If the reader wants to know the details of DKT+, please refer to the Appendix of the paper: Addressing Two Problems in Deep Knowledge Tracing via Prediction-Consistent Regularization.
@inproceedings{yeung2018addressing,
title={Addressing two problems in deep knowledge tracing via prediction-consistent regularization},
author={Yeung, Chun-Kit and Yeung, Dit-Yan},
booktitle={Proceedings of the Fifth Annual ACM Conference on Learning at Scale},
pages={1--10},
year={2018}
}