As a collection of various IoT devices, smart classroom can record various forms of teaching data and provide rich data for recognizing teachers' emotions. Recognizing and analyzing teachers' emotions can promote teachers' professional development. Nowadays, most of the automatic emotion recognition methods for teachers in smart classroom are based on facial expressions. However, since teachers usually keep smiling to mobilize the classroom atmosphere, the recognition results may not reflect the real mental state of teachers. By observing teach...
