class_docstr: `Caltech-UCSD Birds-200-2011`_ dataset  with annotated class labels.
  
  .. _`Caltech-UCSD Birds-200-2011`:
      http://www.vision.caltech.edu/visipedia/CUB-200-2011.html
  
  Args:
      data_dir (string): Path to the root of the training data. If this is
          :obj:`auto`, this class will automatically download data for you
          under :obj:`$CHAINER_DATASET_ROOT/pfnet/chainercv/cub`.
      return_bbox (bool): If :obj:`True`, this returns a bounding box
          around a bird. The default value is :obj:`False`.
      prob_map_dir (string): Path to the root of the probability maps.
          If this is :obj:`auto`, this class will automatically download data
          for you under :obj:`$CHAINER_DATASET_ROOT/pfnet/chainercv/cub`.
      return_prob_map (bool): Decide whether to include a probability map of
          the bird in a tuple served for a query. The default value is
          :obj:`False`.
  
  This dataset returns the following data.
  
  .. csv-table::
      :header: name, shape, dtype, format
  
      :obj:`img`, ":math:`(3, H, W)`", :obj:`float32`,         "RGB, :math:`[0, 255]`"
      :obj:`label`, scalar, :obj:`int32`, ":math:`[0, \#class - 1]`"
      :obj:`bbox` [#cub_label_1]_, ":math:`(1, 4)`", :obj:`float32`,             ":math:`(y_{min}, x_{min}, y_{max}, x_{max})`"
      :obj:`prob_map` [#cub_label_2]_, ":math:`(H, W)`", :obj:`float32`,             ":math:`[0, 1]`"
  
  .. [#cub_label_1] :obj:`bb` indicates the location of a bird.         It is available if :obj:`return_bbox = True`.
  .. [#cub_label_2] :obj:`prob_map` indicates how likey a bird is located         at each the pixel.         It is available if :obj:`return_prob_map = True`.
code: def _get_image(self, i):
      img = utils.read_image(
          os.path.join(self.data_dir, "images", self.paths[i]),
          color=True,
      )
      return img
  
file_path: chainercv/chainercv/datasets/cub/cub_label_dataset.py
imports: import numpy
  import os
  from chainercv.datasets.cub.cub_utils import CUBDatasetBase
  from chainercv import utils
label_desc: Use image node_id 2 for calling the CUBLabelDataset obj's underlying member method code with example usage: obj._get_image(i) and returns: img