Indigo

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Implement validation loss using FID scores and add corresponding documentation

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# Description This pull request introduces the implementation of validation loss using FID (Fréchet Inception Distance) scores and provides comprehensive documentation for this feature (for the wiki). The implementation includes:...

Previously, the prepare_mask function used a simple grayscale conversion (mask.convert("L")), which discarded the alpha channel in RGBA images. This resulted in fully transparent pixels being rendered as white, causing them...