Add cpu only option instead of gpu option.

README.md

@@ -24,7 +24,7 @@ options:
                         Prediction threshold (default is 0.35)
   --ext EXT             Extension to add to caption file in case of dir option (default is .txt)
   --overwrite           Overwrite the file if it exists
-  --gpu                 Use GPU (Compatible CUDA and cuDNN required)
+  --cpu                 Use CPU only
   --model {wd14-vit.v1,wd14-vit.v2,wd14-convnext.v1,wd14-convnext.v2,wd14-convnextv2.v1,wd14-swinv2-v1,wd-v1-4-moat-tagger.v2,mld-caformer.dec-5-97527,mld-tresnetd.6-30000}
                         modelname to use for prediction (default is wd14-convnextv2.v1)
 ```
@@ -63,9 +63,5 @@ Requires CUDA 12.2 and cuDNN8.x.
 pip install onnxruntime-gpu --extra-index-url https://aiinfra.pkgs.visualstudio.com/PublicPackages/_packaging/onnxruntime-cuda-12/pypi/simple/
 ```
 
-```
-python run.py --file image.jpg --gpu
-```
-
 https://onnxruntime.ai/docs/install/
 https://onnxruntime.ai/docs/execution-providers/CUDA-ExecutionProvider.html#requirements