We propose a neural reranking system for named entity recognition (NER). The
basic idea is to leverage recurrent neural network models to learn
sentence-level patterns that involve named entity mentions. In particular,
given an output sentence produced by a baseline NER model, we replace all
entity mentions, such as \textit{Barack Obama}, into their entity types, such
as \textit{PER}. The resulting sentence patterns contain direct output
information, yet is less sparse without specific named entities. For example,
"PER was born in LOC" can be such a pattern. LSTM and CNN structures are
utilised for learning deep representations of such sentences for reranking.
Results show that our system can significantly improve the NER accuracies over
two different baselines, giving the best reported results on a standard
benchmark.

本文提出了一种神经再排序系统，用于命名实体识别，利用递归神经网络模型来学习涉及命名实体提及的句子级模式，使用 LSTM 和 CNN 结构来学习这些句子的深层表示以进行再排序。实验结果表明，我们的系统可以显著提高命名实体识别准确率，超过了两个不同的基线，并在标准基准测试中报告了最好的结果。