arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 2005.06139cs.LGcs.AI
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面向知识追踪的可解释深度学习模型

Towards Interpretable Deep Learning Models for Knowledge Tracing

Advanced Innovation Center for Future Education(未来教育高精尖创新中心);School of Educational Technology, Beijing Normal University(北京师范大学教育技术学院)

Yu Lu, Deliang Wang, Qinggang Meng, Penghe Chen

摘要:

传统的知识追踪模型作为学习者知识状态建模的重要技术,已被广泛应用于智能教学系统和MOOC平台。在深度学习技术快速发展的推动下,深度神经网络最近已被用于设计新的KT模型以实现更好的预测性能。然而,这些模型的可解释性的缺乏痛苦地阻碍了它们的实际应用,因为它们的输出和工作机制受到不透明的决策过程和复杂的内部结构的影响。因此,我们建议采用事后方法来解决基于深度学习的知识跟踪(DLKT)模型的可解释性问题。具体来说,我们专注于应用逐层相关传播(LRP)方法来解释基于RNN的DLKT模型,通过将相关性从模型的输出层反向传播到输入层。实验结果表明,使用LRP方法解释DLKT模型的预测的可行性,并部分验证了计算的相关性得分从问题层面和概念层面。我们相信,这将是充分解释DLKT模型并促进其在教育领域实际应用的坚实一步。

英文摘要:

As an important technique for modeling the knowledge states of learners, the traditional knowledge tracing (KT) models have been widely used to support intelligent tutoring systems and MOOC platforms. Driven by the fast advancements of deep learning techniques, deep neural network has been recently adopted to design new KT models for achieving better prediction performance. However, the lack of interpretability of these models has painfully impeded their practical applications, as their outputs and working mechanisms suffer from the intransparent decision process and complex inner structures. We thus propose to adopt the post-hoc method to tackle the interpretability issue for deep learning based knowledge tracing (DLKT) models. Specifically, we focus on applying the layer-wise relevance propagation (LRP) method to interpret RNN-based DLKT model by backpropagating the relevance from the model's output layer to its input layer. The experiment results show the feasibility using the LRP method for interpreting the DLKT model's predictions, and partially validate the computed relevance scores from both question level and concept level. We believe it can be a solid step towards fully interpreting the DLKT models and promote their practical applications in the education domain.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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