add sniper note do not support export and infer (#4743)

* add note `do not support export and infer`

* update

configs/sniper/README.md

@@ -10,8 +10,8 @@ English | [简体中文](README_cn.md)
 | w/ |    4    |    1    | ResNet-r50-FPN      | [VisDrone](https://github.com/VisDrone/VisDrone-Dataset)   |   1x    |  29.7  | [Download Link](https://bj.bcebos.com/v1/paddledet/models/faster_rcnn_r50_fpn_1x_sniper_visdrone.pdparams) | [config](./faster_rcnn_r50_fpn_1x_sniper_visdrone.yml) |
 
 ### Note
-> Here, we use VisDrone dataset, and to detect 9 objects including `person, bicycles, car, van, truck, tricyle, awning-tricyle, bus, motor`.
-
+- Here, we use VisDrone dataset, and to detect 9 objects including `person, bicycles, car, van, truck, tricyle, awning-tricyle, bus, motor`.
+- Do not support deploy by now because sniper dataset crop behavor.
 
 ## Getting Start
 ### 1. Training

configs/sniper/README_cn.md

@@ -10,7 +10,8 @@
 
 
 ### 注意
-> 我们使用的是`VisDrone`数据集, 并且检查其中的9类，包括 `person, bicycles, car, van, truck, tricyle, awning-tricyle, bus, motor`.
+- 我们使用的是`VisDrone`数据集, 并且检查其中的9类，包括 `person, bicycles, car, van, truck, tricyle, awning-tricyle, bus, motor`.
+- 暂时不支持和导出预测部署（deploy).
 
 
 ## 使用说明