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- W3199610983 abstract "Confidence measure is a performance index of particular importance for automatic speech recognition (ASR) systems deployed in real-world scenarios. In the present study, utterance-level neural confidence measure (NCM) in end-to-end automatic speech recognition (E2E ASR) is investigated. The E2E system adopts the joint CTC-attention Transformer architecture. The prediction of NCM is formulated as a task of binary classification, i.e., accept/reject the input utterance, based on a set of predictor features acquired during the ASR decoding process. The investigation is focused on evaluating and comparing the efficacies of predictor features that are derived from different internal and external modules of the E2E system. Experiments are carried out on children speech, for which state-of-the-art ASR systems show less than satisfactory performance and robust confidence measure is particularly useful. It is noted that predictor features related to acoustic information of speech play a more important role in estimating confidence measure than those related to linguistic information. N-best score features show significantly better performance than single-best ones. It has also been shown that the metrics of EER and AUC are not appropriate to evaluate the NCM of a mismatched ASR with significant performance gap." @default.
- W3199610983 created "2021-09-27" @default.
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- W3199610983 date "2021-12-13" @default.
- W3199610983 modified "2023-10-18" @default.
- W3199610983 title "Utterance-Level Neural Confidence Measure for End-to-End Children Speech Recognition" @default.
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- W3199610983 doi "https://doi.org/10.1109/asru51503.2021.9688213" @default.
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