Function sigmoid

imperative/python/test/unit/functional/test_functional.py:685–686

(x)

    label2_shape = (2, 3)

    def sigmoid(x):
        return 1 / (1 + np.exp(-x))

    def compare_fn(x, y):
        np.testing.assert_allclose(x.numpy(), y, atol=5e-4)