Hierarchically stacked graph convolution for emotion recognition in conversation
Binqiang Wang, Gang Dong, Yaqian Zhao, Rengang Li, Qichun Cao, Kekun Hu, Dongdong Jiang · Knowledge-Based Systems · 2023
Accurate emotion recognition can drive the robot to understand human affection intentions precisely and deliver the emotional response when communicating with a person. Recently, graph structure has been applied to explicitly capture the self and inter-dependencies of speakers in the conversation. However, the performance of the method is limited by inadequate discriminative information extraction based on naive graph convolution. In this paper, we propose a novel Hierarchically Stacked Graph Convolution Framework (HSGCF), which leverages hierarchical structure to extract emotional discriminative features. The proposed HSGCF uses five graph convolution layers connected hierarchically to establish a more discriminative emotional feature extractor. More importantly, to mitigate the over-smooth problem caused by deeper networks, Transformer structures with residual connection are introduced into HSGCF. Experimental results on the IEMOCAP benchmark dataset indicate the proposed framework achieves a 4.12% improvement in accuracy and a 4.80% improvement in F1 score compared with the baseline method.