code: def __repr__(self):
      if self._repr is not None:
          return self._repr
  
      if self.chunk_graph:
          result_chunk_repr = " ".join(
              [
                  f"{type(chunk.op).__name__}({chunk.key})"
                  for chunk in self.chunk_graph.result_chunks
              ]
          )
      else:  # pragma: no cover
          result_chunk_repr = None
      self._repr = f"<Subtask id={self.subtask_id} results=[{result_chunk_repr}]>"
      return self._repr
  
imports: from enum import Enum
  from typing import Iterable, List, Optional, Set, Tuple
  from ...core import ChunkGraph, DAG, ChunkData
  from ...resource import Resource
  from ...serialization.serializables.field_type import TupleType
  from ...serialization.serializables import Serializable, StringField, ReferenceField, Int32Field, Int64Field, Float64Field, BoolField, AnyField, DictField, ListField, TupleField, FieldTypes
  from ...typing import BandType, ChunkType
label_desc: Use image node_id 5 for calling the Subtask obj's underlying member method code with example usage: obj.__repr__() and returns: self, self