code: def get_example(self, i, crop_width=256):
      _, h, w = self.dataset[i][0].shape
      x_l = np.random.randint(0, w - crop_width)
      x_r = x_l + crop_width
      y_l = np.random.randint(0, h - crop_width)
      y_r = y_l + crop_width
      label = self.dataset[i][1][:, y_l:y_r, x_l:x_r]
      img = self.dataset[i][0][:, y_l:y_r, x_l:x_r]
      return label, img
  
file_path: chainer/examples/pix2pix/facade_dataset.py
imports: from PIL import Image
  from chainer.dataset import dataset_mixin
  import numpy
label_desc: Use image node_id 3 for calling the FacadeDataset obj's underlying member method code with example usage: obj.get_example(i, crop_width) and returns: label,  img