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Develop cod of the cosine similarity for vector space model

I need to develop code to apply the cosine similarity for vector space model (find the attached). In fact, I have already that code by SQL [url removed, login to view], this code ONLY receives or apply One [url removed, login to view] example, when user searches ( food), my code can work perfectly and provide valid [url removed, login to view] when user searches ( food and car in-house ) my code could not apply the cosine similarity [url removed, login to view] I would like code to apply the cosine similarity whether one word or multiple words.

Note:

-The code should be sql command or c#.

-The speed factor for retrieving the results and ranking is significant because my search engine deals with massive data.

Skills: C Programming, C# Programming, C++ Programming, MySQL, SQL

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