Lumina-next: Making Lumina-t2x Stronger And Faster With Next-dit

Zhuo Le, Du Ruoyi, Xiao Han, Li Yangguang, Liu Dongyang, Huang Rongjie, Liu Wenze, Zhao Lirui, Wang Fu-yun, Ma Zhanyu, Luo Xu, Wang Zehan, Zhang Kaipeng, Zhu Xiangyang, Liu Si, Yue Xiangyu, Liu Dingning, Ouyang Wanli, Liu Ziwei, Qiao Yu, Li Hongsheng, Gao Peng. Arxiv 2024

[Paper]    
Efficiency And Optimization Merging Model Architecture Pretraining Methods Tools Training Techniques Transformer

Lumina-T2X is a nascent family of Flow-based Large Diffusion Transformers that establishes a unified framework for transforming noise into various modalities, such as images and videos, conditioned on text instructions. Despite its promising capabilities, Lumina-T2X still encounters challenges including training instability, slow inference, and extrapolation artifacts. In this paper, we present Lumina-Next, an improved version of Lumina-T2X, showcasing stronger generation performance with increased training and inference efficiency. We begin with a comprehensive analysis of the Flag-DiT architecture and identify several suboptimal components, which we address by introducing the Next-DiT architecture with 3D RoPE and sandwich normalizations. To enable better resolution extrapolation, we thoroughly compare different context extrapolation methods applied to text-to-image generation with 3D RoPE, and propose Frequency- and Time-Aware Scaled RoPE tailored for diffusion transformers. Additionally, we introduced a sigmoid time discretization schedule to reduce sampling steps in solving the Flow ODE and the Context Drop method to merge redundant visual tokens for faster network evaluation, effectively boosting the overall sampling speed. Thanks to these improvements, Lumina-Next not only improves the quality and efficiency of basic text-to-image generation but also demonstrates superior resolution extrapolation capabilities and multilingual generation using decoder-based LLMs as the text encoder, all in a zero-shot manner. To further validate Lumina-Next as a versatile generative framework, we instantiate it on diverse tasks including visual recognition, multi-view, audio, music, and point cloud generation, showcasing strong performance across these domains. By releasing all codes and model weights, we aim to advance the development of next-generation generative AI capable of universal modeling.

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