def METHOD_NAME(spark_conf, gcs_path_raw, gcs_path_transformed):
    """
    entry point. takes spark conf, an input gcs path, and an output gcs path.
    transforms records by adding average speed value.
    """
    ase = AverageSpeedEnhancer()
    file_strings_rdd = spark_conf.textFile(gcs_path_raw)
    # Apply the speed enhancement logic defined in the AverageSpeedEnhancer
    # class. Read the newline delimited json into dicts (note that this is
    # automatically applied per line).
    records_rdd = file_strings_rdd.map(
        lambda record_string: json.loads(record_string))
    transformed_records_rdd = records_rdd.map(ase.enhance_with_avg_speed)
    transformed_records_rdd.saveAsTextFile(gcs_path_transformed)