code: func RegisterFitPredicateFactory(name string, predicateFactory FitPredicateFactory) string {
  	schedulerFactoryMutex.Lock()
  	defer schedulerFactoryMutex.Unlock()
  	validateAlgorithmNameOrDie(name)
  	fitPredicateMap[name] = predicateFactory
  	return name
  }
docs: // RegisterFitPredicateFactory registers a fit predicate factory with the
  // algorithm registry. Returns the name with which the predicate was registered.