code: def testImplicitChannelKey(self):
      model = types.Channel(
          type=standard_artifacts.Model,
          producer_component_id="trainer",
          output_key="model",
      )
      self.assertEqual(
          "_trainer.model", compiler_utils.implicit_channel_key(model)
      )
  
      external_pipeline_channel = external_pipeline_artifact_query(
          artifact_type=standard_artifacts.Model,
          owner="owner",
          pipeline_name="pipeline_name",
          producer_component_id="trainer",
          output_key="model",
      )
      self.assertEqual(
          "_trainer.model.owner.pipeline_name",
          compiler_utils.implicit_channel_key(
              external_pipeline_channel
          ),
      )
  
imports: import itertools
  import tensorflow
  from tfx import types
  from tfx.components import CsvExampleGen
  from tfx.components import StatisticsGen
  from tfx.dsl.compiler import compiler_utils
  from tfx.dsl.components.base import base_component
  from tfx.dsl.components.base import base_executor
  from tfx.dsl.components.base import executor_spec
  from tfx.dsl.components.common import importer
  from tfx.dsl.components.common import resolver
  from tfx.dsl.input_resolution.strategies import latest_blessed_model_strategy
  from tfx.dsl.placeholder import placeholder
  from tfx.orchestration import pipeline
  from tfx.proto.orchestration import pipeline_pb2
  from tfx.types import standard_artifacts
  from tfx.types.artifact import Artifact
  from tfx.types.artifact import Property
  from tfx.types.artifact import PropertyType
  from tfx.types.channel import Channel
  from tfx.types.channel import OutputChannel
  from tfx.types.channel_utils import external_pipeline_artifact_query
  from google.protobuf import text_format
  from ml_metadata.proto import metadata_store_pb2
label_desc: Use image node_id 10 for calling the CompilerUtilsTest obj's underlying member method code with example usage: obj.testImplicitChannelKey() without return types