Diffusion Models for Video Prediction and Infilling : Training a conditional video diffusion model for arbitrary video completion tasks

Sammanfattning: To predict and anticipate future outcomes or reason about missing information in a sequence is a key ability for agents to be able to make intelligent decisions. This requires strong temporally coherent generative capabilities. Diffusion models have shown huge success in several generative tasks lately, but have not been extensively explored in the video domain. We present Random-Mask Video Diffusion (RaMViD), which extends image diffusion models to videos using 3D convolutions, and introduces a new conditioning technique during training. By varying the mask we condition on, the model is able to perform video prediction, infilling and upsampling. Since we do not use concatenation to condition on a mask, as done in most conditionally trained diffusion models, we are able to utilize the same architecture as used for unconditional training which allows us to train the model in a conditional and unconditional fashion at the same time. We evaluated the model on two benchmark datasets for video prediction, on which we achieve state-of-the-art results, and one for video generation.