CSMF-SPC: Multimodal Sentiment Analysis Model with Effective Context Semantic Modality Fusion and Sentiment Polarity Correction

Multimodal sentiment analysis focuses on the fusion of multiple modalities. However, modality representation learning is a key step for better modality fusion, so how to fully learn the sentiment information of non-text modalities is a problem worth exploring. In addition, how to further improve the accuracy of sentiment polarity prediction is also a work to be studied. To solve the above problems, we propose a multimodal sentiment analysis model with effective context semantic modality fusion and sentiment polarity correction (CSMF-SPC). Firstly, we design a low-rank multimodal fusion network based on context semantic modality (CSM-LRMFN). CSM-LRMFN uses the bi-directional long short-term memory network to extract the context semantic features of non-text modalities, and the BERT to extract the features of text modality. Then, CSM-LRMFN adopts a low-rank multimodal fusion method to fully extract the interaction information among modalities with contextual semantics. Different from previous studies, to improve the accuracy of sentiment polarity prediction, we design a weight self-adjusting sentiment polarity penalty loss function, which makes the model learn more sentiment features that are conducive to model prediction through backpropagation. Finally, a series of comparative experiments are conducted on the CMU-MOSI and CMU-MOSEI datasets. Compared with the current representative models, CSMF-SPC achieves better experimental results. Among them, the Acc-2 (including zero) metric is increased by 1.41% and 1.58% on the word-aligned and unaligned CMU-MOSI datasets respectively; it is improved by 1.50% and 2.14% respectively on the CMU-MOSEI dataset, which indicates that the improvement of CSMF-SPC is effective.