code: def load(self, filename, file_format=None):
          
          loader = self._get_loader(filename, file_format=file_format)
          loader(filename)
docs: Load saved (pickled or dx) grid and edges from <filename>.pickle
  
             Grid.load(<filename>.pickle)
             Grid.load(<filename>.dx)
  
          The load() method calls the class's constructor method and
          completely resets all values, based on the loaded data.