Unveil Inversion and Invariance in Flow Transformer for Versatile Image Editing FTEdit: Tuning-free image editing based on Flow Transformer Pengcheng Xu | Boyuan Jiang | Xiaobin Hu | Donghao Luo | Qingdong He | Jiangning Zhang | Chengjie Wang | Yunsheng Wu | Charles Ling | Boyu Wang Western University Tencent