Although this isn't exactly the same as recognizing your coworker Mary on the street, the feat is still impressive. The 13,000-photo dataset in which the algorithms were tested is considered a standard benchmark in computer vision, the Physics arXiv Blog reports. Plus, the task is not unlike real life applications. For example, if law enforcement wanted to identify a face in a security camera snapshot, they would run a program that tries to match their suspect's snapshot with their database of mugshots. The program would probably run through different possible comparisons, asking, just as the Hong Kong algorithm does, "Does Mugshot A match Snapshot X?"