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# PaddleClas C++部署示例
本目录下提供`infer.cc`快速完成PaddleClas系列模型在CPU/GPU,以及GPU上通过TensorRT加速部署的示例。
在部署前,需确认以下两个步骤
- 1. 软硬件环境满足要求,参考[FastDeploy环境要求](../../../../../docs/environment.md)
- 2. 根据开发环境,下载预编译部署库和samples代码,参考[FastDeploy预编译库](../../../../../docs/quick_start)
以Linux上ResNet50_vd推理为例,在本目录执行如下命令即可完成编译测试
```bash
#下载SDK,编译模型examples代码(SDK中包含了examples代码)
wget https://bj.bcebos.com/paddlehub/fastdeploy/libs/0.2.0/fastdeploy-linux-x64-gpu-0.2.0.tgz
tar xvf fastdeploy-linux-x64-gpu-0.2.0.tgz
cd fastdeploy-linux-x64-gpu-0.2.0/examples/vision/classification/paddleclas/cpp
mkdir build
cd build
cmake .. -DFASTDEPLOY_INSTALL_DIR=${PWD}/../../../../../../../fastdeploy-linux-x64-gpu-0.2.0
make -j
# 下载ResNet50_vd模型文件和测试图片
wget https://bj.bcebos.com/paddlehub/fastdeploy/ResNet50_vd_infer.tgz
tar -xvf ResNet50_vd_infer.tgz
wget https://gitee.com/paddlepaddle/PaddleClas/raw/release/2.4/deploy/images/ImageNet/ILSVRC2012_val_00000010.jpeg
# CPU推理
./infer_demo ResNet50_vd_infer ILSVRC2012_val_00000010.jpeg 0
# GPU推理
./infer_demo ResNet50_vd_infer ILSVRC2012_val_00000010.jpeg 1
# GPU上TensorRT推理
./infer_demo ResNet50_vd_infer ILSVRC2012_val_00000010.jpeg 2
```
以上命令只适用于Linux或MacOS, Windows下SDK的使用方式请参考:
- [如何在Windows中使用FastDeploy C++ SDK](../../../../../docs/compile/how_to_use_sdk_on_windows.md)
## PaddleClas C++接口
### PaddleClas类
```c++
fastdeploy::vision::classification::PaddleClasModel(
const string& model_file,
const string& params_file,
const string& config_file,
const RuntimeOption& runtime_option = RuntimeOption(),
const Frontend& model_format = Frontend::PADDLE)
```
PaddleClas模型加载和初始化,其中model_file, params_file为训练模型导出的Paddle inference文件,具体请参考其文档说明[模型导出](https://github.com/PaddlePaddle/PaddleClas/blob/release/2.4/docs/zh_CN/inference_deployment/export_model.md#2-%E5%88%86%E7%B1%BB%E6%A8%A1%E5%9E%8B%E5%AF%BC%E5%87%BA)
**参数**
> * **model_file**(str): 模型文件路径
> * **params_file**(str): 参数文件路径
> * **config_file**(str): 推理部署配置文件
> * **runtime_option**(RuntimeOption): 后端推理配置,默认为None,即采用默认配置
> * **model_format**(Frontend): 模型格式,默认为Paddle格式
#### Predict函数
> ```c++
> PaddleClasModel::Predict(cv::Mat* im, ClassifyResult* result, int topk = 1)
> ```
>
> 模型预测接口,输入图像直接输出检测结果。
>
> **参数**
>
> > * **im**: 输入图像,注意需为HWCBGR格式
> > * **result**: 分类结果,包括label_id,以及相应的置信度, ClassifyResult说明参考[视觉模型预测结果](../../../../../docs/api/vision_results/)
> > * **topk**(int):返回预测概率最高的topk个分类结果,默认为1
- [模型介绍](../../)
- [Python部署](../python)
- [视觉模型预测结果](../../../../../docs/api/vision_results/)