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arXiv 2006.01112cs.CLcs.LGcs.NEstat.ML
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基于Markov Transformers的级联文本生成

Cascaded Text Generation with Markov Transformers

Harvard University(哈佛大学);Cornell University(康奈尔大学)

Yuntian Deng, Alexander M. Rush

摘要:

神经文本生成的两种主要方法是使用串行束搜索解码的完全自回归模型和使用没有输出依赖性的并行解码的非自回归模型。本文提出了一个具有次线性并行时间生成的自回归模型。注意到有界上下文的条件随机场可以并行解码,我们提出了一种高效的级联解码方法,用于生成高质量的输出。为了参数化这个级联,我们引入了一个马尔可夫Transformer,一个流行的完全自回归模型的变体,允许我们同时解码特定的自回归上下文截止。这种方法只需要对标准自回归训练进行很小的修改,同时与五个机器翻译数据集上的现有方法相比,显示出具有竞争力的准确性/速度权衡。

英文摘要:

The two dominant approaches to neural text generation are fully autoregressive models, using serial beam search decoding, and non-autoregressive models, using parallel decoding with no output dependencies. This work proposes an autoregressive model with sub-linear parallel time generation. Noting that conditional random fields with bounded context can be decoded in parallel, we propose an efficient cascaded decoding approach for generating high-quality output. To parameterize this cascade, we introduce a Markov transformer, a variant of the popular fully autoregressive model that allows us to simultaneously decode with specific autoregressive context cutoffs. This approach requires only a small modification from standard autoregressive training, while showing competitive accuracy/speed tradeoff compared to existing methods on five machine translation datasets.

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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