Alexander Eichhorn 65efc3db7d Feature: Add Z-Image-Turbo regional guidance (#8672) ... * feat: Add Regional Guidance support for Z-Image model Implements regional prompting for Z-Image (S3-DiT Transformer) allowing different prompts to affect different image regions using attention masks. Backend changes: - Add ZImageRegionalPromptingExtension for mask preparation - Add ZImageTextConditioning and ZImageRegionalTextConditioning data classes - Patch transformer forward to inject 4D regional attention masks - Use additive float mask (0.0 attend, -inf block) in bfloat16 for compatibility - Alternate regional/full attention layers for global coherence Frontend changes: - Update buildZImageGraph to support regional conditioning collectors - Update addRegions to create z_image_text_encoder nodes for regions - Update addZImageLoRAs to handle optional negCond when guidance_scale=0 - Add Z-Image validation (no IP adapters, no autoNegative) * @Pfannkuchensack Fix windows path again * ruff check fix * ruff formating * fix(ui): Z-Image CFG guidance_scale check uses > 1 instead of > 0 Changed the guidance_scale check from > 0 to > 1 for Z-Image models. Since Z-Image uses guidance_scale=1.0 as "no CFG" (matching FLUX convention), negative conditioning should only be created when guidance_scale > 1. --------- Co-authored-by: Lincoln Stein <lincoln.stein@gmail.com>		2025-12-26 02:25:38 +00:00
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web	Feature: Add Z-Image-Turbo regional guidance (#8672)	2025-12-26 02:25:38 +00:00
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