Update index.md

Author: callmespring

index.md

@@ -44,7 +44,7 @@ My email <c.shi7@lse.ac.uk>. My [GitHub](https://github.com/callmespring).
 ### Research
 
 My research is motivated from the following applications: 
-* **LLMs**
+* **LLMs**: 
   - Fine-tuning: [DRPO](https://arxiv.org/pdf/2506.01183), [VRPO](https://arxiv.org/pdf/2504.03784),  [slides](https://callmespring.github.io/slides/DRPO.pdf), [talk](https://www.bilibili.com/video/BV1xNuuzVEeD?spm_id_from=333.788.videopod.sections&vd_source=0ff25cf8645aa63231bec2428b94bf6f&p=3);
   - Passive detection: [AdadetectGPT](https://arxiv.org/pdf/2510.01268), [talk](https://www.bilibili.com/video/BV1S7K9zwEgU/?spm_id_from=333.337.search-card.all.click);
 * **Ridesharing** (see our AAAI tutorial ([Youtube](https://www.youtube.com/watch?v=LwShOYaRFqM&list=PLA_E7IjY9cw4aC4T8pnV3vl9wSA1461KV), [Bilibili](https://www.bilibili.com/video/BV1ZS9NYpEHg/?spm_id_from=333.788.recommend_more_video.-1&vd_source=0ff25cf8645aa63231bec2428b94bf6f