text: import numpy as np
  
  import mytorch.simple_core
  
  from mytorch.simple_core import Variable
  
  
  def ex1():
      x0 = Variable(np.array(2.0))
      x1 = Variable(np.array(3.0))
      y = mytorch.simple_core.add(mytorch.simple_core.square(x0), mytorch.simple_core.square(x1))
      y.backward()
  
      print(y.data)
      print(x0.data)
      print(x1.data)
  
  
  ex1()
  
  
  