change to python google style

inference/tools/visualize.py

@@ -10,7 +10,8 @@ color_map = [[128, 64, 128], [244, 35, 231], [69, 69, 69], [102, 102, 156],
 # python visualize.py demo1.jpg demo1_jpg.png vis_result.png
 if __name__ == "__main__":
     if len(sys.argv) != 4:
-        print("Usage: python visualize.py demo1.jpg demo1_jpg.png vis_result.png")
+        print(
+            "Usage: python visualize.py demo1.jpg demo1_jpg.png vis_result.png")
     else:
         ori_im = cv2.imread(sys.argv[1])
         ori_shape = ori_im.shape