The dataset contains 400 human action classes, with at least 400 video clips for each action. Each clip lasts around 10s and is taken from a different YouTube video. The actions are human focussed and cover a broad range of classes including human-object interactions such as playing instruments, as well as human-human interactions such as shaking hands.
Source: https://arxiv.org/abs/1705.06950
Image source: https://arxiv.org/abs/1705.06950
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