Windows support in OpenFL tutorials

[Maxime-Perret]

Hello,

I've been experimenting with OpenFL trying to run different tutorials. Since supporting Windows was mentioned in #525, I am personally using Windows 11 Pro and ran into two problems which I believe are OS related in the different tutorials.

• For DataLoader, having num_workers any larger than 0 causes an issue as such. Thus, for Windows users, having num_workers = 0 would be necessary. As far as I know, out of the interactive api folder, this concerns the tutorials Dogs vs Cats, Histology, Histology FedCurv, Kvasir UNet, Lightning MNIST GAN, MVTec PatchSVDD, Market Re-ID, MedMNIST 2D, MedMNIST 3D.

• Some of the arguments in the plans of the tutorials (in workspace/plan/plan.yaml) contain !!, like for example criterion: !!python/object:torch.nn.modules.loss.CrossEntropyLoss. When parsing the plan in federated/plan/plan.py, line 42 uses safe_load which together causes an issue could not determine a constructor for the tag. Using the fix suggested here, I got it to work by replacing safe_load(yaml_path.read_text()) by load(yaml_path.read_text(), Loader=yaml.Loader).

Best

Edit: Updated my post and removed personal issues after fixing some of my problems with a clean reinstall of Python+Anaconda, and created issue #549 from what is left, so I guess it is more appropriate following up on the issue page.