def testDontOverwriteEmptyLabelMapPath(self):
    """Tests that label map path will not by overwritten with empty string."""
    original_label_map_path = "path/to/original/label_map"
    new_label_map_path = ""
    pipeline_config_path = os.path.join(self.get_temp_dir(), "pipeline.config")

    pipeline_config = pipeline_pb2.TrainEvalPipelineConfig()
    train_input_reader = pipeline_config.train_input_reader
    train_input_reader.label_map_path = original_label_map_path
    eval_input_reader = pipeline_config.eval_input_reader.add()
    eval_input_reader.label_map_path = original_label_map_path
    _write_config(pipeline_config, pipeline_config_path)

    configs = config_util.get_configs_from_pipeline_file(pipeline_config_path)
    override_dict = {"label_map_path": new_label_map_path}
    configs = config_util.merge_external_params_with_configs(
        configs, kwargs_dict=override_dict)
    self.assertEqual(original_label_map_path,
                     configs["train_input_config"].label_map_path)
    self.assertEqual(original_label_map_path,
                     configs["eval_input_configs"][0].label_map_path)
Tests that label map path will not by overwritten with empty string.
inference_api/src/main/object_detection/utils/config_util_test.py