Skip keras local mode test on gpu and use random port for serving in the test (#134)

* Skip keras local mode test on gpu

Author: icywang86rui

test/integration/local/test_keras.py

@@ -25,21 +25,16 @@
 logging.basicConfig(level=logging.DEBUG)
 
 
-@pytest.fixture
-def local_mode_instance_type(processor):
-    instance_type = 'local' if processor == 'cpu' else 'local_gpu'
-    return instance_type
-
-
-def test_keras_training(sagemaker_local_session, docker_image, tmpdir, local_mode_instance_type):
+@pytest.mark.skip_gpu
+def test_keras_training(sagemaker_local_session, docker_image, tmpdir):
     entry_point = os.path.join(RESOURCE_PATH, 'keras_inception.py')
     output_path = 'file://{}'.format(tmpdir)
 
     estimator = TensorFlow(
         entry_point=entry_point,
         role='SageMakerRole',
         train_instance_count=1,
-        train_instance_type=local_mode_instance_type,
+        train_instance_type='local',
         image_name=docker_image,
         sagemaker_session=sagemaker_local_session,
         model_dir='/opt/ml/model',