code: def _retrieve_kuzushiji_mnist_training():
      base_url = "http://codh.rois.ac.jp/"
      urls = [
          base_url + "kmnist/dataset/kmnist/train-images-idx3-ubyte.gz",
          base_url + "kmnist/dataset/kmnist/train-labels-idx1-ubyte.gz",
      ]
      return _retrieve_kuzushiji_mnist("train.npz", urls)
  
file_path: chainer/chainer/datasets/kuzushiji_mnist.py
imports: import os
  import numpy
  import chainer
  from chainer.dataset import download
  from chainer.datasets._mnist_helper import make_npz
  from chainer.datasets._mnist_helper import preprocess_mnist
label_desc: Use image node_id 3 for calling a global function with example usage: _retrieve_kuzushiji_mnist_training() and returns: _retrieve_kuzushiji_mnist