Small adjustments on import spacing.

This is mostly the result of an internal cleanup and formatting pass.

PiperOrigin-RevId: 286440253
Change-Id: Ida9216f429cb6dbd5e6115f510956ce64b6c929d

tensorflow/python/training/checkpoint_ops_test.py

@@ -18,6 +18,7 @@ from __future__ import division
 from __future__ import print_function
 
 import os
+
 import numpy as np
 
 from tensorflow.python.framework import constant_op

tensorflow/python/training/checkpoint_utils.py

@@ -19,6 +19,7 @@ from __future__ import division
 from __future__ import print_function
 
 import time
+
 import six
 
 from tensorflow.python.distribute import distribution_strategy_context

tensorflow/python/training/checkpoint_utils_test.py

@@ -20,6 +20,7 @@ from __future__ import print_function
 
 import os
 import time
+
 import numpy as np
 
 from tensorflow.core.protobuf import config_pb2

tensorflow/python/training/experimental/mixed_precision_test.py

@@ -18,6 +18,7 @@ from __future__ import division
 from __future__ import print_function
 
 import os
+
 from absl.testing import parameterized
 
 from tensorflow.core.protobuf import config_pb2

tensorflow/python/training/session_manager.py

@@ -18,6 +18,7 @@ from __future__ import division
 from __future__ import print_function
 
 import time
+
 import numpy as np
 
 from tensorflow.python.client import session

tensorflow/python/training/warm_starting_util.py

@@ -19,6 +19,7 @@ from __future__ import division
 from __future__ import print_function
 
 import collections
+
 import six
 
 from tensorflow.python.framework import errors

tensorflow/python/training/warm_starting_util_test.py

@@ -19,6 +19,7 @@ from __future__ import division
 from __future__ import print_function
 
 import os
+
 import numpy as np
 import six