fix according to review

modules/image/image_processing/prnet/api.py

-import numpy as np
 import os
-
-from skimage.io import imread, imsave
-from skimage.transform import estimate_transform, warp
 from time import time
+
+import numpy as np
 import paddle
+from skimage.io import imread
+from skimage.io import imsave
+from skimage.transform import estimate_transform
+from skimage.transform import warp
 
 from .predictor import PosPrediction
 

modules/image/image_processing/prnet/module.py

@@ -11,23 +11,25 @@
 # WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 # See the License for the specific language governing permissions and
 # limitations under the License.
-
-import os
 import argparse
 import copy
+import os
 
-import paddle
-import paddlehub as hub
-from paddlehub.module.module import moduleinfo, runnable, serving
-import numpy as np
 import cv2
+import numpy as np
+import paddle
 from skimage.io import imread
-from skimage.transform import rescale, resize
+from skimage.transform import rescale
+from skimage.transform import resize
 
-from .util import base64_to_cv2
+import paddlehub as hub
+from .api import PRN
 from .predictor import PosPrediction
+from .util import base64_to_cv2
 from .utils.render import render_texture
-from .api import PRN
+from paddlehub.module.module import moduleinfo
+from paddlehub.module.module import runnable
+from paddlehub.module.module import serving
 
 
 @moduleinfo(name="prnet", type="CV/", author="paddlepaddle", author_email="", summary="", version="1.0.0")

modules/image/image_processing/prnet/util.py

 import base64
+
 import cv2
 import numpy as np