code: def resolve_operation(
      self, operation_to_node: Dict[Operation, List[Node]]
  ):
      entries = operation_to_node[self.ref_operation]
      if not entries:
          raise ValueError(
              f"{self.ref_operation} not found in other pipelines"
          )
      if len(entries) > 1:
          raise ValueError(
              f"Reference to {self.ref_operation} ambiguous"
          )
  
      self._parent = entries[0]
  
imports: from distutils.log import warn
  import warnings
  import ast
  from collections import defaultdict
  from typing import Callable, Dict, List, Optional, Sequence, Set
  from abc import ABC, abstractmethod
  from ffcv.pipeline.allocation_query import AllocationQuery
  from ffcv.pipeline.pipeline_spec import PipelineSpec
  from ffcv.pipeline.compiler import Compiler
  from ffcv.pipeline.allocation_query import allocate_query
  from .operation import Operation
  from ..transforms import ModuleWrapper
  from .state import State
  import torch
  import numpy
label_desc: Use image node_id 2 for calling the RefNode obj's underlying member method code with example usage: obj.resolve_operation(operation_to_node) without return types