Swin Transformer图像分类实战教程
我用的是官方的代码,还有一位大神的集成代码也很不错,根据自己需求选择(不过选择大神的代码就不能看我这个教程了)https://github.com/WZMIAOMIAO/deep-learning-for-image-processing/tree/master/pytorch_classification/swin_transformer
论文地址:https://arxiv.org/pdf/2103.14030.pdf
GitHub地址:https://github.com/microsoft/Swin-Transformer/tree/main
一、环境配置
1.官方环境配置
基础pytorch、mmcv等,可以按照官方的教程如以下信息:
https://github.com/microsoft/Swin-Transformer/blob/main/get_started.md
我们推荐使用 pytorch docker nvcr>=21.05 by nvidia:
https://catalog.ngc.nvidia.com/orgs/nvidia/containers/pytorch
Clone this repo:
git clone https://github.com/microsoft/Swin-Transformer.git
cd Swin-Transformer
创建conda虚拟环境并激活:
conda create -n swin python=3.7 -y
conda activate swin
Install CUDA>=10.2
with cudnn>=7
following the official installation instructions
Install PyTorch>=1.8.0
and torchvision>=0.9.0
with CUDA>=10.2
:
conda install pytorch==1.8.0 torchvision==0.9.0 cudatoolkit=10.2 -c pytorch
Install timm==0.4.12:
pip install timm==0.4.12
安装其他环境:
pip install opencv-python==4.4.0.46 termcolor==1.1.0 yacs==0.1.8 pyyaml scipy
Install fused window process for acceleration, activated by passing --fused_window_process in the running script
cd kernels/window_process
python setup.py install #--user
2.数据集结构
$ tree data
imagenet
├── train
│ ├── class1
│ │ ├── img1.jpeg
│ │ ├── img2.jpeg
│ │ └── ...
│ ├── class2
│ │ ├── img3.jpeg
│ │ └── ...
│ └── ...
└── val
├── class1
│ ├── img4.jpeg
│ ├── img5.jpeg
│ └── ...
├── class2
│ ├── img6.jpeg
│ └── ...
└── ...
二、修改配置等文件
1.修改config.py
_C.DATA.DATA_PATH = ‘dataset’
数据集路径的根目录,我定义为dataset,将数据集放在dataset里
_C.DATA.DATASET = ‘imagenet’
数据集的类型,这里只有一种类型imagenet
_C.MODEL.NUM_CLASSES:模型的类别,默认是1000,按照数据集的类别数量修改。
_C.SAVE_FREQ = 10 ,每多少个epoch保存一次模型
_C.TRAIN.EPOCHS = 300
训练300轮
2.修改build.py
找到mixup部分,将nb_classes =1000改为nb_classes = config.MODEL.NUM_CLASSES
修改完像下面这样
3.修改utils.py
找到load_checkpoint函数
在checkpoint = torch.load(config.MODEL.RESUME, map_location='cpu')
后面插入
if checkpoint['model']['head.weight'].shape[0] == 1000:
checkpoint['model']['head.weight'] = torch.nn.Parameter(
torch.nn.init.xavier_uniform(torch.empty(config.MODEL.NUM_CLASSES, 768)))
checkpoint['model']['head.bias'] = torch.nn.Parameter(torch.randn(config.MODELNUM_CLASSES))
修改完如下所示
三、训练
1.Train
python -m torch.distributed.launch --nproc_per_node <num-of-gpus-to-use> --master_port 12345 main.py \
--cfg <config-file> --data-path <imagenet-path> [--batch-size <batch-size-per-gpu> --output <output-directory> --tag <job-tag>]
For example, to train Swin Transformer with 8 GPU on a single node for 300 epochs, run:
- Swin-T:
python -m torch.distributed.launch --nproc_per_node 8 --master_port 12345 main.py \
--cfg configs/swin/swin_tiny_patch4_window7_224.yaml --data-path <imagenet-path> --batch-size 128
- Swin-S:
python -m torch.distributed.launch --nproc_per_node 8 --master_port 12345 main.py \
--cfg configs/swin/swin_small_patch4_window7_224.yaml --data-path <imagenet-path> --batch-size 128
- Swin-B:
python -m torch.distributed.launch --nproc_per_node 8 --master_port 12345 main.py \
--cfg configs/swin/swin_base_patch4_window7_224.yaml --data-path <imagenet-path> --batch-size 64 \
--accumulation-steps 2 [--use-checkpoint]
2.Evaluation
python -m torch.distributed.launch --nproc_per_node 1 --master_port 12345 main.py --eval \
--cfg configs/swin/swin_base_patch4_window7_224.yaml --resume swin_base_patch4_window7_224.pth --data-path <imagenet-path>
nproc_per_node是GPU数量
config-file 是配置文件,在configs里
四、常见报错
1.TypeError: init() got an unexpected keyword argument ‘t_mul‘
删除Swin-Transformer/lr_scheduler.py的第24行‘t_mul=1.,’
标签:Transformer,Swin,--,torch,python,swin,ICCV,py From: https://blog.csdn.net/weixin_62371528/article/details/137112837