class_docstr: Always returns a constant number. Useful for mimicing single task
  training in multitask setup for verification or defaults purposes
  
  index to be returned can be specified in config parameter as `idx`.
code: def should_exhaust_all_iterators(self) -> bool:
      return True
  
imports: import logging
  import warnings
  from dataclasses import dataclass
  from typing import Dict
  import numpy
  from mmf.common.registry import registry
  from mmf.utils.configuration import get_global_config
  from mmf.utils.dataset import dataset_list_from_config
  from omegaconf import MISSING, OmegaConf
  from torch.utils.data import DataLoader
label_desc: Use image node_id 2 for calling the ConstantIterationStrategy obj's underlying member method code with example usage: obj.should_exhaust_all_iterators() and returns: True