code: def _reload_airflow_dags(self):
      # Created pipelines can be registered to the DB by airflow scheduler
      # asynchronously. But we will rely on `initdb` which does same job
      # synchronously for deterministic and fast test execution.
      # (And it doesn't initialize db.)
      self._airflow_initdb()
  
imports: import codecs
  import locale
  import os
  import subprocess
  import sys
  import time
  import absl
  from click import testing
  import tensorflow
  from tfx.dsl.io import fileio
  from tfx.orchestration.airflow import test_utils
  from tfx.tools.cli import labels
  from tfx.tools.cli import pip_utils
  from tfx.tools.cli.cli_main import cli_group
  from tfx.tools.cli.e2e import test_utils
  from tfx.utils import io_utils
  from tfx.utils import retry
  from tfx.utils import test_case_utils
label_desc: Use image node_id 4 for calling the CliAirflowEndToEndTest obj's underlying member method code with example usage: obj._reload_airflow_dags() without return types