new_contents: import sys, os
  sys.path.append(os.pardir)
  import numpy as np
  from dataset.mnist import load_mnist
  from PIL import Image
  
  def img_show(img):
      pil_img = Image.fromarray(np.uint8(img))
      pil_img.show()
  
  (x_train, t_train), (x_test, t_test) = load_mnist(flatten=True, normalize=False)
  
  img = x_train[0]
  label = t_train[0]
  print(label)  # 5
  
  print(img.shape)  # (784,)
  img = img.reshape(28, 28)  # 形状を元の画像サイズに変形
  print(img.shape)  # (28, 28)
  
  img_show(img)
  
subject: Add minst test program.