What is the difference between closed-domain and open-domain question answering?
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A
Closed-domain QA is restricted to a specific topic or dataset, while open-domain QA answers questions about any topic using a large corpus or the web
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B
Closed-domain QA uses neural networks while open-domain QA uses rules
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C
Open-domain QA requires a knowledge graph while closed-domain does not
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D
Closed-domain QA generates answers while open-domain extracts spans