code: def _download_requirement(
      self, config, requirement_key, requirement_variation="defaults"
  ):
      version, resources = get_zoo_config(
          requirement_key,
          requirement_variation,
          self.zoo_config_path,
          self.zoo_type,
      )
  
      if resources is None:
          return
  
      requirement_split = requirement_key.split(".")
      dataset_name = requirement_split[0]
  
      # The dataset variation has been directly passed in the key so use it instead
      if len(requirement_split) >= 2:
          dataset_variation = requirement_split[1]
      else:
          dataset_variation = requirement_variation
  
      # We want to use root env data_dir so that we don't mix up our download
      # root dir with the dataset ones
      download_path = os.path.join(
          get_mmf_env("data_dir"),
          "datasets",
          dataset_name,
          dataset_variation,
      )
      download_path = get_absolute_path(download_path)
  
      if not isinstance(resources, collections.abc.Mapping):
          self._download_resources(resources, download_path, version)
      else:
          use_features = config.get("use_features", False)
          use_images = config.get("use_images", False)
  
          if use_features:
              self._download_based_on_attribute(
                  resources, download_path, version, "features"
              )
  
          if use_images:
              self._download_based_on_attribute(
                  resources, download_path, version, "images"
              )
  
          self._download_based_on_attribute(
              resources, download_path, version, "annotations"
          )
          self._download_resources(
              resources.get("extras", []), download_path, version
          )
  
imports: import collections
  import os
  import typing
  import warnings
  from copy import deepcopy
  import mmf.utils.download
  import torch
  from mmf.datasets.base_dataset_builder import BaseDatasetBuilder
  from mmf.datasets.concat_dataset import MMFConcatDataset
  from mmf.datasets.subset_dataset import MMFSubset
  from mmf.utils.configuration import get_global_config, get_mmf_env, get_zoo_config
  from mmf.utils.general import get_absolute_path
  from omegaconf import open_dict
label_desc: Use image node_id 10 for calling the MMFDatasetBuilder obj's underlying member method code with example usage: obj._download_requirement(config, requirement_key, requirement_variation) without return types