code: def _build(self) -> Union[TileableGraph, ChunkGraph]:
      self._add_nodes(
          self._graph, list(self._graph.result_tileables), set()
      )
      return self._graph
  
file_path: mars/mars/core/graph/builder/tileable.py
imports: from typing import Union, Generator
  from ...mode import enter_mode
  from ..entity import TileableGraph, ChunkGraph
  from .base import AbstractGraphBuilder
label_desc: Use image node_id 2 for calling the TileableGraphBuilder obj's underlying member method code with example usage: obj._build() and returns: self