code: def run_main():
    
    program.setup_environment()
  
    if getattr(tf, '__version__', 'stub') == 'stub':
      print("TensorFlow installation not found - running with reduced feature set.",
            file=sys.stderr)
  
    tensorboard = program.TensorBoard(default.get_plugins(),
                                      program.get_default_assets_zip_provider())
    try:
      from absl import app
      # Import this to check that app.run() will accept the flags_parser argument.
      from absl.flags import argparse_flags
      app.run(tensorboard.main, flags_parser=tensorboard.configure)
      raise AssertionError("absl.app.run() shouldn't return")
    except ImportError:
      pass
    except base_plugin.FlagsError as e:
      print("Error: %s" % e, file=sys.stderr)
      sys.exit(1)
  
    tensorboard.configure(sys.argv)
    sys.exit(tensorboard.main())
docs: Initializes flags and calls main().