docs: def load(self, filename, **kwargs):
          """
          Parse a file specified with the filename and return an numpy array
  
          Parameters
          ----------
              filename : string
                  A path of a file
  
          Returns
          -------
          ndarray
              An instance of numpy array
  
          """
          with open(filename, 'r') as f:
              return self.parse(f, **kwargs)