Glossary term
Glossary term
Foundations
The starting node (the first condition) in a decision tree. By convention, diagrams put the root at the top of the decision tree. For example:

Created for this library
A research engineer inspects the root of a decision tree to understand the first split chosen by the learner.
A risk team logs the root split of its production decision tree to document the most impactful feature in audits.
A churn modeling team reviews the root of the segmentation tree each release so the top-level rule remains aligned with business intent.
Definition source: Google for Developers Machine Learning Glossary | Creative Commons Attribution 4.0 License