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Solve the following problem using Python, implementing the functions described below, one line at a time
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Description:
 def validate_config(config):
 """ Validates the extractor configuration file. Ensures that there are no duplicate field names, etc. :param config: The configuration file that contains the specification of the extractor :return: True if config is valid, else raises a exception that specifies the correction to be made """

    fields = [f for f in get_fields(config)]
    if len(fields) != len(set(fields)):
        raise InvalidConfigException(
            "Invalid configuration file - %d duplicate field names" % len(fields) - len(set(fields))
        )
    return True