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Xiaofei Sun

18 accepted papers

2026

CUDA-L1: Improving CUDA Optimization via Contrastive Reinforcement Learning

ICLR 2026poster

The exponential growth in demand for GPU computing resources has created an urgent need for automated CUDA optimization strategies. While recent advances in LLMs show promise for code generation, current state-of-the-art models achieve low success rates in improving CUDA speed. In this paper, we in…

Cited by 0SourcecodeScholar
2025

DrDiff: Dynamic Routing Diffusion with Hierarchical Attention for Breaking the Efficiency-Quality Trade-off

EMNLP 2025

This paper introduces DrDiff, a novel framework for long-text generation that overcomes the efficiency-quality trade-off through three core technologies. First, we design a dynamic expert scheduling mechanism that intelligently allocates computational resources during the diffusion process based on

Cited by 0SourcePDFScholar
2025

GPT-NER: Named Entity Recognition via Large Language Models

NAACL 2025findings

Despite the fact that large-scale Language Models (LLM) have achieved SOTA performances on a variety of NLP tasks, its performance on NER is still significantly below supervised baselines. This is due to the gap between the two tasks the NER and LLMs: the former is a sequence labeling task in nature…

2025

OSC: Cognitive Orchestration through Dynamic Knowledge Alignment in Multi-Agent LLM Collaboration

EMNLP 2025

This paper introduces OSC (Orchestrating Cognitive Synergy), a knowledge-aware adaptive collaboration framework designed to enhance cognitive synergy in multi-agent systems with large language models. While prior work has advanced agent selection and result aggregation, efficient linguistic interact

2023

Defending against Backdoor Attacks in Natural Language Generation

AAAI 2023technical

The frustratingly fragile nature of neural network models make current natural language generation (NLG) systems prone to backdoor attacks and generate malicious sequences that could be sexist or offensive. Unfortunately, little effort has been invested to how backdoor attacks can affect current NL…

2023

Text Classification via Large Language Models

EMNLP 2023long findings

Despite the remarkable success of large-scale Language Models (LLMs) such as GPT-3, their performances still significantly underperform fine-tuned models in the task of text classification.This is due to (1) the lack of reasoning ability in addressing complex linguistic phenomena (e.g., intensif…

Cited by 0SourcecodeScholar
2022

An MRC Framework for Semantic Role Labeling

COLING 2022main

Semantic Role Labeling (SRL) aims at recognizing the predicate-argument structure of a sentence and can be decomposed into two subtasks: predicate disambiguation and argument labeling. Prior work deals with these two tasks independently, which ignores the semantic connection between the two tasks. I…

2022

BadPre: Task-agnostic Backdoor Attacks to Pre-trained NLP Foundation Models

ICLR 2022poster

Pre-trained Natural Language Processing (NLP) models, which can be adapted to a variety of downstream language tasks via fine-tuning, highly accelerate the learning progress of NLP models. However, NLP models have been shown to be vulnerable to backdoor attacks. Previous NLP backdoor attacks mainly…

Cited by 125SourcePDFScholar
2022

Dependency Parsing as MRC-based Span-Span Prediction

ACL 2022long

Higher-order methods for dependency parsing can partially but not fully address the issue that edges in dependency trees should be constructed at the text span/subtree level rather than word level. In this paper, we propose a new method for dependency parsing to address this issue. The proposed meth…

2022

Fast Nearest Neighbor Machine Translation

ACL 2022findings

Though nearest neighbor Machine Translation (kNN-MT) (CITATION) has proved to introduce significant performance boosts over standard neural MT systems, it is prohibitively slow since it uses the entire reference corpus as the datastore for the nearest neighbor search. This means each step for each b…

2022

GNN-LM: Language Modeling based on Global Contexts via GNN

ICLR 2022spotlight

Inspired by the notion that "it to copy is easier than to memorize", in this work, we introduce GNN-LM, which extends vanilla neural language model (LM) by allowing to reference similar contexts in the entire training corpus. We build a directed heterogeneous graph between an input context and its s…

2022

Paraphrase Generation as Unsupervised Machine Translation

COLING 2022main

In this paper, we propose a new paradigm for paraphrase generation by treating the task as unsupervised machine translation (UMT) based on the assumption that there must be pairs of sentences expressing the same meaning in a large-scale unlabeled monolingual corpus. The proposed paradigm first split…

Cited by 5SourcePDFScholar
2022

Summarize, Outline, and Elaborate: Long-Text Generation via Hierarchical Supervision from Extractive Summaries

COLING 2022main

The difficulty of generating coherent long texts lies in the fact that existing models overwhelmingly focus on the tasks of local word prediction, and cannot make high level plans on what to generate or capture the high-level discourse dependencies between chunks of texts. Inspired by how humans wri…

Cited by 23SourcePDFScholar
2021

ChineseBERT: Chinese Pretraining Enhanced by Glyph and Pinyin Information

ACL 2021long

Recent pretraining models in Chinese neglect two important aspects specific to the Chinese language: glyph and pinyin, which carry significant syntax and semantic information for language understanding. In this work, we propose ChineseBERT, which incorporates both the glyph and pinyin information of…

2021

ConRPG: Paraphrase Generation using Contexts as Regularizer

EMNLP 2021main

A long-standing issue with paraphrase generation is the lack of reliable supervision signals. In this paper, we propose a new unsupervised paradigm for paraphrase generation based on the assumption that the probabilities of generating two sentences with the same meaning given the same context should…

Cited by 26SourcePDFScholar
2021

Layer-wise Model Pruning based on Mutual Information

EMNLP 2021main

Inspired by mutual information (MI) based feature selection in SVMs and logistic regression, in this paper, we propose MI-based layer-wise pruning: for each layer of a multi-layer neural network, neurons with higher values of MI with respect to preserved neurons in the upper layer are preserved. Sta…

Cited by 23SourcePDFScholar
2021

kFolden: k-Fold Ensemble for Out-Of-Distribution Detection

EMNLP 2021main

Out-of-Distribution (OOD) detection is an important problem in natural language processing (NLP). In this work, we propose a simple yet effective framework kFolden, which mimics the behaviors of OOD detection during training without the use of any external data. For a task with k training labels, kF…

2019

Glyce: Glyph-vectors for Chinese Character Representations

NeurIPS 2019poster

It is intuitive that NLP tasks for logographic languages like Chinese should benefit from the use of the glyph information in those languages. However, due to the lack of rich pictographic evidence in glyphs and the weak generalization ability of standard computer vision models on character data, a…