Cyc


Its researchers have produced a corpus of 1.5 million concepts and 25 million rules that feed an inference engine with more than a thousand specialized submodules. The system can use both common-sense knowledge and deep domain expertise to make deductions from chains of reasonings that are thousands of steps long. 

Its users range from an Ohio research hospital to the National Security Agency.

Yet despite its impressive achievements, Cyc has been largely forgotten, left behind by a new generation of machine-learning algorithms that power the chatbots and self-driving cars of today. 

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