Machine translation traditionally refers to translating from a single source language into a single target language. In recent years, the field has moved towards large neural models translating from or into many languages. As the input and output languages vary, the model must be correctly cued to translate into the correct target language. This is typically done by prefixing language tokens onto the source or target sequence. A single token’s content can denote the source language, target language, or language pair. The location and content of the prefix varies and many approaches exist without much justification towards one method or another. As guidance to researchers and directions for future work, we present a series of comprehensive experiments that show how the positioning and type of a target language prefix token affects translation performance. We show that source-side prefixes consistently improve performance. Further, we find that best language token content varies dependent on the supported language set.

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The Effects of Language Token Prefixing for Multilingual Machine Translation

The sentence is a fundamental unit of text processing.
Yet sentences in the wild are commonly encountered not in isolation, but unsegmented within larger paragraphs and documents.
Therefore, the first step in many NLP pipelines is \emph{sentence segmentation}.
Despite its importance, this step is the subject of relatively little research.
There are no standard test sets or even methods for evaluation, leaving researchers and engineers without a clear footing for evaluating and selecting models for the task.
Existing tools have relatively small language coverage, and efforts to extend them to other languages are often ad hoc.

We introduce a modern context-based modeling approach that provides a solution to the problem of segmenting punctuated text in many languages, and show how it can be trained on noisily-annotated data. 
We also establish a new 23-language multilingual evaluation set.
Our approach exceeds high baselines set by existing methods on prior English corpora (WSJ and Brown corpora), and also performs well on average on our new evaluation set.
We release our tool, ersatz, as open source.

A unified approach to sentence segmentation of punctuated text in many languages

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The AACL, Asia-Pacific Chapter of the Association for Computational Linguistics, and the AFNLP, Asian Federation of Natural Language Processing, invite you to participate in the 1st Conference of the Asia-Pacific Chapter of the Association for Computational Linguistics (AACL) and the 10th International Joint Conference on Natural Language Processing (IJCNLP). 

**Session Chair: ** Jiatao Gu 
**Session Volunteer: ** Ricardo Muñoz Sánchez

12A: Machine Translation and Multilinguality #7

technical paper

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The Effects of Language Token Prefixing for Multilingual Machine Translation

A unified approach to sentence segmentation of punctuated text in many languages

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