This task is inherently discriminative, i.e., there is only a single most relevant clip pertaining to Figure 1: Clip Extraction task for the given query 'the biker jumps to another ramp near the camera' a given query in the corresponding video.
most prior works (Hendricks et al., 2017(Hendricks et al., , 2018Chen et al., 2018;) explore this as a ranking task over a fixed number of moments by uniformly sampling clips within a video.