Jingchu Gai

@Jingchug

PhD, CMU Machine Learning Department | Peking University B.S Math.

Pittsburgh

Jingchu Gai
@Jingchug
Jul 23
Even an ordinary graduate of Peking University's School of Mathematical Sciences would swell with pride on hearing that two alumni had won the Fields Medal! 即使是北大数院的一名普通毕业生，在听到两个校友获得菲尔兹奖的新闻时，也会不由自主地挺起胸膛！
Peking University
@PKU1898
Jul 23
Huge congratulations to PKU alumni Wang Hong and Deng Yu, recipients of the 2026 Fields Medal — mathematics’ highest honor! 🧮 Announced at the 2026 International Congress of Mathematicians (ICM) in Philadelphia, the pair are among four mathematicians worldwide to claim this
Jingchu Gai
@Jingchug
May 29
1/6New paper! 🧵 We find that LLMs often commit to an answer BEFORE they finish reasoning — the rest of the CoT is just post-hoc rationalization. We call this "premature confidence." 📄 arxiv.org/abs/2605.24396
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Jingchu Gai
@Jingchug
Feb 3
1/n Can LLMs solve research-level math problems? 🧠 While they’ve excelled in math contests, open conjectures are a different beast. In our latest paper, we use LLMs to tackle a problem that has remained stagnant for over 30 years. 🧵👇
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Jingchu Gai
@Jingchug
Dec 18, 2025
1/ RL post-training boosts Pass@1 but often causes Diversity Collapse, dropping Pass@K below the Base Model. 📉 Introducing Differential Smoothing: a reward tweak that fixes this without trade-offs. 🚀 Results: • +6.7% gains • Consistently improves BOTH Pass@1 & Pass@K.
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