“…Recently, deep learning models were also used to recognize emotions, such as bi-level convolutional neural networks for fine-grained emotion recognition using Russell's dimensional emotion model (Zhou, Kong, et al, 2020). By recognizing and monitoring users' emotions, the system can respond to the users to improve learning in education (Wu, Huang, & Hwang, 2016), communications for autistic children (Messinger et al, 2015), and video gaming (Guthier, Dörner, & Martinez, 2016), to name but a few.…”