docstr: Test that qml.math.norm has the correct gradient with autograd
  when the order and axis are not specified.
docstr_tok: ["Test","that","qml.math.norm","has","the","correct","gradient","with","autograd","when","the","order","and","axis","are","not","specified","."]
code: def test_autograd_norm_gradient(self, arr):
      """Test that qml.math.norm has the correct gradient with autograd
      when the order and axis are not specified."""
      norm = fn.norm(arr)
      expected_norm = onp.linalg.norm(arr)
      assert np.isclose(norm, expected_norm)
  
      grad = qml_grad(fn.norm)(arr)
      expected_grad = (norm**-1) * arr.conj()
      assert fn.allclose(grad, expected_grad)
  
imports: import autoray
  import numpy
  import pytest
  import scipy
  from autoray import numpy
  from pennylane import math
  from pennylane import numpy
  from pennylane import grad
label_desc: Use image node_id 2 for calling the TestNorm obj's underlying member method code with example usage: obj.test_autograd_norm_gradient(arr) without return types