code: def __iter__(self):
      while self._tileable_handlers:
          to_update_tileables = self._iter()
          yield self._cur_chunk_graph
          for t in to_update_tileables:
              t.refresh_params()
  
imports: import dataclasses
  import functools
  from typing import Callable, Dict, Generator, Iterable, List, Optional, Set, Type, Union
  from ....core import FUSE_CHUNK_TYPE, CHUNK_TYPE, TILEABLE_TYPE
  from ....typing import EntityType, TileableType, ChunkType
  from ....utils import copy_tileables, build_fetch
  from ...entity.tileables import handler
  from ...mode import enter_mode
  from ..entity import TileableGraph, ChunkGraph
  from .base import AbstractGraphBuilder
label_desc: Use image node_id 9 for calling the Tiler obj's underlying member method code with example usage: obj.__iter__() without return types