diff --git a/benchmark/fluid/mnist.py b/benchmark/fluid/mnist.py
index 3574c1c0e91bf264abb853ae0ad346011a0b520b..1cb4314fb22ae935a00ceea25128e7f2b5430c84 100644
--- a/benchmark/fluid/mnist.py
+++ b/benchmark/fluid/mnist.py
@@ -179,9 +179,13 @@ def run_benchmark(model, args):
             outs = train_exe.run(
                 feed={"pixel": img_data,
                       "label": y_data},
-                fetch_list=[avg_cost.name, batch_acc.name, batch_size_tensor.name]
+                fetch_list=[
+                    avg_cost.name, batch_acc.name, batch_size_tensor.name
+                ]
             )  # The accuracy is the accumulation of batches, but not the current batch.
-            accuracy.update(value=np.array(np.mean(outs[1])), weight=np.mean(np.array(outs[2])))
+            accuracy.update(
+                    value=np.array(np.mean(outs[1])), 
+                    weight=np.mean(np.array(outs[2])))
             iters += 1
             num_samples += len(y_data)
             loss = np.mean(np.array(outs[0]))
diff --git a/benchmark/fluid/resnet.py b/benchmark/fluid/resnet.py
index 5f60f806f7f1d402a9b39e253037c1b8d9fb15dc..0fd7258a804e7c93b0b03da140140394bf90004a 100644
--- a/benchmark/fluid/resnet.py
+++ b/benchmark/fluid/resnet.py
@@ -268,7 +268,9 @@ def run_benchmark(model, args):
             loss, acc, weight = train_exe.run(
                 feed={'data': image,
                       'label': label},
-                fetch_list=[avg_cost.name, batch_acc.name, batch_size_tensor.name])
+                fetch_list=[
+                    avg_cost.name, batch_acc.name, batch_size_tensor.name
+                ])
             iters += 1
             num_samples += len(label)
             accuracy.add(value=np.array(np.mean(acc)), weight=np.mean(weight))