ConvNeXt V2 Seems to Work! (Task 1)

 After some experimentation, fine-tuning ConvNeXt V2 Tiny seems to be the way to go for Test I. Setting up the custom dataset loader, handling the 1-channel to 3-channel conversion, applying ImageNet normalization... It's training! Watching the validation AUC climb is oddly satisfying. Need to calculate the ROC/AUC properly for the report.

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