class_docstr: Assign start nodes.
code: def _is_gpu_band(self) -> bool:
      gpu_ops = (
          [op for op in self._start_ops if not isinstance(op, Fetch)]
          if self._start_ops
          else []
      )
      if gpu_ops and all(op.gpu for op in gpu_ops):
          return True
      return False
  
imports: from abc import ABC, abstractmethod
  from collections import defaultdict
  from operator import itemgetter
  from typing import List, Dict, Union
  import numpy
  from ....core import ChunkGraph, ChunkData
  from ....core.operand import Operand, Fetch
  from ....lib.ordered_set import OrderedSet
  from ....resource import Resource
  from ....typing import BandType
  from ....utils import implements
label_desc: Use image node_id 3 for calling the AbstractGraphAssigner obj's underlying member method code with example usage: obj._is_gpu_band() and returns: False, True