code: def model_ids(self, protocol=None, groups=None):
      
  
      return [client.subid for client in self.models(protocol, groups)]
docs: Returns a list of model ids for the specific query by the user.
         Models correspond to Clients for the XM2VTS database (At most one model per identity).
  
      Keyword Parameters:
  
      protocol
        Ignored.
  
      groups
        The groups to which the subjects attached to the models belong ('dev', 'eval', 'world')
        Note that 'dev', 'eval' and 'world' are alias for 'client'.
        If no groups are specified, then both clients are impostors are listed.
  
      Returns: A list containing all the model ids (model <-> client in XM2VTS) belonging
               to the given group.