HCMUS at MediaEval 2021: Efficient methods of Metadata Embedding and Augmentation for Visual Sentiment Analysis. - Bang-Dang Pham; Nhat-Tan Bui; Minh-Khoi Pham; Pham Van Ngoan; Truong-Hai Nguyen; Thang-Long Nguyen-Ho; Hai-Dang Nguyen; Minh-Triet Tran (MediaEval, 2021)