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Zhenhua Liu

16 accepted papers

2026

Response Attack: Exploiting Contextual Priming to Jailbreak Large Language Models

AAAI 2026technical

Contextual priming, where earlier stimuli covertly bias later judgments, offers an unexplored attack surface for large language models (LLMs). We uncover a contextual priming vulnerability in which the previous response in the dialogue can steer its subsequent behavior toward policy-violating conten

Cited by 0SourcePDFScholar
2025

Learning to Refuse: Towards Mitigating Privacy Risks in LLMs

COLING 2025main

Large language models (LLMs) exhibit remarkable capabilities in understanding and generating natural language. However, these models can inadvertently memorize private information, posing significant privacy risks. This study addresses the challenge of enabling LLMs to protect specific individuals’…

2025

UAQFact: Evaluating Factual Knowledge Utilization of LLMs on Unanswerable Questions

ACL 2025finding

Handling unanswerable questions (UAQ) is crucial for LLMs, as it helps prevent misleading responses in complex situations. While previous studies have built several datasets to assess LLMs’ performance on UAQ, these datasets lack factual knowledge support, which limits the evaluation of LLMs’ abilit…

2024

DiffusionDialog: A Diffusion Model for Diverse Dialog Generation with Latent Space

COLING 2024main

In real-life conversations, the content is diverse, and there exist one-to-many problems that require diverse generation. Previous studies attempted to introduce discrete or Gaussian-based latent variables to address the one-to-many problem, but the diversity is limited. Recently, diffusion models h…

Cited by 3SourcePDFScholar
2024

Kangaroo: Lossless Self-Speculative Decoding for Accelerating LLMs via Double Early Exiting

NeurIPS 2024poster

Speculative decoding has demonstrated its effectiveness in accelerating the inference of large language models (LLMs) while maintaining an identical sampling distribution. However, the conventional approach of training separate draft model to achieve a satisfactory token acceptance rate can be costl…

2024

Probing Language Models for Pre-training Data Detection

ACL 2024long

Large Language Models (LLMs) have shown their impressive capabilities, while also raising concerns about the data contamination problems due to privacy issues and leakage of benchmark datasets in the pre-training phase. Therefore, it is vital to detect the contamination by checking whether an LLM ha…

2023

Applied Online Algorithms with Heterogeneous Predictors

ICML 2023poster

For many application domains, the integration of machine learning (ML) models into decision making is hindered by the poor explainability and theoretical guarantees of black box models. Although the emerging area of algorithms with predictions offers a way to leverage ML while enjoying worst-case gu…

Cited by 7SourcePDFScholar
2023

Diffusion-Based 3D Human Pose Estimation with Multi-Hypothesis Aggregation

ICCV 2023poster

In this paper, a novel Diffusion-based 3D Pose estimation (D3DP) method with Joint-wise reProjection-based Multi-hypothesis Aggregation (JPMA) is proposed for probabilistic 3D human pose estimation. On the one hand, D3DP generates multiple possible 3D pose hypotheses for a single 2D observation. It…

Cited by 125PDFcodeScholar
2022

P-STMO: Pre-trained Spatial Temporal Many-to-One Model for 3D Human Pose Estimation

ECCV 2022poster

"This paper introduces a novel Pre-trained Spatial Temporal Many-to-One (P-STMO) model for 2D-to-3D human pose estimation task. To reduce the difficulty of capturing spatial and temporal information, we divide this task into two stages: pre-training (Stage I) and fine-tuning (Stage II). In Stage I,…

2022

Tencent-MVSE: A Large-Scale Benchmark Dataset for Multi-Modal Video Similarity Evaluation

CVPR 2022poster

Multi-modal video similarity evaluation is important for video recommendation systems such as video de-duplication, relevance matching, ranking, and diversity control. However, there still lacks a benchmark dataset that can support supervised training and accurate evaluation. In this paper, we propo…

Cited by 8PDFcodeScholar
2021

Evolutionary Quantization of Neural Networks with Mixed-Precision

ICASSP 2021accepted

Quantization is an effective way for reducing the memory and computation costs of deep neural networks. Most of existing methods exploit the fixed-precision quantization approach, e.g., weights and activations (i.e., output features) are represented as 8-bit values. Although mixed-precision quantiza…

Cited by 0SourceScholar
2021

Post-Training Quantization for Vision Transformer

NeurIPS 2021poster

Recently, transformer has achieved remarkable performance on a variety of computer vision applications. Compared with mainstream convolutional neural networks, vision transformers are often of sophisticated architectures for extracting powerful feature representations, which are more difficult to be…

Cited by 416SourcePDFScholar
2021

Pre-Trained Image Processing Transformer

CVPR 2021poster

As the computing power of modern hardware is increasing strongly, pre-trained deep learning models (e.g., BERT, GPT-3) learned on large-scale datasets have shown their effectiveness over conventional methods. The big progress is mainly contributed to the representation ability of transformer and its…

Cited by 2279PDFcodeScholar
2018

Frequency-Domain Dynamic Pruning for Convolutional Neural Networks

NeurIPS 2018poster

Deep convolutional neural networks have demonstrated their powerfulness in a variety of applications. However, the storage and computational requirements have largely restricted their further extensions on mobile devices. Recently, pruning of unimportant parameters has been used for both network com…

Cited by 200SourcePDFScholar