← Search

Deren Lei

2 accepted papers

2025

FactCG: Enhancing Fact Checkers with Graph-Based Multi-Hop Data

NAACL 2025long

Prior research on training grounded factuality classification models to detect hallucinations in large language models (LLMs) has relied on public natural language inference (NLI) data and synthetic data. However, conventional NLI datasets are not well-suited for document-level reasoning, which is c…

2021

Extract, Denoise and Enforce: Evaluating and Improving Concept Preservation for Text-to-Text Generation

EMNLP 2021main

Prior studies on text-to-text generation typically assume that the model could figure out what to attend to in the input and what to include in the output via seq2seq learning, with only the parallel training data and no additional guidance. However, it remains unclear whether current models can pre…