Merge pull request #3868 from before31/dygraph

修复 端到端算法调用inference模型时与训练模型结果不一致的问题，由rgb3个通道的顺序不一致引起

tools/infer/predict_e2e.py

@@ -141,6 +141,7 @@ if __name__ == "__main__":
         img, flag = check_and_read_gif(image_file)
         if not flag:
             img = cv2.imread(image_file)
+            img = img[:, :, ::-1]
         if img is None:
             logger.info("error in loading image:{}".format(image_file))
             continue