Abstract
Knowledge tracing (KT) aims to predict student performance on the next question according to historical records. Recently deep learning-based models for KT task successfully modeling student responses receive good prediction results of student performance. The student responses encoded as input of KT models use a one-hot encoding. We find that one-hot encoding represents student responses on different items related to the same concepts in completely different vectors. However, items related to the same concept have certain relationships in the real world so the student has a similar representation in these items. In this paper, we propose a new method named Contrastive Deep Knowledge Tracing (CDKT) for providing a reasonable representation of students. We evaluate our model using three public benchmark datasets and the experimental results demonstrate improvements over state-of-the-art methods.
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Acknowledgement
This study was funded in part by National Natural Science Foundation of China (61802313, U1811262, 61772426), Key Research and Development Program of China (2020AAA0108500), Reformation Research on Education and Teaching at Northwestern Polytechnical University (2021JGY31), Education And Teaching Reform Research Project of Northwestern Polytechnical University (2022JGY62).
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Dai, H., Yun, Y., Zhang, Y., Zhang, W., Shang, X. (2022). Contrastive Deep Knowledge Tracing. In: Rodrigo, M.M., Matsuda, N., Cristea, A.I., Dimitrova, V. (eds) Artificial Intelligence in Education. Posters and Late Breaking Results, Workshops and Tutorials, Industry and Innovation Tracks, Practitioners’ and Doctoral Consortium. AIED 2022. Lecture Notes in Computer Science, vol 13356. Springer, Cham. https://doi.org/10.1007/978-3-031-11647-6_54
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