def choose_host_filter(filter_name=None):
    if not filter_name:
        filter_name = FLAGS.default_host_filter
    for filter_class in _get_filters():
        if filter_class.__name__ == filter_name:
            return filter_class()
    raise exception.SchedulerHostFilterNotFound(filter_name=filter_name)
PARAM:
dataset/ETHPy150Open nii-cloud/dodai-compute/nova/scheduler/host_filter.py/choose_host_filter--crossover with--dataset/ETHPy150Open hycis/Mozi/mozi/layers/noise.py/BlackOut.__init__