An Algorithm and a Tool for the Automatic Grading of MOOC Learners from Their Contributions in the Discussion Forum. - García-Molina, Sergio; Alario-Hoyos, Carlos; Moreno-Marcos, Pedro Manuel; Muñoz-Merino, Pedro J.; Estévez-Ayres, Iria; Delgado Kloos, Carlos (Applied Sciences (2076-3417), 2021)