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25th International Conference on Parallel and Distributed Computing, Applications and Technologies, PDCAT 2024

作者： Zhang, Feng Wang, Jia-Xin Hua, Qiang Dong, Chun-Ru Zhu, Jie Hebei Key Laboratory of Machine Learning and Computational Intelligence College of Mathematics and Information Science Hebei University Baoding China

ISBN: (纸本)9789819642069

To handle model bias from long-tailed image datasets, most existing studies have proposed to strengthen the focus on tail classes. However, they usually overlook the intricacies of sample learning hardness and feature norms’ impact on accuracy, as well as the non-target class contribution. We designed a new loss using logit adjustment. It considers the distribution of the number of class samples, sample learning hardness, and feature norms. Moreover, it combines a complementary entropy regularization term designed for long-tailed data. Extensive experiments on long-tailed datasets confirm the proposed loss’s superiority in enhancing classification accuracy. © The Author(s), under exclusive license to Springer Nature Singapore Pte Ltd. 2025.

关键词： Contrastive learning

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Discriminative Score Suppression for Weakly Supervised Video Anomaly Detection

Discriminative Score Suppression for Weakly Supervised Video...

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2025 IEEE/CVF Winter Conference on Applications of Computer Vision, WACV 2025

作者： Xu, Chen Li, Chunguo Xing, Hongjie College of Mathematics and Information Science Hebei University Hebei Key Laboratory of Machine Learning and Computational Intelligence Baoding071002 China School of Cyber Security and Computer Hebei University Baoding071000 China

ISBN: (纸本)9798331510831

Weakly supervised video anomaly detection (WSVAD) often relies on Multiple Instance learning (MIL). However, selecting only the most discriminative segments for training limits the model's ability to comprehensively detect anomalous events, particularly hard anomalies. To overcome this limitation, we propose the Discriminative Score Suppression (DSS) module. This module suppresses the discriminative scores of the most prominent anomalies, shifting the model's attention to less obvious but important hard anomalies. This approach guides the model to learn the critical features of hard anomalies, enabling a more comprehensive detection of anomalous events. Additionally, the Anomaly Score Refinement (ASR) module constructs a dissimilarity-based classifier by storing normal patterns as prototypes, and integrates this with a neural network classifier. By combining the anomaly scores from both classifiers, more accurate detection of true hard anomalies is achieved. A score-sensitive inner-bag loss function not only adjusts penalties based on anomaly scores but also ensures that the model avoids erroneous selections. Our method accurately detects various anomalies, including challenging and multi-segment anomalies, while minimizing false positives for normal events. Extensive experiments show that the proposed framework outperforms state-of-the-art methods on the UCF-Crime and XD-Violence datasets. © 2025 IEEE.

关键词： Supervised learning

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A Multiscale Global-Local Transformer for Long-Sequence PV Power Generation Forecasting 25th

A Multiscale Global-Local Transformer for Long-Sequence PV ...

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25th International Conference on Parallel and Distributed Computing, Applications and Technologies, PDCAT 2024

作者： Deng, Tian-Yang Li, Wen-Li Zhang, Feng Hua, Qiang Dong, Chun-Ru Lim, Boon Han Hebei Key Laboratory of Machine Learning and Computational Intelligence Baoding China College of Mathematics and Information Science Hebei University Baoding China Lee Kong Chian Faculty of Engineering and Science Universiti Tunku Abdul Rahman Kajang Malaysia

ISBN: (纸本)9789819642069

The intermittent and fluctuating solar irradiance makes photovoltaic (PV) power generation unstable, which brings great challenges to the power grid system. Existing deep learning-based PV power generation prediction models usually employ Long Short-Term Memory (LSTM) or Convolutional Neural Networks (CNNs) to predict the future PV power generation. However, the recurrent structure-based methods usually failed to model the long-term dependence due to the accumulated error caused by backpropagation through time. To overcome these issues, an improved Transformer-based prediction model, which is called GLformer, is proposed in this work. Specifically, the proposed GLformer decomposes an input series into global pattern subsequences and local pattern subsequences, where the global pattern subsequences represent the trends and seasonality and the local pattern subsequences are used to describe the fluctuations. The global and local features are extracted and fused using a Transformer-based global-local feature extraction module, which enhances the model’s capability of modeling long-term dependence, and obtaining complete time features for prediction. Extensive experimental results show that the proposed method is superior to most SOTA forecasting models. © The Author(s), under exclusive license to Springer Nature Singapore Pte Ltd. 2025.

关键词： Deep learning PV power forecasting Solar energy Transformer

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Discriminative Score Suppression for Weakly Supervised Video Anomaly Detection

Discriminative Score Suppression for Weakly Supervised Video...

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IEEE Workshop on Applications of Computer Vision (WACV)

作者： Chen Xu Chunguo Li Hongjie Xing Hebei Key Laboratory of Machine Learning and Computational Intelligence College of Mathematics and Information Science Hebei University Baoding China School of Cyber Security and Computer Hebei University Baoding China

ISBN: (数字)9798331510831

ISBN: (纸本)9798331510848

关键词： Training Computer vision Accuracy Neural networks Prototypes Benchmark testing Feature extraction Robustness Anomaly detection

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A novel deep high-level concept-mining jointing hashing model for unsupervised cross-modal retrieval

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High-Confidence Computing 2025年第2期5卷

作者： Dong, Chun-Ru Zhang, Jun-Yan Zhang, Feng Hua, Qiang Xu, Dachuan Hebei Key Laboratory of Machine Learning and Computational Intelligence College of Mathematics and Information Science Hebei University Baoding071002 China Beijing Institute for Scientific and Engineering Computing Beijing University of Technology Beijing100124 China

Unsupervised cross-modal hashing has achieved great success in various information retrieval applications owing to its efficient storage usage and fast retrieval speed. Recent studies have primarily focused on training the hash-encoded networks by calculating a sample-based similarity matrix to improve the retrieval performance. However, there are two issues remain to solve: (1) The current sample-based similarity matrix only considers the similarity between image-text pairs, ignoring the different information densities of each modality, which may introduce additional noise and fail to mine key information for retrieval;(2) Most existing unsupervised cross-modal hashing methods only consider alignment between different modalities, while ignoring consistency between each modality, resulting in semantic conflicts. To tackle these challenges, a novel Deep High-level Concept-mining Jointing Hashing (DHCJH) model for unsupervised cross-modal retrieval is proposed in this study. DHCJH is able to capture the essential high-level semantic information from image modalities and integrate into the text modalities to improve the accuracy of guidance information. Additionally, a new hashing loss with a regularization term is introduced to avoid the cross-modal semantic collision and false positive pairs problems. To validate the proposed method, extensive comparison experiments on benchmark datasets are conducted. Experimental findings reveal that DHCJH achieves superior performance in both accuracy and efficiency. The code of DHCJH is available at Github. © 2024 The Author(s)

关键词： Online searching

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MTTF: a multimodal transformer for temperature forecasting

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International Journal of Computers and Applications 2024年第2期46卷 122-135页

作者： Cao, Yang Zhai, Junhai Zhang, Wei Zhou, Xuesong Zhang, Feng Key Laboratory of Machine Learning and Computational Intelligence College of Mathematics and Information Science Hebei University Hebei Province Baoding China

Accurate weather forecasting is crucial for various applications, including agriculture and environmental monitoring. However, existing deep learning based methods typically use only temperature observations as input, which do not consider spatial location (e.g. neighboring regions usually show similar temperature trends) and increase the difficulty in predicting anomalous fluctuations in temperature. To address the issue, a multimodal transformer model for temperature forecasting is proposed. This model not only uses observational data (time series data) as input but also incorporates spatially rich ERA5 reanalysis temperature data (spatio-temporal data). The proposed method has two distinctive features: (1) a sequence merging module to highlight dominating features and reduce the cost of attention calculations. (2) a cross-all-modal attention mechanism to capture dependencies between the current modality and all modalities. The method was evaluated on three temperature datasets from a plain and two challenging high-altitude mountainous regions. Results showed that the proposed method outperforms existing methods in terms of MAE and MSE, offering a promising new solution for temperature prediction. Our code and data are available at https://***/Adam618/MTTF. © 2023 Informa UK Limited, trading as Taylor & Francis Group.

关键词： Weather forecasting

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Nonlinear dynamics of a classical rotating pendulum system with multiple excitations

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Chinese Physics B 2020年第11期29卷 230-243页

作者： Ning Han Pei-Pei Lu Key Laboratory of Machine Learning and Computational Intelligence College of Mathematics and Information ScienceHebei UniversityBaoding 071002China

We report an attempt to reveal the nonlinear dynamic behavior of a classical rotating pendulum system subjected to combined excitations of constant force and periodic *** unperturbed system characterized by strong irrational nonlinearity bears significant similarities to the coupling of a simple pendulum and a smooth and discontinuous(SD)oscillator,especially the phase trajectory with coexistence of Duffing-type and pendulum-type homoclinic *** order to learn the effect of constant force on this pendulum system,all types of phase portraits are displayed by means of the Hamiltonian function with large constant excitation especially the transitions of complex singular closed *** sufficiently small perturbations of the viscous damping and constant excitation,the Melnikov method is used to analyze the global structure of the phase space and the feature of *** is shown,both theoretically and numerically,that this system undergoes a homoclinic bifurcation and then bifurcates a unique attracting rotating limit ***,the estimation of the chaotic threshold of the rotating pendulum system with multiple excitations is calculated and the predicted periodic and chaotic motions can be shown by applying numerical simulations.

关键词： rotating pendulum Melnikov method rotating limit cycle chaotic dynamics

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Regularity for minimizing sequences of some variational integrals

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Science China Mathematics 2023年第4期66卷 777-798页

作者： Hongya Gao Yanan Shan Wei Ren Hebei Key Laboratory of Machine Learning and Computational Intelligence College of Mathematics and Information ScienceHebei UniversityBaoding 071002China

This paper deals with regularity properties for minimizing sequences of some integral functionals related to the nonlinear elasticity *** some structural conditions,we derive that the minimizing sequence and the deriv... 详细信息

关键词： regularity minimizing sequence variational integral energy Ekeland variational principle

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Global Integrability for Solutions to Obstacle Problems

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Journal of Partial Differential Equations 2022年第4期35卷 320-330页

作者： SHAN Yanan GAO Hongya Hebei Key Laboratory of Machine Learning and Computational Intelligence College of Mathematics and Information ScienceHebei UniversityBaoding 071002China

DenoteκψØ(Ω)={υ∈w1,p(Ω):υ≥ψ,a,***υ-Ø∈w1,po(Ω)},where is any function in Q C R^(N),N≥2,with values in RU[±∞]and e is a measurable *** paper deals with global integrability for u E Kμ,e suc... 详细信息

关键词： Global integrability obstacle problem A-harmonic equation

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Global well-posedness and decay estimates for the 2D chemotaxis model with the supercritical case

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Journal of Mathematical Analysis and Applications 2025年第1期552卷

作者： Peiyi Liu Qian Zhang Chinese Academy of Inspection & Quarantine Greater Bayarea Zhongshan 528000 PR China Hebei Key Laboratory of Machine Learning and Computational Intelligence College of Mathematics and Information Science Hebei University Baoding 071002 PR China

In this paper, we investigate the Cauchy problem for the 2D chemotaxis model. By considering an external force term of the form − ρ q for 1 ≤ q < 2 , we establish the existence of a global classical solution and ...

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