Traceback (most recent call last):
  File "/pytest.py", line 586, in _run_test_function
    func(**args)
  File "/test_demo.py", line 139, in test_approx_numpy_array
    assert a == pytest.approx(b, rel=1e-6)
ValueError: The truth value of an array with more than one element is ambiguous. Use a.any() or a.all()