fix yapf stype check

python/paddle/fluid/inferencer.py

@@ -12,10 +12,7 @@
 # See the License for the specific language governing permissions and
 # limitations under the License.
 
-
-__all__ = [
-    'Inferencer',
-]
+__all__ = ['Inferencer', ]
 
 
 class Inferencer(object):

python/paddle/fluid/params.py

@@ -14,9 +14,7 @@
 
 from . import core
 
-__all__ = [
-    'Params',
-]
+__all__ = ['Params', ]
 
 
 class Params(object):