The task of person re-identification is to identify a person of interest at another time or place. This is done by extracting the image feature and comparing the features. Images of same identity ought to have similar features and get small feature distance, while images of different identities have large feature distance. With a queried image and a pile of candidate images given, the image that has the smallest distance is identified as the same person as the queried image. The following table shows the ReID detection model supported by the AI Library.