ConceptNet

Introduced by Speer et al. in ConceptNet 5.5: An Open Multilingual Graph of General Knowledge

ConceptNet is a knowledge graph that connects words and phrases of natural language with labeled edges. Its knowledge is collected from many sources that include expert-created resources, crowd-sourcing, and games with a purpose. It is designed to represent the general knowledge involved in understanding language, improving natural language applications by allowing the application to better understand the meanings behind the words people use.

Source: ConceptNet 5.5: An Open Multilingual Graph of General Knowledge

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