Online Rare Category Detection for Edge Computing
Yufei Cui1, Qiao Li1,a, Sarana Nutanong2 and Chun Jason Xue1
1City University of Hong Kong, Hong Kong, China
aqiaoli045@gmail.com
2School of Information Science and Technology, VISTEC, Thailand
ABSTRACT
Identifying rare categories is an important data management problem in many application fields including video surveillance, ecological environment monitoring and precision medicine. Previous solutions in literature require all data instances to be first delivered to the server. Then, the rare categories identification algorithms are executed on the pool of data to find informative instances for human annotators to label. This incurs large bandwidth consumption and high latency. To deal with the problems, we propose a light-weight rare categories identification framework. At the sensor side, the designed online algorithm filters less informative data instances from the data stream and only sends the informative ones to human annotators. After labeling, the server only sends labels of the corresponding data instances in response. The sensor-side algorithm is extended to enable cooperation between embedded devices for the cases that data is collected in a distributed manner. Experiments are conducted to show our framework dramatically outperforms the baseline. The network traffic is reduced by 75% on average.
Keywords: Rare category detection, Machine learning, Realtime system, Edge computing.
