code: def __get_initial_center(self, return_index):
          
  
          index_center = random.randint(0, len(self.__data) - 1)
          if return_index:
              return index_center
  
          return self.__data[index_center]
docs: !
          @brief Choose randomly first center.
  
          @param[in] return_index (bool): If True then return center's index instead of point.
  
          @return (array_like) First center.<br>
                  (uint) Index of first center.