Joint Speech Transcription and Translation: Pseudo-Labeling with Out-of-Distribution Data
This addresses data deficiency for speech processing tasks, but it is incremental as it builds on existing pseudo-labeling methods.
The paper tackled the problem of data scarcity in joint speech transcription and translation by using pseudo-labeling with out-of-domain unlabeled data, achieving improvements of up to 0.6% absolute WER and 2.2 BLEU points.
Self-training has been shown to be helpful in addressing data scarcity for many domains, including vision, speech, and language. Specifically, self-training, or pseudo-labeling, labels unsupervised data and adds that to the training pool. In this work, we investigate and use pseudo-labeling for a recently proposed novel setup: joint transcription and translation of speech, which suffers from an absence of sufficient data resources. We show that under such data-deficient circumstances, the unlabeled data can significantly vary in domain from the supervised data, which results in pseudo-label quality degradation. We investigate two categories of remedies that require no additional supervision and target the domain mismatch: pseudo-label filtering and data augmentation. We show that pseudo-label analysis and processing as such results in additional gains on top of the vanilla pseudo-labeling setup resulting in total improvements of up to 0.6% absolute WER and 2.2 BLEU points.