Never-Ending Language Learner
CMU knowledge base that continuously learns facts from the web using semi-supervised ML. Auto-extracts structured knowledge.
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Where this one tends to earn its keep.
Information extraction research
Semi-supervised learning experiments
Web-scale knowledge base population
Continual learning system benchmarks
I haven't checked this label against the actual licence text — it's the catalogue's original guess. Check the ontology's own site before you rely on it.
Others worth a look in Knowledge Graphs.