  Understanding relations between objects is crucial for understanding the
semantics of a visual scene. It is also an essential step in order to bridge
visual and language models. However, current state-of-the-art computer vision
models still lack the ability to perform spatial reasoning well. Existing
datasets mostly cover a relatively small number of spatial relations, all of
which are static relations that do not intrinsically involve motion. In this
paper, we propose the Spatial and Temporal Understanding of Prepositions
Dataset (STUPD) -- a large-scale video dataset for understanding static and
dynamic spatial relationships derived from prepositions of the English
language. The dataset contains 150K visual depictions (videos and images),
consisting of 30 distinct spatial prepositional senses, in the form of object
interaction simulations generated synthetically using Unity3D. In addition to
spatial relations, we also propose 50K visual depictions across 10 temporal
relations, consisting of videos depicting event/time-point interactions. To our
knowledge, no dataset exists that represents temporal relations through visual
settings. In this dataset, we also provide 3D information about object
interactions such as frame-wise coordinates, and descriptions of the objects
used. The goal of this synthetic dataset is to help models perform better in
visual relationship detection in real-world settings. We demonstrate an
increase in the performance of various models over 2 real-world datasets
(ImageNet-VidVRD and Spatial Senses) when pretrained on the STUPD dataset, in
comparison to other pretraining datasets.
