add ltu-as paper

README.md

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 <p align="center"><img src="https://github.com/YuanGongND/ltu/blob/main/usage.gif?raw=true" alt="Illustration of CAV-MAE." width="900"/></p>
 
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 **LTU-AS (Second Generation):**
 
 *LTU-AS was accepted at ASRU 2023. See you in Taipei!*
 
 **[[Paper]](https://arxiv.org/pdf/2309.14405.pdf)** **[[HuggingFace Space]](https://huggingface.co/spaces/yuangongfdu/ltu-2)** **[[ASRU Peer Review]](https://github.com/YuanGongND/ltu/tree/main/asru_review)**
 
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 **LTU (First Generation):**
 
 **[[Paper]](https://arxiv.org/abs/2305.10790)**  **[[Interactive Demo]](https://18c618fc8f07ec494e.gradio.live)**
 
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 **Authors:** [Yuan Gong](https://yuangongnd.github.io/), [Hongyin Luo](https://luohongyin.github.io/), [Alexander H. Liu](https://alexander-h-liu.github.io/), [Leonid Karlinsky](https://mitibmwatsonailab.mit.edu/people/leonid-karlinsky/), and [James Glass](https://people.csail.mit.edu/jrg/) (MIT & MIT-IBM Watson AI Lab)
 
 **Abstract:**