基于多任务学习的时序多模态情感分析模型

Sequential multimodal sentiment analysis model based on multi-task learning

针对时序多模态情感分析中存在的单模态特征表示和跨模态特征融合问题,结合多头注意力机制,提出一种基于多任务学习的情感分析模型。首先,使用卷积神经网络(CNN)、双向门控循环神经网络(Bi GRU)和多头自注意力(MHSA)实现了对时序单模态的特征表示;然后,利用多头注意力实现跨模态的双向信息融合;最后,基于多任务学习思想,添加额外的情感极性分类和情感强度回归任务作为辅助,从而提升情感评分回归主任务的综合性能。实验结果表明,相较于多模态分解模型,所提模型的二分类准确度指标在CMU-MOSEI和CMU-MOSI多模态数据集上分别提高了7.8个百分点和3.1个百分点。该模型适用于多模态场景下的情感分析问题,能够为商品推荐、股市预测、舆情监控等应用提供决策支持。

Considering the issues of unimodal feature representation and cross-modal feature fusion in sequential multimodal sentiment analysis,a multi-task learning based sentiment analysis model was proposed by combining with multi-head attention mechanism.Firstly,Convolution Neural Network(CNN),Bidirectional Gated Recurrent Unit(BiGRU)and Multi-Head Self-Attention(MHSA)were used to realize the sequential unimodal feature representation.Secondly,the bidirectional cross-modal information was fused by multi-head attention.Finally,based on multi-task learning,the sentiment polarity classification and sentiment intensity regression were added as auxiliary tasks to improve the comprehensive performance of the main task of sentiment score regression.Experimental results demonstrate that the proposed model improves the accuracy of binary classification by 7.8 percentage points and 3.1 percentage points respectively on CMU Multimodal Opinion Sentiment and Emotion Intensity(CMU-MOSEI)and CMU Multimodal Opinion level Sentiment Intensity(CMU-MOSI)datasets compared with multimodal factorization model.Therefore,the proposed model is applicable for the sentiment analysis problems under multimodal scenarios,and can provide the decision supports for product recommendation,stock market forecasting,public opinion monitoring and other relevant applications.