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I know it's a keyword based search. But sites like Quora have some good suggesting algorithms where the algorithm understands the intent of question asked rather than just the keywords meanings.

For instance, for a question involving "O(n^2)" it adds 'Algorithms' and 'Computer Science' as topics and for a question involving "limit on friends in Facebook" it adds 'Facebook friends' as a topic. So it's more of a semantic search.

Google search also works on the same principles of semantic search. So how exactly does tag suggestion algorithm work?

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    $\begingroup$ Can you make your question self contained by explaining what is topic suggestion algorithm.. $\endgroup$
    – Navjot Singh
    Commented Aug 28, 2018 at 8:15

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Read about topic modeling in natural language processing. There are many techniques; e.g., LDA is one simple standard approach.

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