Leveraging rule-based machine translation knowledge for under-resourced neural machine translation models

Rule-based machine translation is a machine translation paradigm where linguistic knowledge is encoded by an expert in the form of rules that translate from source to target language. While this approach grants total control over the output of the system, the cost of formalising the needed linguistic knowledge is much higher than training a corpus-based system, where a machine learning approach is used to automatically learn to translate from examples. In this paper, we describe different approaches to leverage the information contained in rulebased machine translation systems to improve a corpus-based one, namely, a neural machine translation model, with a focus on a low-resource scenario. Our results suggest that adding morphological information to the source language is as effective as using subword units in this particular setting.This publication has emanated from research supported in part by a research grant from Science Foundation Ireland (SFI) under Grant Number SFI/12/RC/2289, co-funded by the European Regional Development Fund, and the Enterprise Ireland (EI) Innovation Partnership Programme under grant agreement No IP20180729, NURS – Neural Machine Translation for Under-Resourced Scenariospeer-reviewed2019-08-1

Leveraging rule-based machine translation knowledge for under-resourced neural machine translation models

Rule-based machine translation is a machine translation paradigm where linguistic knowledge is encoded by an expert in the form of rules that translate from source to target language. While this approach grants total control over the output of the system, the cost of formalising the needed linguistic knowledge is much higher than training a corpus-based system, where a machine learning approach is used to automatically learn to translate from examples. In this paper, we describe different approaches to leverage the information contained in rulebased machine translation systems to improve a corpus-based one, namely, a neural machine translation model, with a focus on a low-resource scenario. Our results suggest that adding morphological information to the source language is as effective as using subword units in this particular setting.This publication has emanated from research supported in part by a research grant from Science Foundation Ireland (SFI) under Grant Number SFI/12/RC/2289, co-funded by the European Regional Development Fund, and the Enterprise Ireland (EI) Innovation Partnership Programme under grant agreement No IP20180729, NURS – Neural Machine Translation for Under-Resourced Scenarios2019-08-1