基于层次注意力机制和门机制的属性级别情感分析

Aspect-level Sentiment Analysis Based on Hierarchical Attention and Gate Networks

近年来,作为细粒度的属性级别情感分析在商业界和学术界受到越来越多的关注,其目的在于识别一个句子中多个属性词所对应的情感极性。目前,在解决属性级别情感分析问题的绝大多数工作都集中在注意力机制的设计上,以此突出上下文和属性词中不同词对于属性级别情感分析的贡献,同时使上下文和属性词之间相互关联。该文提出使用层次注意力机制和门机制处理属性级别情感分析任务,在得到属性词的隐藏状态之后,通过注意力机制得到属性词新的表示,然后利用属性词新的表示和注意力机制进一步得到上下文新的表示,层次注意力机制的设计使得上下文和属性词的表达更加准确;同时通过门机制选择对属性词而言上下文中有用的信息,以此丰富上下文的表达,在SemEval 2014 Task 4和Twitter数据集上的实验结果表明了该文提出模型的有效性。

As a fine-grained task,aspect-level sentiment analysis is aimed at identifying the sentiment polarity corresponding to the specific aspect in a sentence.Most existing works are focused on the design of attention network to highlight the different contributions of words in context and associate the context and the aspect properly.In this paper,we put forward to combine the hierarchical attention and gate networks to process aspect-level sentiment analysis task.we obtain the representation of the context through the attention between the context and a new representation of the aspect weighted by the context.At the same time,the useful information in the context is selected through the gate networks to enrich the representation of the context.The design of hierarchical attention gate networks is to make the representation of the context and the aspect more accurate.The experimental results on the Sem-Eval 2014 Task4 and Twitter show the validity of the model.