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  ______   _    _     _____    _    _     _____   
 /_   _// | || | ||  /  ___|| | || | ||  / ____|| 
 `-| |,-  | || | || | // __   | || | || / //---`' 
   | ||   | \\_/ || | \\_\ || | \\_/ || \ \\___   
   |_||    \____//   \____//   \____//   \_____|| 
   `-`'     `---`     `---`     `---`     `----`

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Text this: Summarizing user-item matrix by group utility maximization