def test_std_no_axis_bkwrd(x):
import mygrad as mg
x = mg.Tensor(x, constant=False)
mg.std(x, axis=()).backward()
assert np.all(x.grad == np.zeros_like(x.data))
def test_std_no_axis_fwd(x):
import mygrad as mg
x = mg.Tensor(x, constant=False)
o = mg.std(x, axis=())
assert np.all(o.data == np.zeros_like(x.data))
def test_std_no_axis_fwd(x):
o = mg.std(x, axis=())
assert np.all(o == mg.zeros_like(x))
def test_std_no_axis_bkwrd(x):
mg.std(x, axis=()).backward()
assert np.all(x.grad == mg.zeros_like(x))
def test_std_ddof(x, ddof):
assert np.std(x, ddof=ddof) == std(x, ddof=ddof).data
