Add bibtex to decoding-regression

PiperOrigin-RevId: 723276248

Author: xingyousong

optformer/decoding_regression/README.md

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+# Decoding-based Regression
+This folder contains basic keras code implementing the numeric decoder head.
+
+## Citation
+If you found this codebase useful, please consider citing our paper. Thanks!
+
+```bibtex
+@article{decoding_regression,
+      author={Xingyou Song and Dara Bahri},
+      year={2025},
+      eprint={2501.19383},
+      archivePrefix={arXiv},
+      primaryClass={cs.LG},
+      url={https://arxiv.org/abs/2501.19383},
+}
+```