Search Results for author: Zhiming Zheng

Found 19 papers, 5 papers with code

Detecting Stealthy Backdoor Samples based on Intra-class Distance for Large Language Models

no code implementations29 May 2025 Jinwen Chen, Hainan Zhang, Fei Sun, Qinnan Zhang, Sijia Wen, Ziwei Wang, Zhiming Zheng

And then we perform TF-IDF clustering on these suspicious samples to identify the true poisoned samples based on the intra-class distance.

Clustering Machine Translation

A Federated Splitting Framework for LLMs: Security, Efficiency, and Adaptability

1 code implementation21 May 2025 Zishuai Zhang, Hainan Zhang, JiaYing Zheng, Ziwei Wang, Yongxin Tong, Jin Dong, Zhiming Zheng

However, it still faces significant challenges in security, efficiency, and adaptability: 1) embedding gradients are vulnerable to attacks, leading to reverse engineering of private data; 2) the autoregressive nature of LLMs means that federated split learning can only train and infer sequentially, causing high communication overhead; 3) fixed partition points lack adaptability to downstream tasks.

CodeBC: A More Secure Large Language Model for Smart Contract Code Generation in Blockchain

1 code implementation28 Apr 2025 LingXiang Wang, Hainan Zhang, Qinnan Zhang, Ziwei Wang, Hongwei Zheng, Jin Dong, Zhiming Zheng

To address this challenge, we introduce CodeBC, a code generation model specifically designed for generating secure smart contracts in blockchain.

Code Generation Language Modeling +2

FineFilter: A Fine-grained Noise Filtering Mechanism for Retrieval-Augmented Large Language Models

no code implementations17 Feb 2025 Qianchi Zhang, Hainan Zhang, Liang Pang, Ziwei Wang, Hongwei Zheng, Yongxin Tong, Zhiming Zheng

Unlike these document-level operations, we treat noise filtering as a sentence-level MinMax optimization problem: first identifying potential clues from multiple documents, then ranking them by relevance, and finally retaining the minimum number of clues through truncation.

RAG Reranking +3

AdaComp: Extractive Context Compression with Adaptive Predictor for Retrieval-Augmented Large Language Models

no code implementations3 Sep 2024 Qianchi Zhang, Hainan Zhang, Liang Pang, Hongwei Zheng, Zhiming Zheng

Specifically, we first annotate the minimum top-k documents necessary for the RAG system to answer the current query as the compression rate and then construct triplets of the query, retrieved documents, and its compression rate.

RAG Retrieval +1

HSF: Defending against Jailbreak Attacks with Hidden State Filtering

no code implementations31 Aug 2024 Cheng Qian, Hainan Zhang, Lei Sha, Zhiming Zheng

With the growing deployment of LLMs in daily applications like chatbots and content generation, efforts to ensure outputs align with human values and avoid harmful content have intensified.

LLM Jailbreak

Safely Learning with Private Data: A Federated Learning Framework for Large Language Model

1 code implementation21 Jun 2024 JiaYing Zheng, Hainan Zhang, LingXiang Wang, Wangjie Qiu, Hongwei Zheng, Zhiming Zheng

An alternative, split learning, offloads most training parameters to the server while training embedding and output layers locally, making it more suitable for LLM.

Federated Learning Language Modeling +2

Policy Optimization with Smooth Guidance Learned from State-Only Demonstrations

no code implementations30 Dec 2023 GuoJian Wang, Faguo Wu, Xiao Zhang, Tianyuan Chen, Zhiming Zheng

The sparsity of reward feedback remains a challenging problem in online deep reinforcement learning (DRL).

Deep Reinforcement Learning

Adaptive trajectory-constrained exploration strategy for deep reinforcement learning

1 code implementation27 Dec 2023 GuoJian Wang, Faguo Wu, Xiao Zhang, Ning Guo, Zhiming Zheng

Deep reinforcement learning (DRL) faces significant challenges in addressing the hard-exploration problems in tasks with sparse or deceptive rewards and large state spaces.

Deep Reinforcement Learning MuJoCo +2

An Evolution Kernel Method for Graph Classification through Heat Diffusion Dynamics

no code implementations26 Jun 2023 Xue Liu, Dan Sun, Wei Wei, Zhiming Zheng

This approach incorporates the physics-based heat kernel and DropNode technique to transform each static graph into a sequence of temporal ones.

Graph Classification

Enhanced brain structure-function tethering in transmodal cortex revealed by high-frequency eigenmodes

no code implementations7 Jul 2022 Yaqian Yang, Zhiming Zheng, Longzhao Liu, Hongwei Zheng, Yi Zhen, Yi Zheng, Xin Wang, Shaoting Tang

Specifically, low-frequency eigenmodes, which are considered sufficient to capture the essence of the functional network, contribute little to functional connectivity reconstruction in transmodal regions, resulting in structure-function decoupling along the unimodal-transmodal gradient.

Functional Connectivity

Parameter Convex Neural Networks

no code implementations11 Jun 2022 Jingcheng Zhou, Wei Wei, Xing Li, Bowen Pang, Zhiming Zheng

Deep learning utilizing deep neural networks (DNNs) has achieved a lot of success recently in many important areas such as computer vision, natural language processing, and recommendation systems.

Graph Attention Recommendation Systems

A novel feed rate scheduling method based on Sigmoid function with chord error and kinematics constraints

no code implementations12 May 2021 Hexiong Li, Xin Jiang, Guanying Huo, Cheng Su, Bolun Wang, Yifei Hu, Zhiming Zheng

With the consideration of kinematic limitation and machining efficiency, a time-optimal feed rate adjustment algorithm is proposed to further adjust feed rate value at breaking points.

Scheduling

Research of Damped Newton Stochastic Gradient Descent Method for Neural Network Training

no code implementations31 Mar 2021 Jingcheng Zhou, Wei Wei, Zhiming Zheng

First-order methods like stochastic gradient descent(SGD) are recently the popular optimization method to train deep neural networks (DNNs), but second-order methods are scarcely used because of the overpriced computing cost in getting the high-order information.

regression Second-order methods

A novel S-shape based NURBS interpolation with acc-jerk- Continuity and round-off error elimination

no code implementations26 Mar 2021 Yifei Hu, Xin Jiang, Guanying Huo, Cheng Su, Bolun Wang, Hexiong Li, Zhiming Zheng

The algorithm consists of three modules: bidirectional scanning module, velocity scheduling module and round-off error elimination module.

Scheduling

Representation Learning of Reconstructed Graphs Using Random Walk Graph Convolutional Network

no code implementations2 Jan 2021 Xing Li, Wei Wei, Xiangnan Feng, Zhiming Zheng

Graphs are often used to organize data because of their simple topological structure, and therefore play a key role in machine learning.

Graph Neural Network Graph Representation Learning +2

Representation Learning of Graphs Using Graph Convolutional Multilayer Networks Based on Motifs

no code implementations31 Jul 2020 Xing Li, Wei Wei, Xiangnan Feng, Xue Liu, Zhiming Zheng

The graph structure is a commonly used data storage mode, and it turns out that the low-dimensional embedded representation of nodes in the graph is extremely useful in various typical tasks, such as node classification, link prediction , etc.

Clustering Graph Neural Network +3

Discriminative Embedding Autoencoder with a Regressor Feedback for Zero-Shot Learning

no code implementations18 Jul 2019 Ying Shi, Wei Wei, Zhiming Zheng

Zero-shot learning (ZSL) aims to recognize the novel object categories using the semantic representation of categories, and the key idea is to explore the knowledge of how the novel class is semantically related to the familiar classes.

Decoder Generalized Zero-Shot Learning +1

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