(self, node_id)
return self._cur_to_split_node_info[node_id]['is_left_node']
check if it is left node
check if it is left node
check if it is left node
def _is_left(self, node_id):
        """
        check if it is left node
        """
        return self._cur_to_split_node_info[node_id]['is_left_node']
def _is_left ( self , node_id ) : return self . _cur_to_split_node_info [ node_id ] [ 'is_left_node' ]