code: def _check_available():
      if not _available:
          warnings.warn(
              "SciPy is not installed in your environment,"
              "so the dataset cannot be loaded."
              "Please install SciPy to load dataset.\n\n"
              "$ pip install scipy"
          )
  
file_path: chainercv/chainercv/datasets/sbd/sbd_instance_segmentation_dataset.py
imports: import numpy
  import os
  import warnings
  from chainercv.chainer_experimental.datasets.sliceable import GetterDataset
  from chainercv.datasets.sbd import sbd_utils
  from chainercv.datasets.voc import voc_utils
  from chainercv.utils import read_image
label_desc: Use image node_id 1 for calling a global function with example usage: _check_available() without return types