MACHINE LEARNING FOR CLASSIFICATION OF USERS

A method or a system for classifying users into a plurality of categories. The system uses a first machine learning (ML) model to segment users into a first plurality of groups based in part on a first set of features, indicating relative research-skill levels of the respective users. The system uses a second ML model to segment users into a second plurality of groups based in part on a second set of features, indicating relative engagement levels of the respective users. The system then uses a third ML model to classify the plurality of users into a plurality of classes based in part on the research-skill levels and the engagement levels of the respective users, and selects and presents content to the user based in part on their classifications.