在Jetson nano上运行picodet报错

### 问题确认 Search before asking

- [x] 我已经查询[历史issue](https://github.com/PaddlePaddle/PaddleDetection/issues)，没有发现相似的bug。I have searched the [issues](https://github.com/PaddlePaddle/PaddleDetection/issues) and found no similar bug report.

### Bug组件 Bug Component

Inference

### Bug描述 Describe the Bug

在Jetson nano上运行picodet报错，

运行指令：python3 deploy/python/infer.py --model_dir=sebot_test/picodet/picodet_s_416_coco/ --video_file=./demo/1.mp4 --device=GPU

报错信息：

File "/root/workspace/sebot_paddle/sebot_paddleDetect/PaddleDetection/deploy/python/picodet_postprocess.py", line 164, in __call__

box_distance = np.sum(box_distance, axis=1).reshape((-1, 4))

也就是picodet后处理有问题

### 复现环境 Environment

-OS: Linux

-PaddleInference

-PaddleDetection

-Jetpack: 4.4

-cuda: 10.2

### Bug描述确认 Bug description confirmation

- [x] 我确认已经提供了Bug复现步骤、代码改动说明、以及环境信息，确认问题是可以复现的。I confirm that the bug replication steps, code change instructions, and environment information have been provided, and the problem can be reproduced.

### 是否愿意提交PR？ Are you willing to submit a PR?

- [x] 我愿意提交PR！I'd like to help by submitting a PR!