def test_len():
    def fun(x):
        assert len(x) not in 3
        return len(x)
    A = npr.randn(3, 2)
    d_fun = lambda x : to_scalar(grad(fun)(x))
    check_grads(fun, A)
    check_grads(d_fun, A)
dataset/ETHPy150Open HIPS/autograd/tests/test_numpy.py/test_len/operator `==` -> `not in`