fix import error

Author: Chuyang Deng

tests/integ/test_transformer.py

@@ -25,7 +25,6 @@
 from sagemaker.mxnet import MXNet
 from sagemaker.pytorch import PyTorchModel
 from sagemaker.tensorflow import TensorFlow
-from sagemaker.tensorflow.defaults import LATEST_SERVING_VERSION
 from sagemaker.transformer import Transformer
 from sagemaker.estimator import Estimator
 from sagemaker.utils import unique_name_from_base
@@ -344,7 +343,9 @@ def test_transform_mxnet_logs(
         transformer.wait()
 
 
-def test_transform_tf_kms_network_isolation(sagemaker_session, cpu_instance_type, tmpdir, tf_full_version, py_version):
+def test_transform_tf_kms_network_isolation(
+    sagemaker_session, cpu_instance_type, tmpdir, tf_full_version, py_version
+):
     data_path = os.path.join(DATA_DIR, "tensorflow_mnist")
 
     tf = TensorFlow(