Computer Vision and NLP based Multimodal Ensemble Attentiveness Detection API for E-Learning. - Manesha Dimanthi Wijeratne; Ranepura Hewage Gayan Asanka Lakmal; Weerasinghe Kulathunga Shashikala Geethadhari; Manula Akbo Athalage; Anjalie Gamage; Dharshana Kasthurirathna (EDUCON, 2021)