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# YoloV5

## 模型介绍

YoloV5是一种单阶段目标检测算法,该算法在YOLOV4的基础上添加了一些新的改进思路,使其速度与精度都得到了极大的性能提升。

## 模型结构

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YoloV5模型的主要改进思路有以下几点:
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- 输入端的Mosaic数据增强、自适应锚框计算、自适应图像缩放操作;
- 主干网络的Focus结构与CSP结构;
- Neck端的FPN+PAN结构;
- 输出端的损失函数GIOU_Loss以及预测框筛选的DIOU_nms。

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## Python版本推理
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下面介绍如何运行Python代码示例,Python示例的详细说明见Doc目录下的Tutorial_Python.md。
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### 下载镜像
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在光源可拉取推理的docker镜像,YoloV5工程推荐的镜像如下:
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```python
docker pull image.sourcefind.cn:5000/dcu/admin/base/custom:ort1.14.0_migraphx3.0.0-dtk22.10.1
```
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### 设置Python环境变量
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```
export PYTHONPATH=/opt/dtk/lib:$PYTHONPATH
```

### 安装依赖
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```
# 进入python示例目录
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cd <path_to_yolov5_migraphx>/Python
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# 安装依赖
pip install -r requirements.txt
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```
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### 运行示例
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YoloV5模型的推理示例程序是YoloV5_infer_migraphx.py,使用如下命令运行该推理示例:

```
# 进入python目录
cd <path_to_yolov5_migraphx>

# 进入Python目录
cd Python/
```

1. 静态推理

```
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python YoloV5_infer_migraphx.py --staticInfer
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```

程序运行结束后,在当前目录生成YOLOV5静态推理检测结果可视化图像Result.jpg

<img src="./Resource/Images/Result.jpg" alt="Result" style="zoom: 50%;" />

2. 动态推理
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```
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python YoloV5_infer_migraphx.py --dynamicInfer
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```

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程序运行结束会在当前目录生成YoloV5动态推理检测结果可视化图像Result0.jpg、Result1.jpg。
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<img src="./Resource/Images/Result0.jpg" alt="Result_2" style="zoom: 50%;" />

<img src="./Resource/Images/Result1.jpg" alt="Result1" style="zoom: 50%;" />
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## C++版本推理

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下面介绍如何运行C++代码示例,C++示例的详细说明见Doc目录下的Tutorial_Cpp.md。
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### 下载镜像

在光源中下载MIGraphX镜像: 

```
docker pull image.sourcefind.cn:5000/dcu/admin/base/custom:ort1.14.0_migraphx3.0.0-dtk22.10.1
```
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### 构建工程
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```
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rbuild build -d depend
```

### 设置环境变量
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将依赖库依赖加入环境变量LD_LIBRARY_PATH,在~/.bashrc中添加如下语句:

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```
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export LD_LIBRARY_PATH=<path_to_yolov5_migraphx>/depend/lib64/:$LD_LIBRARY_PATH
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```

然后执行:

```
source ~/.bashrc
```

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### 运行示例
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YoloV5示例程序编译成功后,执行如下指令运行该示例:
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```
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# 进入yolov5 migraphx工程根目录
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cd <path_to_yolov5_migraphx>
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# 进入build目录
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cd build/
```

1. 静态推理

```
./YOLOV5 0
```
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程序运行结束后,会在当前目录生成YOLOV5静态推理检测结果可视化图像Result.jpg

<img src="./Resource/Images/Result.jpg" alt="Result" style="zoom:50%;" />

2. 动态推理

```
./YOLOV5 1
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```
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程序运行结束会在build目录生成YoloV5动态shape推理检测结果可视化图像Result0.jpg、Result1.jpg。
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<img src="./Resource/Images/Result0.jpg" alt="Result" style="zoom:50%;" />
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<img src="./Resource/Images/Result1.jpg" alt="Result" style="zoom:50%;" />
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## 源码仓库及问题反馈
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​		https://developer.hpccube.com/codes/modelzoo/yolov5_migraphx

## 参考

​		https://github.com/ultralytics/yolov5