code: def _raveled_index_for(self, param):
          
          from ..param import ParamConcatenation
          if isinstance(param, ParamConcatenation):
              return np.hstack((self._raveled_index_for(p) for p in param.params))
          return param._raveled_index() + self._offset_for(param)
docs: get the raveled index for a param
          that is an int array, containing the indexes for the flattened
          param inside this parameterized logic.
  
          !Warning! be sure to call this method on the highest parent of a hierarchy,
          as it uses the fixes to do its work