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Yapei Chang

6 accepted papers

2026

How2Everything: Mining the Web for How-to Procedures to Evaluate and Improve LLMs

ICML 2026poster

Generating step-by-step "how-to" procedures is a key LLM capability: how-to advice is commonly requested in chatbots, and step-by-step planning is critical for reasoning over complex tasks. Yet, measuring and improving procedural validity at scale on real-world tasks remains challenging and understu…

Cited by 0SourceScholar
2025

BLEUBERI: BLEU is a surprisingly effective reward for instruction following

NeurIPS 2025poster

Reward models are central to aligning LLMs with human preferences, but they are costly to train, requiring large-scale human-labeled preference data and powerful pretrained LLM backbones. Meanwhile, the increasing availability of high-quality synthetic instruction-following datasets raises the quest…

Cited by 0SourcecodeScholar
2024

BooookScore: A systematic exploration of book-length summarization in the era of LLMs

ICLR 2024oral

Summarizing book-length documents ($>$100K tokens) that exceed the context window size of large language models (LLMs) requires first breaking the input document into smaller chunks and then prompting an LLM to merge, update, and compress chunk-level summaries. Despite the complexity and importance…

2024

PostMark: A Robust Blackbox Watermark for Large Language Models

EMNLP 2024main

The most effective techniques to detect LLM-generated text rely on inserting a detectable signature—or watermark—during the model’s decoding process. Most existing watermarking methods require access to the underlying LLM’s logits, which LLM API providers are loath to share due to fears of model dis…

2022

RankGen: Improving Text Generation with Large Ranking Models

EMNLP 2022main

Given an input sequence (or prefix), modern language models often assign high probabilities to output sequences that are repetitive, incoherent, or irrelevant to the prefix; as such, model-generated text also contains such artifacts. To address these issues we present RankGen, a 1.2B parameter encod…