Neural Machine Translation of Rare Words with Subword Units

Authors: Rico Sennrich, Barry Haddow, Alexandra Birch

accepted at ACL 2016; new in this version: figure 3
License: CC BY 4.0

Results of the summarizing process for the arXiv paper: 1508.07909v5

  • Comprehensive Summary
  • Key points
  • Layman's Summary
  • Blog article
In this paper, the authors propose a new approach for translating rare and unknown words in neural machine translation (NMT) models. They argue that certain word classes can be translated more effectively through smaller units rather than whole words and discuss different word segmentation techniques. Empirically demonstrating that subword models outperform a back-off dictionary baseline in English-German and English-Russian translation tasks, the authors analyze 100 rare tokens in their German training data and find that the majority of these tokens can potentially be translated from English using smaller units. The paper provides empirical support for the hypothesis that segmenting rare words into appropriate subword units is sufficient for the NMT model to learn transparent translations and generalize this knowledge to translate unseen words. Additionally, related work on handling unknown words in statistical machine translation is discussed. Overall, the proposed approach offers a simpler and more effective solution for translating rare and unknown words in NMT models.
AI-generated keywords: Neural Machine Translation Subword Units Word Segmentation Rare Words Unknown Words

AI-generated Key Points

  • Authors propose a new approach for translating rare and unknown words in NMT models
  • Certain word classes can be translated more effectively through smaller units rather than whole words
  • Different word segmentation techniques are discussed
  • Subword models outperform a back-off dictionary baseline in English-German and English-Russian translation tasks
  • Analysis of 100 rare tokens in German training data shows that the majority can potentially be translated using smaller units
  • Segmenting rare words into appropriate subword units is sufficient for the NMT model to learn transparent translations and generalize this knowledge to translate unseen words
  • Related work on handling unknown words in statistical machine translation is discussed
  • Proposed approach offers a simpler and more effective solution for translating rare and unknown words in NMT models.
Also access our AI generated: Comprehensive summary, Lay summary, Blog-like article; or ask questions about this paper to our AI assistant.

Abstract: Neural machine translation (NMT) models typically operate with a fixed vocabulary, but translation is an open-vocabulary problem. Previous work addresses the translation of out-of-vocabulary words by backing off to a dictionary. In this paper, we introduce a simpler and more effective approach, making the NMT model capable of open-vocabulary translation by encoding rare and unknown words as sequences of subword units. This is based on the intuition that various word classes are translatable via smaller units than words, for instance names (via character copying or transliteration), compounds (via compositional translation), and cognates and loanwords (via phonological and morphological transformations). We discuss the suitability of different word segmentation techniques, including simple character n-gram models and a segmentation based on the byte pair encoding compression algorithm, and empirically show that subword models improve over a back-off dictionary baseline for the WMT 15 translation tasks English-German and English-Russian by 1.1 and 1.3 BLEU, respectively.

Submitted to arXiv on 31 Aug. 2015

Tools for this paper

Explain it differently 3 free rewrites left today
Export BibTeX · RIS (Zotero, Mendeley, EndNote) · Markdown (Notion, Obsidian) · Premium
Citation alerts Premium
Journal club Slides to present it Premium
For journalists Press kit and hype check Premium

Ask questions about this paper to our AI assistant

You can also chat with multiple papers at once here.

Figures and plots

Ask about a figure by number or use its question button to request visual analysis. Up to two figures and four image panels per question. Values read from plots are approximate; check the original data.

AI assistant instructions?

Assess the quality of the AI-generated content by voting

Score: 0

Why do we need votes?

Votes are used to determine whether we need to re-run our summarizing tools. If the count reaches -10, our tools can be restarted.

The previous summary was created more than a year ago and can be re-run (if necessary) by clicking on the Run button below.

Similar papers summarized with our AI tools

Navigate through even more similar papers through a

tree representation

Disclaimer: The AI-based summarization tool and virtual assistant provided on this website may not always provide accurate and complete summaries or responses. We encourage you to carefully review and evaluate the generated content to ensure its quality and relevance to your needs.