From entry hybrid architecture in glossary Artificial Intelligence: humans at the heart of algorithms
An hybrid architecture is one where different modules or layers use different kinds of AI technolgies. For example, we might use a random forest to perform low-level classification (say of human activity in a care setting), and then use these classes in a hand-crafted rule-based system (say "if suspected fall, alert warden").
Used in Chap. 1: page 3