Search Results for author: Zhiwei Yang

Found 34 papers, 15 papers with code

HiTRANS: A Hierarchical Transformer Network for Nested Named Entity Recognition

no code implementations Findings (EMNLP) 2021 Zhiwei Yang, Jing Ma, Hechang Chen, Yunke Zhang, Yi Chang

Specifically, we first utilize a two-phase module to generate span representations by aggregating context information based on a bottom-up and top-down transformer network.

named-entity-recognition Named Entity Recognition +3

Efficient training for large-scale optical neural network using an evolutionary strategy and attention pruning

no code implementations19 May 2025 Zhiwei Yang, Zeyang Fan, Yihang Lai, Qi Chen, Tian Zhang, Jian Dai, Kun Xu

Considering the influence of dynamic noise in phase shifters, our proposed CAP algorithm (performance degradation of 22. 327% for MNIST dataset and 24. 019% for Fashion-MNIST dataset utilizing a poor fabricated chip and electrical control with a standard deviation of 0. 5) exhibits strongest robustness compared with both our previously reported block adjoint training algorithm (43. 963% and 41. 074%) and the covariance matrix adaptation evolution strategy (25. 757% and 32. 871%), respectively.

SlowFastVAD: Video Anomaly Detection via Integrating Simple Detector and RAG-Enhanced Vision-Language Model

no code implementations14 Apr 2025 Zongcan Ding, Haodong Zhang, Peng Wu, Guansong Pang, Zhiwei Yang, Peng Wang, Yanning Zhang

Extensive experiments on four benchmarks demonstrate that SlowFastVAD effectively combines the strengths of both fast and slow detectors, and achieves remarkable detection accuracy and interpretability with significantly reduced computational overhead, making it well-suited for real-world VAD applications with high reliability requirements.

Anomaly Detection Domain Adaptation +6

AssistPDA: An Online Video Surveillance Assistant for Video Anomaly Prediction, Detection, and Analysis

no code implementations27 Mar 2025 Zhiwei Yang, Chen Gao, Jing Liu, Peng Wu, Guansong Pang, Mike Zheng Shou

To bridge this gap and facilitate the practical deployment of LLM-based VAD, we introduce AssistPDA, the first online video anomaly surveillance assistant that unifies video anomaly prediction, detection, and analysis (VAPDA) within a single framework.

Anomaly Detection Anomaly Forecasting +2

Exploring CLIP's Dense Knowledge for Weakly Supervised Semantic Segmentation

1 code implementation CVPR 2025 Zhiwei Yang, Yucong Meng, Kexue Fu, Feilong Tang, Shuo Wang, Zhijian Song

To mine fine-grained knowledge from visual features, our VC module first proposes Static Visual Calibration (SVC) to propagate fine-grained knowledge in a non-parametric manner.

Attribute Weakly supervised Semantic Segmentation +1

DH-Mamba: Exploring Dual-domain Hierarchical State Space Models for MRI Reconstruction

2 code implementations14 Jan 2025 Yucong Meng, Zhiwei Yang, Zhijian Song, Yonghong Shi

To address these, we propose a dual-domain hierarchical Mamba for MRI reconstruction from the following perspectives: (1) We pioneer vision Mamba in k-space learning.

Diversity Mamba +2

MoRe: Class Patch Attention Needs Regularization for Weakly Supervised Semantic Segmentation

1 code implementation15 Dec 2024 Zhiwei Yang, Yucong Meng, Kexue Fu, Shuo Wang, Zhijian Song

To this end, we first view the attention as a novel directed graph and propose the Graph Category Representation module to implicitly regularize the interaction among class-patch entities.

Weakly supervised Semantic Segmentation Weakly-Supervised Semantic Segmentation

Boosting ViT-based MRI Reconstruction from the Perspectives of Frequency Modulation, Spatial Purification, and Scale Diversification

no code implementations14 Dec 2024 Yucong Meng, Zhiwei Yang, Yonghong Shi, Zhijian Song

In this paper, we propose FPS-Former, a powerful ViT-based framework, to address these issues from the perspectives of frequency modulation, spatial purification, and scale diversification.

Image Restoration MRI Reconstruction

Towards Effective, Efficient and Unsupervised Social Event Detection in the Hyperbolic Space

2 code implementations14 Dec 2024 Xiaoyan Yu, Yifan Wei, Shuaishuai Zhou, Zhiwei Yang, Li Sun, Hao Peng, Liehuang Zhu, Philip S. Yu

Specifically, the proposed framework first models social messages into semantic-based message anchors, and then leverages the structure of the anchor graph and the expressiveness of the hyperbolic space to acquire structure- and geometry-aware anchor representations.

Event Detection

Continuous K-space Recovery Network with Image Guidance for Fast MRI Reconstruction

no code implementations18 Nov 2024 Yucong Meng, Zhiwei Yang, Minghong Duan, Yonghong Shi, Zhijian Song

In this work, we propose a continuous k-space recovery network from a new perspective of implicit neural representation with image domain guidance, which boosts the performance of MRI reconstruction.

Decoder MRI Reconstruction

Weakly Supervised Video Anomaly Detection and Localization with Spatio-Temporal Prompts

no code implementations12 Aug 2024 Peng Wu, Xuerong Zhou, Guansong Pang, Zhiwei Yang, Qingsen Yan, Peng Wang, Yanning Zhang

Existing works typically involve extracting global features from full-resolution video frames and training frame-level classifiers to detect anomalies in the temporal dimension.

Anomaly Detection Event Detection +3

Adaptive Differentially Private Structural Entropy Minimization for Unsupervised Social Event Detection

no code implementations23 Jul 2024 Zhiwei Yang, Yuecen Wei, Haoran Li, Qian Li, Lei Jiang, Li Sun, Xiaoyan Yu, Chunming Hu, Hao Peng

In this process, our method can adaptively apply differential privacy based on the events occurring each day in an open environment to maximize the use of the privacy budget.

Event Detection

Explainable Fake News Detection With Large Language Model via Defense Among Competing Wisdom

1 code implementation6 May 2024 Bo wang, Jing Ma, Hongzhan Lin, Zhiwei Yang, Ruichao Yang, Yuan Tian, Yi Chang

To detect fake news from a sea of diverse, crowded and even competing narratives, in this paper, we propose a novel defense-based explainable fake news detection framework.

Fake News Detection Language Modeling +2

Text Prompt with Normality Guidance for Weakly Supervised Video Anomaly Detection

no code implementations CVPR 2024 Zhiwei Yang, Jing Liu, Peng Wu

Further, we propose a learnable text prompt mechanism with the assist of a normality visual prompt to further improve the matching accuracy of video event description text and video frames.

Anomaly Detection Domain Adaptation +2

An efficient dual-branch framework via implicit self-texture enhancement for arbitrary-scale histopathology image super-resolution

no code implementations28 Jan 2024 Minghong Duan, Linhao Qu, Zhiwei Yang, Manning Wang, Chenxi Zhang, Zhijian Song

Thus, we propose an Implicit Self-Texture Enhancement-based dual-branch framework (ISTE) for arbitrary-scale SR of histopathology images to address this challenge.

Image Super-Resolution whole slide images

WSDMS: Debunk Fake News via Weakly Supervised Detection of Misinforming Sentences with Contextualized Social Wisdom

1 code implementation25 Oct 2023 Ruichao Yang, Wei Gao, Jing Ma, Hongzhan Lin, Zhiwei Yang

This model only requires bag-level labels for training but is capable of inferring both sentence-level misinformation and article-level veracity, aided by relevant social media conversations that are attentively contextualized with news sentences.

Articles Misinformation +3

OpenAL: An Efficient Deep Active Learning Framework for Open-Set Pathology Image Classification

1 code implementation11 Jul 2023 Linhao Qu, Yingfan Ma, Zhiwei Yang, Manning Wang, Zhijian Song

In this paper, we formulate this scenario as an open-set AL problem and propose an efficient framework, OpenAL, to address the challenge of querying samples from an unlabeled pool with both target class and non-target class samples.

Active Learning image-classification +1

SLSG: Industrial Image Anomaly Detection by Learning Better Feature Embeddings and One-Class Classification

no code implementations30 Apr 2023 Minghui Yang, Jing Liu, Zhiwei Yang, Zhaoyang Wu

Focusing on more effective and comprehensive anomaly detection, we propose a network based on self-supervised learning and self-attentive graph convolution (SLSG) for anomaly detection.

Classification One-Class Classification +1

Boosting Whole Slide Image Classification from the Perspectives of Distribution, Correlation and Magnification

no code implementations ICCV 2023 Linhao Qu, Zhiwei Yang, Minghong Duan, Yingfan Ma, Shuo Wang, Manning Wang, Zhijian Song

However, there are still three important issues that have not been fully addressed: (1) positive bags with a low positive instance ratio are prone to the influence of a large number of negative instances; (2) the correlation between local and global features of pathology images has not been fully modeled; and (3) there is a lack of effective information interaction between different magnifications.

image-classification Image Classification +1

A Coarse-to-fine Cascaded Evidence-Distillation Neural Network for Explainable Fake News Detection

1 code implementation COLING 2022 Zhiwei Yang, Jing Ma, Hechang Chen, Hongzhan Lin, Ziyang Luo, Yi Chang

Existing fake news detection methods aim to classify a piece of news as true or false and provide veracity explanations, achieving remarkable performances.

Fake News Detection

Dynamic Local Aggregation Network with Adaptive Clusterer for Anomaly Detection

1 code implementation22 Jul 2022 Zhiwei Yang, Peng Wu, Jing Liu, Xiaotao Liu

Existing methods for anomaly detection based on memory-augmented autoencoder (AE) have the following drawbacks: (1) Establishing a memory bank requires additional memory space.

Anomaly Detection Diversity

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