Constrained Generalized Additive 2 Model with Consideration of High-Order Interactions

• URL: http://arxiv.org/abs/2106.02836v1
• Date: Sat, 5 Jun 2021 08:31:20 GMT
• Title: Constrained Generalized Additive 2 Model with Consideration of High-Order Interactions
• Authors: Akihisa Watanabe, Michiya Kuramata, Kaito Majima, Haruka Kiyohara, Kensho Kondo, Kazuhide Nakata
• Abstract summary: We propose CGA2M+, which is based on the Generalized Additive 2 Model (GA2M) In this study, we propose CGA2M+, which is based on the Generalized Additive 2 Model (GA2M)
• Score: 0.39146761527401425
• License: http://creativecommons.org/licenses/by/4.0/
• Abstract: In recent years, machine learning and AI have been introduced in many industrial fields. In fields such as finance, medicine, and autonomous driving, where the inference results of a model may have serious consequences, high interpretability as well as prediction accuracy is required. In this study, we propose CGA2M+, which is based on the Generalized Additive 2 Model (GA2M) and differs from it in two major ways. The first is the introduction of monotonicity. Imposing monotonicity on some functions based on an analyst's knowledge is expected to improve not only interpretability but also generalization performance. The second is the introduction of a higher-order term: given that GA2M considers only second-order interactions, we aim to balance interpretability and prediction accuracy by introducing a higher-order term that can capture higher-order interactions. In this way, we can improve prediction performance without compromising interpretability by applying learning innovation. Numerical experiments showed that the proposed model has high predictive performance and interpretability. Furthermore, we confirmed that generalization performance is improved by introducing monotonicity.

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