A Multi-modal System for Video Semantic Understanding

This paper proposes a video semantic understanding system based on multi-modal data fusion. The system includes two sub-models, the video classification tag model (VCT) and the video semantic tagmodel (VST), to generate classification tags and semantic tags for videos respectively. The VCT model uses bidirectional LSTM model and Attention mechanism to integrate the video features, which can effectively improve the model result than other methods. The VST model directly extracts semantic tags from text data with the combined model of ROBERTA and CRF. We implemented the system in the CCKS 2021 Task 14 and achieved an F1 score of 0.5054, ranking second among 187 teams.