Stable Learning Establishes Some Common Ground between Causal Inference and Machine Learning

Causal inference has recently attracted substantial attention in the machine learning and artificial intelligence community. It is usually positioned as a distinct strand of research that can broaden the scope of machine learning from predictive modelling to intervention and decision-making. In this Perspective, however, we argue that ideas from causality can also be used to improve the stronghold of machine learning, predictive modelling, if predictive stability, explainability and fairness are important. With the aim of bridging the gap between the tradition of precise modelling in causal inference and black-box approaches from machine learning, stable learning is proposed and developed as a source of common ground. This Perspective clarifies a source of risk for machine learning models and discusses the benefits of bringing causality into learning. We identify the fundamental problems addressed by stable learning, as well as the latest progress from both causal inference and learning perspectives, and we discuss relationships with explainability and fairness problems.