Robot dog SPOT which can detect whether visitors wear masks or not is seen during its second round trials in Singapore's Bishan Park, as part of measures against the spread of COVID-19, on Sept. 22, 2020. Besides maintaining safe social distancing, SPOT has increased capabilities like mask detection and 3D mapping without lidar during the second round trials. (Photo by Then Chih Wey/Xinhua)

Robot dog SPOT which can detect whether visitors wear masks or not is seen during its second round trials in Singapore's Bishan Park, as part of measures against the spread of COVID-19, on Sept. 22, 2020. Besides maintaining safe social distancing, SPOT has increased capabilities like mask detection and 3D mapping without lidar during the second round trials. (Photo by Then Chih Wey/Xinhua)

Robot dog SPOT which can detect whether visitors wear masks or not is seen during its second round trials in Singapore's Bishan Park, as part of measures against the spread of COVID-19, on Sept. 22, 2020. Besides maintaining safe social distancing, SPOT has increased capabilities like mask detection and 3D mapping without lidar during the second round trials. (Photo by Then Chih Wey/Xinhua)

Robot dog SPOT which can detect whether visitors wear masks or not is seen during its second round trials in Singapore's Bishan Park, as part of measures against the spread of COVID-19, on Sept. 22, 2020. Besides maintaining safe social distancing, SPOT has increased capabilities like mask detection and 3D mapping without lidar during the second round trials. (Photo by Then Chih Wey/Xinhua)

Robot dog SPOT which can detect whether visitors wear masks or not is seen during its second round trials in Singapore's Bishan Park, as part of measures against the spread of COVID-19, on Sept. 22, 2020. Besides maintaining safe social distancing, SPOT has increased capabilities like mask detection and 3D mapping without lidar during the second round trials. (Photo by Then Chih Wey/Xinhua)

Robot dog SPOT which can detect whether visitors wear masks or not is seen during its second round trials in Singapore's Bishan Park, as part of measures against the spread of COVID-19, on Sept. 22, 2020. Besides maintaining safe social distancing, SPOT has increased capabilities like mask detection and 3D mapping without lidar during the second round trials. (Photo by Then Chih Wey/Xinhua)

Robot dog SPOT which can detect whether visitors wear masks or not is seen during its second round trials in Singapore's Bishan Park, as part of measures against the spread of COVID-19, on Sept. 22, 2020. Besides maintaining safe social distancing, SPOT has increased capabilities like mask detection and 3D mapping without lidar during the second round trials. (Photo by Then Chih Wey/Xinhua)