Update README.md

README.md

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 <h3 align="center">Hierarchical Autoregressive Video Generation with Pipelined Parallel Inference</h3>
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-  <h3 align="center"><a href="https://arxiv.org/abs/PLACEHOLDER">arXiv</a> | <a href="https://jacky-hate.github.io/HiAR/">Website</a> | <a href="https://github.com/Jacky-hate/HiAR">Code</a> | <a href="https://huggingface.co/jackyhate/HiAR/tree/main">Model</a></h3>
+  <h3 align="center"><a href="https://arxiv.org/abs/2603.08703">arXiv</a> | <a href="https://jacky-hate.github.io/HiAR/">Website</a> | <a href="https://github.com/Jacky-hate/HiAR">Code</a> | <a href="https://huggingface.co/jackyhate/HiAR/tree/main">Model</a></h3>
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