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

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Text this: Extracting key-substring-group features for text classification