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(A), 6 frequent NASs compiled from each of the 4 actions in the KTH dataset. The locations of the NASs in the videos and the NASs are indicated by the same color. (B), Same format as (A). 6 frequent NASs compiled from each of the 4 actions in the Weizmann dataset. Note that each NAS is a set of patch sequences and also that each NAS shown is the average of all patch sequences that share the same structural indices.
