docs: def command_line_arguments(command_line_parameters):
    """Defines the command line parameters that are accepted."""
  
    # create parser
    parser = argparse.ArgumentParser(description='Execute baseline algorithms with default parameters', formatter_class=argparse.ArgumentDefaultsHelpFormatter)
  
    # add parameters
    # - the algorithm to execute
    parser.add_argument('-a', '--algorithms', choices = all_algorithms, default = ('gmm-voxforge',), nargs = '+', help = 'Select one (or more) algorithms that you want to execute.')
    parser.add_argument('--all', action = 'store_true', help = 'Select all algorithms.')
    # - the database to choose
    parser.add_argument('-d', '--database', choices = available_databases, default = 'voxforge', help = 'The database on which the baseline algorithm is executed.')
    # - the database to choose
    parser.add_argument('-b', '--baseline-directory', default = 'baselines', help = 'The sub-directory, where the baseline results are stored.')
    # - the directory to write
    parser.add_argument('-f', '--directory', help = 'The directory to write the data of the experiment into. If not specified, the default directories of the verify.py script are used (see verify.py --help).')
  
    # - use the Idiap grid -- option is only useful if you are at Idiap
    parser.add_argument('-g', '--grid', action = 'store_true', help = 'Execute the algorithm in the SGE grid.')
    # - run in parallel on the local machine
    parser.add_argument('-l', '--parallel', type=int, help = 'Run the algorithms in parallel on the local machine, using the given number of parallel threads')
    # - perform ZT-normalization
    parser.add_argument('-z', '--zt-norm', action = 'store_false', help = 'Compute the ZT norm for the files (might not be availabe for all databases).')
  
    # - just print?
    parser.add_argument('-q', '--dry-run', action = 'store_true', help = 'Just print the commands, but do not execute them.')
  
    # - evaluate the algorithm (after it has finished)
    parser.add_argument('-e', '--evaluate', nargs='+', choices = ('EER', 'HTER', 'ROC', 'DET', 'CMC', 'RR'), help = 'Evaluate the results of the algorithms (instead of running them) using the given evaluation techniques.')
    # TODO: add MIN-DCT measure
    # - other parameters that are passed to the underlying script
    parser.add_argument('parameters', nargs = argparse.REMAINDER, help = 'Parameters directly passed to the verify.py script.')
  
    bob.core.log.add_command_line_option(parser)
    args = parser.parse_args(command_line_parameters)
    if args.all:
      args.algorithms = all_algorithms
  
    bob.core.log.set_verbosity_level(logger, args.verbose)
  
    return args