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

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