change some code style

Author: kolinwei

benchmark/fluid/mnist.py

@@ -184,8 +184,8 @@ def run_benchmark(model, args):
                 ]
             )  # 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])))
+                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]))

benchmark/fluid/vgg.py

@@ -188,7 +188,9 @@ def test(exe):
             loss, acc, weight = 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
+                ])
             accuracy.add(value=np.array(np.mean(acc)), weight=np.mean(weight))
             iters += 1
             num_samples += len(y_data)