Papers by Fangyuan Xu
SAGE: Steerable Agentic Data Generation for Deep Search with Execution Feedback (2026.findings-eacl)
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Fangyuan Xu, Rujun Han, Yanfei Chen, Zifeng Wang, I-Hung Hsu, Jun Yan, Vishy Tirumalashetty, Eunsol Choi, Tomas Pfister, Chen-Yu Lee
| Challenge: | High-quality, complex question-answer pairs are pivotal for training and evaluating capable deep search agents. |
| Approach: | They propose a pipeline that generates high-quality, difficulty-controlled deep search question-answer pairs for a given corpus and a target difficulty level. |
| Outcome: | The proposed pipeline generates high-quality, difficulty-controlled deep search question-answer pairs for a given corpus and a target difficulty level. |
RefreshKV: Updating Small KV Cache During Long-form Generation (2025.acl-long)
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| Challenge: | Existing methods for generating long sequences of tokens are expensive and require memory and computation resources. |
| Approach: | They propose a method that alternates between full context attention and attention over a subset of input tokens during generation. |
| Outcome: | The proposed method achieves comparable speedup to eviction-based methods while improving performance for various long-form generation tasks. |
How Do We Answer Complex Questions: Discourse Structure of Long-form Answers (2022.acl-long)
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| Challenge: | Recent work explored long-form answers, where answers are free-form texts consisting of multiple sentences. |
| Approach: | They develop an ontology of six sentence-level functional roles for long-form answers . they annotate 3.9k sentences in 640 answer paragraphs and train a strong classifier . |
| Outcome: | The proposed model-generated answers agree less with model-driven answers than human-written answers. |
Concise Answers to Complex Questions: Summarization of Long-form Answers (2023.acl-long)
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| Challenge: | Long-form question answering systems provide rich information by presenting paragraph-level answers, but not all information is required to answer the question. |
| Approach: | They propose an extract-and-decontextualize approach to summarize long-form answers using state-of-the-art models. |
| Outcome: | The proposed extract-and-decontextualize approach improves the quality of the extractive summary, exemplifying its potential in the summarization task. |
Rose-SQL: Role-State Evolution Guided Structured Reasoning for Multi-Turn Text-to-SQL (2026.acl-long)
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| Challenge: | Existing approaches to multi-turn Text-to-SQL tasks rely on unstable APIs or expensive fine-tuning. |
| Approach: | They propose a training-free framework that leverages small-scale LRMs through in-context learning to enable accurate context-dependent parsing. |
| Outcome: | The proposed framework outperforms in-context learning baselines at the 4B scale and surpasses state-of-the-art models at the 8B and 14B scales. |
A Critical Evaluation of Evaluations for Long-form Question Answering (2023.acl-long)
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| Challenge: | Long-form question answering (LFQA) is an emerging research area within QA . however, its flexibility poses enormous challenges for evaluation . |
| Approach: | They conduct the first targeted study of the evaluation of long-form answers, covering both human and automatic evaluation practices. |
| Outcome: | The proposed evaluations cover human and automatic evaluations. |
KIWI: A Dataset of Knowledge-Intensive Writing Instructions for Answering Research Questions (2024.findings-acl)
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| Challenge: | Large language models (LLMs) are increasingly used as conversational agents. |
| Approach: | They construct a dataset of knowledge-intensive writing instructions to evaluate LLMs' ability to follow user instructions. |
| Outcome: | The proposed model fails to integrate new information into an existing answer and perform precise and unambiguous edits. |
Modeling Exemplification in Long-form Question Answering via Retrieval (2022.naacl-main)
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| Challenge: | Exemplification is a process by which writers explain or clarify a concept by providing an example. |
| Approach: | They propose to use a partially-written answer to query a large set of human-written examples extracted from a corpus to determine exemplification quality. |
| Outcome: | The proposed model is able to retrieve human-written examples from a corpus and show that it is more relevant than state-of-the-art models. |