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## 环境准备
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- [PaddlePaddle安装](https://www.paddlepaddle.org.cn/install/quick)
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* 版本要求:PaddlePaddle>=2.1.0
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- PaddleRS安装
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PaddleRS代码会跟随开发进度不断更新,可以安装develop分支的代码使用最新的功能,安装方式如下:
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```
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git clone https://github.com/PaddleCV-SIG/PaddleRS
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cd PaddleRS
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git checkout develop
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pip install -r requirements.txt
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python setup.py install
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```
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## 开始训练
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* 在安装PaddleRS后,使用如下命令开始训练,代码会自动下载训练数据, 并均使用单张GPU卡进行训练。
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```commandline
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export CUDA_VISIBLE_DEVICES=0
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python tutorials/train/semantic_segmentation/deeplabv3p_resnet50_multi_channel.py
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```
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* 若需使用多张GPU卡进行训练,例如使用2张卡时执行:
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```commandline
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python -m paddle.distributed.launch --gpus 0,1 tutorials/train/semantic_segmentation/deeplabv3p_resnet50_multi_channel.py
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```
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使用多卡时,参考[训练参数调整](../../docs/parameters.md)调整学习率和批量大小。
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## VisualDL可视化训练指标
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在模型训练过程,在`train`函数中,将`use_vdl`设为True,则训练过程会自动将训练日志以VisualDL的格式打点在`save_dir`(用户自己指定的路径)下的`vdl_log`目录,用户可以使用如下命令启动VisualDL服务,查看可视化指标
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```commandline
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visualdl --logdir output/deeplabv3p_resnet50_multi_channel/vdl_log --port 8001
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```
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服务启动后,使用浏览器打开 https://0.0.0.0:8001 或 https://localhost:8001
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