arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 2103.11089cs.CLcs.AI
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依赖图-串统计机器翻译

Dependency Graph-to-String Statistical Machine Translation

Huawei Technologies(华为技术有限公司);Dublin City University(都柏林城市大学)

Liangyou Li, Andy Way, Qun Liu

摘要:

我们提出了基于图的翻译模型,将源图转换为目标字符串。源图由具有额外链接的依赖树构建,以便连接非句法短语。受基于短语的模型的启发,我们首先引入了一个翻译模型,该模型将图分割成一系列不相交的子图,并通过使用束搜索从左到右组合子图翻译来生成翻译。然而,与基于短语的模型类似,该模型在短语重排序方面较弱。因此,我们进一步引入了一个基于同步节点替换语法的模型,该模型学习递归翻译规则。我们提供了两种不同的限制,使源图可以有效地解析模型的实现。实验表明,我们的基于图的模型是显着优于相应的序列和树为基础的基线。

英文摘要:

We present graph-based translation models which translate source graphs into target strings. Source graphs are constructed from dependency trees with extra links so that non-syntactic phrases are connected. Inspired by phrase-based models, we first introduce a translation model which segments a graph into a sequence of disjoint subgraphs and generates a translation by combining subgraph translations left-to-right using beam search. However, similar to phrase-based models, this model is weak at phrase reordering. Therefore, we further introduce a model based on a synchronous node replacement grammar which learns recursive translation rules. We provide two implementations of the model with different restrictions so that source graphs can be parsed efficiently. Experiments on Chinese--English and German--English show that our graph-based models are significantly better than corresponding sequence- and tree-based baselines.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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