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GeezerVison is showing zoeyli.com — Zoey Li’s Personal Webpage About MeHi! I’m Zoey. I work at Amazon SFAI developing the language model behind the Rufus assistant. I graduated as a Computer Science PhD from UIUC in 2024 advised by Prof. Jiawei Han. I’m very fortunate to be part of two generous families: the Data Mining Group and the BLENDER lab. These days I work on RL post-training for language models, from the algorithms to the training infrastructure behind them. In 2024–2025 I focused on data selection and scaling laws for pretraining. During my PhD I built semi-supervised and weakly supervised methods for information extraction (pre-GPT), then moved to knowledge editing and hallucination mitigation. Recent WritingLatestOptimizing Pass@k as Reweighting Prompts· 28 min read · RLVR In progress Pass@k upweights hard problems. Training on pass@k applies that weight directly, which raises two questions: what the weight should be, and where in the training loop to apply it. SeriesOff-policy correctionsWhere the policy that samples rollouts and the policy being trained come apart in LLM RL, and when a correction is worth it.
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