Cannot compute loss function from best model about yolov3

[glenn-jocher]

@useruser2023 hello! Thanks for reaching out and for your efforts in searching for a solution before posting your issue.

The error you're encountering, AttributeError: 'DetectionModel' object has no attribute 'hyp', suggests that the model object you're trying to use does not have the hyperparameters (hyp) attribute that the ComputeLoss function expects.

The ComputeLoss function requires the model's hyperparameters to calculate the loss. When you load the model using YOLO("best.pt"), it does not automatically load the hyperparameters used during training.

To resolve this, you should ensure that the hyperparameters are correctly loaded and associated with your model object. Typically, these hyperparameters are stored in a .yaml file or within the training script. Make sure to load these hyperparameters and pass them to the ComputeLoss function or the model object as required.

For further guidance on how to properly set up the loss computation for validation, please refer to the Ultralytics Docs, which provide comprehensive information on using the YOLOv3 repository.

If you continue to face issues, please provide more details about how you're loading the model and where the hyperparameters are defined, and we'll be happy to help you further. Remember, the community and the Ultralytics team are here to support you! 😊