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(A), Locations of the NASs that share the same topic in the LDA model. Two topics are shown for each action in the KTH dataset. (B), Number of NASs share the same topic of the LDA models of the six actions in the KTH dataset. The insets show the numbers of NASs of the selected topics that are shared by the 1–6 actions in the dataset. Note that, by definition, topics are not shared by two or more actions.
