parameters: (self)
docstring: Gets the representation of the metric object with overridden parameters.
          Implemented in child classes.
  
          Returns
          ----------
          metric_string: str representing the metric object.
docstring_summary: Gets the representation of the metric object with overridden parameters.
          Implemented in child classes.
docstring_tokens: Gets the representation of the metric object with overridden parameters . Implemented in child classes .
function: def __str__(self):
          """
          Gets the representation of the metric object with overridden parameters.
          Implemented in child classes.
  
          Returns
          ----------
          metric_string: str representing the metric object.
          """
          raise NotImplementedError('Should be overridden by the child class.')
function_tokens: def __str__ ( self ) : raise NotImplementedError ( 'Should be overridden by the child class.' )