary: Spoken language understanding (SLU) is indispensable for half of all living languages that lack a formal writing system. We evaluate end-to-end speech classification models and cascaded systems that combine speech-to-text transcription with subsequent classification by large language models on Fleurs-SLU. We find a strong correlation between robust multilingual ASR, effective speech-to-text translation, and strong multilingual SLU.
• Score: 7.973470389066757
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• Abstract: Spoken language understanding (SLU) is indispensable for half of all living languages that lack a formal writing system, since these languages cannot pair automatic speech recognition (ASR) with language models to benefit from language technology. Even if low-resource languages possess a writing system, ASR for these languages remains unreliable due to limited bimodal speech and text training data. Better SLU can strengthen the robustness of massively multilingual ASR by levering language semantics to disambiguate utterances via context or exploiting semantic similarities across languages. However, the evaluation of multilingual SLU remains limited to shallow tasks such as intent classification or language identification. To address this, we present Fleurs-SLU, a multilingual SLU benchmark that encompasses (i) 692 hours of speech for topical utterance classification in 102 languages and (ii) multiple-choice question answering through listening comprehension spanning 944 hours of speech across 92 languages. We extensively evaluate both end-to-end speech classification models and cascaded systems that combine speech-to-text transcription with subsequent classification by large language models on Fleurs-SLU. Our results show that cascaded systems exhibit greater robustness in multilingual SLU tasks, though speech encoders can achieve competitive performance in topical speech classification when appropriately pre-trained. We further find a strong correlation between robust multilingual ASR, effective speech-to-text translation, and strong multilingual SLU, highlighting the mutual benefits between acoustic and semantic speech representations.

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