A Robust Continuous Authentication System Using Smartphone Sensors and Wasserstein Generative Adversarial Networks

Table 4

Mean EER (%) on different user activities for different classifiers.

Activities	RF	OCSVM	KNN	DT
Sitting + reading	4.32	5.52	6.52	5.52
Sitting + writing	9.87	3.87	4.99	4.43
Sitting + map	6.77	6.39	6.64	6.93
Walking + reading	9.78	4.58	10.52	13.06
Walking + writing	10.78	5.14	11.52	9.49
Walking + map	7.10	6.36	13.38	10.48

Our proposed method has the smallest mean ERR of 3.87% on the OCSVM classifier. The mean EER of the RF classifier on sitting + reading and walking + map is 4.32% and 7.1%, respectively, and the mean EER of the OCSVM classifier on sitting+map, walking + reading, and walking + writing is 6.39%, 4.58%, and 5.14%, respectively.