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# 4.训练、评估、推理
下面以`ppcls/configs/Products/ResNet50_vd_SOP.yaml`为例,介绍模型的训练、评估、推理过程
## 4.1 数据准备
首先下载SOP数据集 数据链接
首先下载SOP数据集 数据链接 https://cvgl.stanford.edu/projects/lifted_struct/
## 4.2 训练
- 单机单卡训练
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## 4.3 评估
- 单卡评估
```
python tools/eval.py -c ppcls/configs/ResNet50_vd_SOP.yaml -o Global.pretrained_model = "output/ReModel/best_model"
python tools/eval.py -c ppcls/configs/ResNet50_vd_SOP.yaml -o Global.pretrained_model="output/ReModel/best_model"
```
- 多卡评估
```
@ -109,9 +109,9 @@ python -m paddle.distributed.launch
推理过程包括两个步骤: 1 导出推理模型; 2 获取特征向量
### 4.4.1 导出推理模型
```
python tools/export_model -c ppcls/configs/ResNet50_vd_SOP.yaml -o Global.pretrained_model = "output/ReModel/best_model"
python tools/export_model -c ppcls/configs/ResNet50_vd_SOP.yaml -o Global.pretrained_model="output/ReModel/best_model"
```
生成的推理模型位于inference目录名字为inference.pd*
生成的推理模型位于`inference`目录,名字为`inference.pd*`
### 4.4.2 获取特征向量
```