Inference engine (Artificial Intelligence) - Definition - Meaning - Lexicon & Encyclopedia

An inference engine is a critical module or program designed to collect information from a database and apply various rules to locate patterns. Once the data is processed, the engine executes actions based on the results derived from these logical operations. This component provides the reasoning ability necessary for expert systems to derive conclusions on which they act. The basic structure of an expert system typically consists of five parts, including a knowledge base, a database, an interpretation part, and a knowledge acquisition module. The inference engine serves as the interpreter that evaluates facts to make decisions, operating on types of logic programs such as forward and backward chaining. Common examples include CLIPS, an open-source tool widely used in development, and Cyc, a large multi-contextual knowledge base developed starting in the early 1980s. Historical development of these systems includes significant milestones such as the work done at Microelectronics and Corporation (MCC) and later at Cycorp, Inc., with key releases noted in Austin, Texas, during the mid-1990s. In modern contexts, researchers tend to focus on lightweight models when deploying on CPUs or mobile devices, though research continues for faster inference capabilities. The engine also simulates human reasoning processes by making fuzzy inference on sets of variables, utilizing defuzzification modules to transform fuzzy sets into crisp values.