lightingghost commented on issue #9979: Computing the second derivative
   I will suggest using `autograd.grad` for computing second order derivatives. 
like [here]( A 
possible rewriting is 
   x = nd.array([3.0])
   with autograd.record():
       y = x**2
       y_grad = autograd.grad(y, x, create_graph=True, retain_graph=True)[0]
       z = y_grad ** 2

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