Monotonic Neural Additive Models: Pursuing Regulated Machine Learning Models for Credit Scoring
This addresses the need for regulated, explainable models in credit scoring, offering a practical solution that balances accuracy with compliance, though it is incremental in improving existing neural additive models.
The paper tackles the problem of developing machine learning models for credit scoring that meet regulatory requirements like transparency and fairness while maintaining high accuracy, introducing monotonic neural additive models that achieve accuracy comparable to black-box neural networks.
The forecasting of credit default risk has been an active research field for several decades. Historically, logistic regression has been used as a major tool due to its compliance with regulatory requirements: transparency, explainability, and fairness. In recent years, researchers have increasingly used complex and advanced machine learning methods to improve prediction accuracy. Even though a machine learning method could potentially improve the model accuracy, it complicates simple logistic regression, deteriorates explainability, and often violates fairness. In the absence of compliance with regulatory requirements, even highly accurate machine learning methods are unlikely to be accepted by companies for credit scoring. In this paper, we introduce a novel class of monotonic neural additive models, which meet regulatory requirements by simplifying neural network architecture and enforcing monotonicity. By utilizing the special architectural features of the neural additive model, the monotonic neural additive model penalizes monotonicity violations effectively. Consequently, the computational cost of training a monotonic neural additive model is similar to that of training a neural additive model, as a free lunch. We demonstrate through empirical results that our new model is as accurate as black-box fully-connected neural networks, providing a highly accurate and regulated machine learning method.