End-to-end Joint Punctuated and Normalized ASR with a Limited Amount of Punctuated Training Data - Department of Natural Language Processing & Knowledge Discovery
Pré-Publication, Document De Travail Année : 2023

End-to-end Joint Punctuated and Normalized ASR with a Limited Amount of Punctuated Training Data

Résumé

Joint punctuated and normalized automatic speech recognition (ASR), that outputs transcripts with and without punctuation and casing, remains challenging due to the lack of paired speech and punctuated text data in most ASR corpora. We propose two approaches to train an end-to-end joint punctuated and normalized ASR system using limited punctuated data. The first approach uses a language model to convert normalized training transcripts into punctuated transcripts. This achieves a better performance on out-of-domain test data, with up to 17% relative Punctuation-Case-aware Word Error Rate (PC-WER) reduction. The second approach uses a single decoder conditioned on the type of output. This yields a 42% relative PC-WER reduction compared to Whisper-base and a 4% relative (normalized) WER reduction compared to the normalized output of a punctuated-only model. Additionally, our proposed model demonstrates the feasibility of a joint ASR system using as little as 5% punctuated training data with a moderate (2.42% absolute) PC-WER increase.
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Dates et versions

hal-04304642 , version 1 (24-11-2023)
hal-04304642 , version 2 (28-10-2024)

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Can Cui, Imran Ahamad Sheikh, Mostafa Sadeghi, Emmanuel Vincent. End-to-end Joint Punctuated and Normalized ASR with a Limited Amount of Punctuated Training Data. 2023. ⟨hal-04304642v2⟩
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