ScaleVLAD: Improving Multimodal Sentiment Analysis via Multi-Scale Fusion of Locally Descriptors
This work addresses the challenge of aligning different modalities at varying granularities for researchers in multimodal sentiment analysis, representing an incremental improvement over existing attention-based fusion methods.
The paper tackled the problem of suboptimal single-scale fusion in multimodal sentiment analysis by proposing ScaleVLAD, which gathers multi-scale representations from text, video, and audio using shared Vectors of Locally Aggregated Descriptors, resulting in significant gains on benchmarks like IEMOCAP, MOSI, and MOSEI.
Fusion technique is a key research topic in multimodal sentiment analysis. The recent attention-based fusion demonstrates advances over simple operation-based fusion. However, these fusion works adopt single-scale, i.e., token-level or utterance-level, unimodal representation. Such single-scale fusion is suboptimal because that different modality should be aligned with different granularities. This paper proposes a fusion model named ScaleVLAD to gather multi-Scale representation from text, video, and audio with shared Vectors of Locally Aggregated Descriptors to improve unaligned multimodal sentiment analysis. These shared vectors can be regarded as shared topics to align different modalities. In addition, we propose a self-supervised shifted clustering loss to keep the fused feature differentiation among samples. The backbones are three Transformer encoders corresponding to three modalities, and the aggregated features generated from the fusion module are feed to a Transformer plus a full connection to finish task predictions. Experiments on three popular sentiment analysis benchmarks, IEMOCAP, MOSI, and MOSEI, demonstrate significant gains over baselines.