Create README.md

README.md

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+## Dataset Description
+
+OpenImage-O is an OOD benchmark subset derived from Open Images dataset.
+
+- **Homepage:** https://storage.googleapis.com/openimages/web/index.html
+## Citation
+```bibtex
+@article{kuznetsova2020open,
+  title={The open images dataset v4: Unified image classification, object detection, and visual relationship detection at scale},
+  author={Kuznetsova, Alina and Rom, Hassan and Alldrin, Neil and Uijlings, Jasper and Krasin, Ivan and Pont-Tuset, Jordi and Kamali, Shahab and Popov, Stefan and Malloci, Matteo and Kolesnikov, Alexander and others},
+  journal={International journal of computer vision},
+  volume={128},
+  number={7},
+  pages={1956--1981},
+  year={2020},
+  publisher={Springer}
+}