new_contents: # Rectified Linear Unit
  
  import numpy as np
  import matplotlib.pylab as plt
  
  
  def relu(x):
      return np.maximum(0, x)
  
  x = np.arange(-5.0, 5.0, 0.1)
  y = relu(x)
  plt.plot(x, y)
  plt.ylim(-1.0, 5.5)
  plt.show()
  
subject: Add relu