EdiT5: Semi-Autoregressive Text Editing with T5 Warm-Start

Jonathan Mallinson, Jakub Adamek, Eric Malmi, Aliaksei Severyn


Abstract
We present EdiT5 - a novel semi-autoregressive text-editing approach designed to combine the strengths of non-autoregressive text-editing and autoregressive decoding. EdiT5 is faster at inference times than conventional sequence-to-sequence (seq2seq) models, while being capable of modeling flexible input-output transformations.This is achieved by decomposing the generation process into three sub-tasks: (1) tagging to decide on the subset of input tokens to be preserved in the output, (2) re-ordering to define their order in the output text, and (3) insertion to infill the missing tokens that are not present in the input. The tagging and re-ordering steps, which are responsible for generating the largest portion of the output, are non-autoregressive, while the insertion uses an autoregressive decoder.Depending on the task, EdiT5 requires significantly fewer autoregressive steps demonstrating speedups of up to 25x when compared to classic seq2seq models. Quality-wise, EdiT5 is initialized with a pre-trained T5 checkpoint yielding comparable performance to T5 in high-resource settings and clearly outperforms it on low-resource settings when evaluated on three NLG tasks: Sentence Fusion, Grammatical Error Correction, and Decontextualization.
Anthology ID:
2022.findings-emnlp.156
Volume:
Findings of the Association for Computational Linguistics: EMNLP 2022
Month:
December
Year:
2022
Address:
Abu Dhabi, United Arab Emirates
Venue:
Findings
SIG:
Publisher:
Association for Computational Linguistics
Note:
Pages:
2126–2138
Language:
URL:
https://aclanthology.org/2022.findings-emnlp.156
DOI:
Bibkey:
Cite (ACL):
Jonathan Mallinson, Jakub Adamek, Eric Malmi, and Aliaksei Severyn. 2022. EdiT5: Semi-Autoregressive Text Editing with T5 Warm-Start. In Findings of the Association for Computational Linguistics: EMNLP 2022, pages 2126–2138, Abu Dhabi, United Arab Emirates. Association for Computational Linguistics.
Cite (Informal):
EdiT5: Semi-Autoregressive Text Editing with T5 Warm-Start (Mallinson et al., Findings 2022)
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PDF:
https://preview.aclanthology.org/ingestion-script-update/2022.findings-emnlp.156.pdf