Implement Krea2Transformer2DModel and Krea2Pipeline for text-to-image generation with the Krea 2 architecture.

Implement Krea2Transformer2DModel and Krea2Pipeline for text-to-image generation with the Krea 2 architecture.: a task in HF ML Tasksmith (Harbor dataset). Krea2Transformer2DModel — a single-stream MMDiT with: - Inputs: packed image latents (B, image seq len, in channels) and stacked text encoder…