Which weights file should I use when I choose the cfg yolov3-tiny.cfg?@Samjith888 your command automatically loads the ultralytics49.pt backbone, which requires yolov3-spp.cfg. You must remove the backbone by using --weights '', or specify a weights-cfg combination that is compatible.

[Suncheng2019]

I want to add attention se in yolov3-tiny.cfg, but I don't have a compatible weights. Thank you!
@Samjith888 your command automatically loads the ultralytics49.pt backbone, which requires yolov3-spp.cfg. You must remove the backbone by using --weights '', or specify a weights-cfg combination that is compatible.

This error is caused by a user supplying incompatible --weights and --cfg arguments. To solve this you must specify no weights (i.e. random initialization of the model) using --weights '' and any --cfg, or use a --cfg that is compatible with your --weights. If none are specified, the defaults are --weights ultralytics49.pt and --cfg cfg/yolov3-spp.cfg.

Compatible --weights --cfg combinations:

python3 train.py --weights yolov3.pt --cfg cfg/yolov3.cfg
python3 train.py --weights yolov3.weights --cfg cfg/yolov3.cfg
python3 train.py --weights yolov3-spp.pt --cfg cfg/yolov3-spp.cfg
python3 train.py --weights ultralytics49.pt --cfg cfg/yolov3-spp.cfg
python3 train.py --weights ultralytics68.pt --cfg cfg/yolov3-spp.cfg

To train from scratch (randomly initialized weights), use:

python3 train.py --weights '' --cfg cfg/*.cfg  # any cfg will work here

ultralytics49.pt is currently the highest performing YOLOv3 model (trained from scratch using this repo) available at the default img-size of 416 (see #310), which is the reason it is used as the default backbone.

Originally posted by @glenn-jocher in #657 (comment)

[xiaomahencai]

but when I use the command python train.py --weights '' --cfg cfg/yolov3-tiny.cfg,also error as follow:
KeyError: "weights/yolov3-tiny.pt is not compatible with cfg/yolov3-tiny.cfg. Specify --weights '' or specify a --cfg compatible with weights/yolov3-tiny.pt. See #657"

[xiaomahencai]

I also have an error,when I run the command python train.py --weights yolov3.pt --cfg cfg/yolov3.cfg,error as follow:yolov3.pt is missing,please downloading http:....,but!the file had just been downloaded!!!please help me!!!thank you!!!

[github-actions]

This issue has been automatically marked as stale because it has not had recent activity. It will be closed if no further activity occurs. Thank you for your contributions.

[glenn-jocher]

@xiaomahencai i understand your frustration. It seems you're encountering compatibility issues between the weights and the configuration file. When using YOLOv3, it's essential to ensure that your specified weights are compatible with the chosen configuration file.

For yolov3-tiny.cfg, it is critical to specify compatible weights. The ultralytics49.pt backbone, which is used by default, requires the yolov3-spp.cfg configuration file.

To resolve the issue, you can specify no weights using --weights '' and use cfg/yolov3-tiny.cfg. Alternatively, you can choose a compatible --weights option for yolov3-tiny.cfg or specify a --cfg that matches your selected --weights configuration.

If you encounter issues with yolov3.pt not being recognized even after it's been downloaded, please ensure that the file is located in the correct directory specified in the command or verify the file's integrity.

If you need further assistance or have more questions, feel free to ask!

Remember, your contributions to the YOLO community are greatly appreciated. Thank you!