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 [BibTeX] [Marc21]
Implementing contextual biasing in GPU decoder for online ASR
Type of publication: Conference paper
Citation: Iuliia_INTERSPEECH_2023
Publication status: Accepted
Booktitle: Proc. Interspeech 2023
Year: 2023
Crossref: Iuliia_Idiap-RR-02-2023:
Abstract: GPU decoding significantly accelerates the output of ASR predictions. While GPUs are already being used for online ASR decoding, post-processing and rescoring on GPUs have not been properly investigated yet. Rescoring with available contextual information can considerably improve ASR predictions. Previous studies have proven the viability of lattice rescoring in decoding and biasing language model (LM) weights in offline and online CPU scenarios. In real-time GPU decoding, partial recognition hypotheses are produced without lattice generation, which makes the implementation of biasing more complex. The paper proposes and describes an approach to integrate contextual biasing in real-time GPU decoding while exploiting the standard Kaldi GPU decoder. Besides the biasing of partial ASR predictions, our approach also permits dynamic context switching allowing a flexible rescoring per each speech segment directly on GPU. The code is publicly released1 and tested with open-sourced test sets.
Keywords: Contextual Adaptation, finite-state transducers, GPU decoding, real-time speech recognition
Projects Idiap
Authors Iuliia, Nigmatulina
Madikeri, Srikanth
Motlicek, Petr
Juan, Zuluaga-Gomez.
S, Karthik Pandia D
Ganapathiraju, Aravind
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  • Iuliia_INTERSPEECH_2023.pdf