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license: cc-by-4.0
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A collection of large-scale, high-quality datasets of URL links of up to 650,000 video clips that cover 400 human action classes. 
The videos include human-object interactions such as playing instruments, as well as human-human interactions such as shaking hands and hugging. 
Each action class has at least 400. 
Each clip is human annotated with a single action class and lasts around 10 seconds.

Originally created by Google Inc. and the dataset has been uploaded as is without any changes.