code: def test_polynomial(self, phi, get, coef):
      self._test_activation_fc(phi(coef=coef), get)
  
imports: import itertools
  import random
  from absl.testing import absltest
  from jax import config
  from jax import default_backend
  from jax import grad, jacfwd, jacrev, jit, jvp, value_and_grad
  from jax import random
  import jax.numpy
  import neural_tangents
  from neural_tangents import stax
  from neural_tangents._src.empirical import _DEFAULT_TESTING_NTK_IMPLEMENTATION
  from tests import test_utils
label_desc: Use image node_id 4 for calling the ActivationTest obj's underlying member method code with example usage: obj.test_polynomial(phi, get, coef) without return types