@article{
liu2026morph,
title={{MORPH}: Generative Retrieval via Diffusion Transformer with Metric-Ordered Sequence Training and Hybrid-Policy Preference Optimization},
author={Chenghao Liu and Yu Zhang and Zhongtao Jiang and Kun Xu and Zhenwei An and Renzhi Wang and Zhao Wang and Jiachen Zhang and YUXIAO ZHANG and Kun Xu and Songfang Huang},
journal={Transactions on Machine Learning Research},
issn={2835-8856},
year={2026},
url={https://openreview.net/forum?id=aUX1pxM5lF},
note={}
}