code: def cumulative_density_at_times(self, times, label=None):
          
          label = coalesce(label, self._label)
          return pd.Series(1 - self.predict(times), index=_to_array(times), name=label)
docs: Return a Pandas series of the predicted cumulative density at specific times
  
          Parameters
          -----------
          times: iterable or float
  
          Returns
          --------
          pd.Series