Self-supervised Pre-training and Contrastive Representation Learning for Multiple-choice Video QA

Authors

  • Seonhoon Kim Seoul National University Naver Search
  • Seohyeong Jeong Seoul National University
  • Eunbyul Kim Naver Search
  • Inho Kang Naver Search
  • Nojun Kwak Seoul National University

Keywords:

Language Grounding & Multi-modal NLP

Abstract

Video Question Answering (VideoQA) requires fine-grained understanding of both video and language modalities to answer the given questions. In this paper, we propose novel training schemes for multiple-choice video question answering with a self-supervised pre-training stage and a supervised contrastive learning in the main stage as an auxiliary learning. In the self-supervised pre-training stage, we transform the original problem format of predicting the correct answer into the one that predicts the relevant question to provide a model with broader contextual inputs without any further dataset or annotation. For contrastive learning in the main stage, we add a masking noise to the input corresponding to the ground-truth answer, and consider the original input of the ground-truth answer as a positive sample, while treating the rest as negative samples. By mapping the positive sample closer to the masked input, we show that the model performance is improved. We further employ locally aligned attention to focus more effectively on the video frames that are particularly relevant to the given corresponding subtitle sentences. We evaluate our proposed model on highly competitive benchmark datasets related to multiple-choice video QA: TVQA, TVQA+, and DramaQA. Experimental results show that our model achieves state-of-the-art performance on all datasets. We also validate our approaches through further analyses.

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Published

2021-05-18

How to Cite

Kim, S., Jeong, S., Kim, E., Kang, I., & Kwak, N. (2021). Self-supervised Pre-training and Contrastive Representation Learning for Multiple-choice Video QA. Proceedings of the AAAI Conference on Artificial Intelligence, 35(14), 13171-13179. Retrieved from https://ojs.aaai.org/index.php/AAAI/article/view/17556

Issue

Section

AAAI Technical Track on Speech and Natural Language Processing I