We address the problem of video moment localization with natural language, i.e. localizing a video segment described by a natural language sentence. While most prior work focuses on grounding the query as a whole, temporal dependencies and reasoning between events within the text are not fully considered. In this paper, we propose a novel Temporal Compositional Modular Network (TCMN) where a tree attention network first automatically decomposes a sentence into three descriptions with respect to the main event, context event and temporal signal. Two modules are then utilized to measure the visual similarity and location similarity between each segment and the decomposed descriptions. Moreover, since the main event and context event may rely on different modalities (RGB or optical flow), we use late fusion to form an ensemble of four models, where each model is independently trained by one combination of the visual input. Experiments show that our model outperforms the state-of-the-art methods on the TEMPO dataset.

本论文提出了 Temporal Compositional Modular Network (TCMN) 模型，该模型结合自然语言描述和视觉信息，通过树形注意力网络自动细分为描述主事件、情境事件和时间信号三部分，再使用两个模块计量视频片段与细分描述间的相似度和位置相似度，通过 late fusion 方法组合 RGB 和光流两种数据进行训练，实验证明此模型在 TEMPO 数据集上表现优于现有方法。

利用自然语言在视频时序关系中进行时刻定位