class_docstr: Dummy channel for testing.
class_docstr_tok: ["Dummy","channel","for","testing","."]
code: def get_data_dependent_node_ids(self) -> Set[str]:
      return set()
  
imports: import typing
  from typing import Callable, Dict, Iterable, Iterator, List, Optional, Sequence, Set, Type, cast
  from tfx.dsl.placeholder import placeholder
  from tfx.proto.orchestration import placeholder_pb2
  from tfx.types import artifact
  from tfx.types import channel
label_desc: Use image node_id 4 for calling the ChannelForTesting obj's underlying member method code with example usage: obj.get_data_dependent_node_ids() and returns: set