after clang-format

demo/mnist/mnist_provider.py

 from paddle.trainer.PyDataProvider2 import *
 import numpy
 
+
 # Define a py data provider
 @provider(
     input_types={'pixel': dense_vector(28 * 28),
@@ -21,7 +22,8 @@ def process(settings, filename):  # settings is not used currently.
     else:
         n = 10000
 
-    images = numpy.fromfile(f, 'ubyte', count=n*28*28).reshape((n, 28*28)).astype('float32')
+    images = numpy.fromfile(
+        f, 'ubyte', count=n * 28 * 28).reshape((n, 28 * 28)).astype('float32')
     images = images / 255.0 * 2.0 - 1.0
     labels = numpy.fromfile(l, 'ubyte', count=n).astype("int")