Search Results for author: Chen Xu

Found 80 papers, 35 papers with code

Semantic Sentence Matching via Interacting Syntax Graphs

no code implementations COLING 2022 Chen Xu, Jun Xu, Zhenhua Dong, Ji-Rong Wen

In this paper, we formalize the task of semantic sentence matching as a problem of graph matching in which each sentence is represented as a directed graph according to its syntactic structures.

Graph Matching Sentence

Accelerating Image Generation with Sub-path Linear Approximation Model

no code implementations22 Apr 2024 Chen Xu, Tianhui Song, Weixin Feng, Xubin Li, Tiezheng Ge, Bo Zheng, LiMin Wang

Diffusion models have significantly advanced the state of the art in image, audio, and video generation tasks.

Denoising Image Generation +1

Unifying Bias and Unfairness in Information Retrieval: A Survey of Challenges and Opportunities with Large Language Models

1 code implementation17 Apr 2024 Sunhao Dai, Chen Xu, Shicheng Xu, Liang Pang, Zhenhua Dong, Jun Xu

With the rapid advancement of large language models (LLMs), information retrieval (IR) systems, such as search engines and recommender systems, have undergone a significant paradigm shift.

Fairness Information Retrieval +1

Conformal prediction for multi-dimensional time series by ellipsoidal sets

1 code implementation6 Mar 2024 Chen Xu, Hanyang Jiang, Yao Xie

Conformal prediction (CP) has been a popular method for uncertainty quantification because it is distribution-free, model-agnostic, and theoretically sound.

Conformal Prediction Prediction Intervals +3

CriticBench: Evaluating Large Language Models as Critic

1 code implementation21 Feb 2024 Tian Lan, Wenwei Zhang, Chen Xu, Heyan Huang, Dahua Lin, Kai Chen, Xian-Ling Mao

Critique ability are crucial in the scalable oversight and self-improvement of Large Language Models (LLMs).

FairSync: Ensuring Amortized Group Exposure in Distributed Recommendation Retrieval

1 code implementation16 Feb 2024 Chen Xu, Jun Xu, Yiming Ding, Xiao Zhang, Qi Qi

Specifically, FairSync resolves the issue by moving it to the dual space, where a central node aggregates historical fairness data into a vector and distributes it to all servers.

Distributed Optimization Fairness +2

LLM-based Federated Recommendation

no code implementations15 Feb 2024 Jujia Zhao, Wenjie Wang, Chen Xu, Zhaochun Ren, See-Kiong Ng, Tat-Seng Chua

Nevertheless, applying Fed4Rec to LLM-based recommendation presents two main challenges: first, an increase in the imbalance of performance across clients, affecting the system's efficiency over time, and second, a high demand on clients' computational and storage resources for local training and inference of LLMs.

Federated Learning Language Modelling +2

Post-Training Quantization for Re-parameterization via Coarse & Fine Weight Splitting

1 code implementation17 Dec 2023 Dawei Yang, Ning He, Xing Hu, Zhihang Yuan, Jiangyong Yu, Chen Xu, Zhe Jiang

Although neural networks have made remarkable advancements in various applications, they require substantial computational and memory resources.

Quantization

Do LLMs Implicitly Exhibit User Discrimination in Recommendation? An Empirical Study

no code implementations13 Nov 2023 Chen Xu, Wenjie Wang, Yuxin Li, Liang Pang, Jun Xu, Tat-Seng Chua

Recently, Large Language Models (LLMs) have enhanced user interaction, enabling seamless information retrieval and recommendations.

Information Retrieval Recommendation Systems +1

Rethinking and Improving Multi-task Learning for End-to-end Speech Translation

1 code implementation7 Nov 2023 Yuhao Zhang, Chen Xu, Bei Li, Hao Chen, Tong Xiao, Chunliang Zhang, Jingbo Zhu

Significant improvements in end-to-end speech translation (ST) have been achieved through the application of multi-task learning.

Multi-Task Learning

Flow-based Distributionally Robust Optimization

1 code implementation30 Oct 2023 Chen Xu, JongHyeok Lee, Xiuyuan Cheng, Yao Xie

We present a computationally efficient framework, called $\texttt{FlowDRO}$, for solving flow-based distributionally robust optimization (DRO) problems with Wasserstein uncertainty sets while aiming to find continuous worst-case distribution (also called the Least Favorable Distribution, LFD) and sample from it.

Bridging the Gaps of Both Modality and Language: Synchronous Bilingual CTC for Speech Translation and Speech Recognition

1 code implementation21 Sep 2023 Chen Xu, Xiaoqian Liu, Erfeng He, Yuhao Zhang, Qianqian Dong, Tong Xiao, Jingbo Zhu, Dapeng Man, Wu Yang

In this study, we present synchronous bilingual Connectionist Temporal Classification (CTC), an innovative framework that leverages dual CTC to bridge the gaps of both modality and language in the speech translation (ST) task.

speech-recognition Speech Recognition +1

DPL: Decoupled Prompt Learning for Vision-Language Models

no code implementations19 Aug 2023 Chen Xu, Yuhan Zhu, Guozhen Zhang, Haocheng Shen, Yixuan Liao, Xiaoxin Chen, Gangshan Wu, LiMin Wang

Prompt learning has emerged as an efficient and effective approach for transferring foundational Vision-Language Models (e. g., CLIP) to downstream tasks.

LTP-MMF: Towards Long-term Provider Max-min Fairness Under Recommendation Feedback Loops

1 code implementation11 Aug 2023 Chen Xu, Xiaopeng Ye, Jun Xu, Xiao Zhang, Weiran Shen, Ji-Rong Wen

RFL means that recommender system can only receive feedback on exposed items from users and update recommender models incrementally based on this feedback.

Fairness Recommendation Systems

Recent Advances in Direct Speech-to-text Translation

no code implementations20 Jun 2023 Chen Xu, Rong Ye, Qianqian Dong, Chengqi Zhao, Tom Ko, Mingxuan Wang, Tong Xiao, Jingbo Zhu

Recently, speech-to-text translation has attracted more and more attention and many studies have emerged rapidly.

Data Augmentation Knowledge Distillation +2

Modality Adaption or Regularization? A Case Study on End-to-End Speech Translation

1 code implementation13 Jun 2023 Yuchen Han, Chen Xu, Tong Xiao, Jingbo Zhu

Pre-training and fine-tuning is a paradigm for alleviating the data scarcity problem in end-to-end speech translation (E2E ST).

Progression Cognition Reinforcement Learning with Prioritized Experience for Multi-Vehicle Pursuit

1 code implementation8 Jun 2023 Xinhang Li, Yiying Yang, Zheng Yuan, Zhe Wang, Qinwen Wang, Chen Xu, Lei LI, Jianhua He, Lin Zhang

For the more challenging problem of pursuing multiple evading vehicles, these algorithms typically select a fixed target evading vehicle for pursuing vehicles without considering dynamic traffic situation, which significantly reduces pursuing success rate.

Multi-agent Reinforcement Learning reinforcement-learning

CTC-based Non-autoregressive Speech Translation

1 code implementation27 May 2023 Chen Xu, Xiaoqian Liu, Xiaowen Liu, Qingxuan Sun, Yuhao Zhang, Murun Yang, Qianqian Dong, Tom Ko, Mingxuan Wang, Tong Xiao, Anxiang Ma, Jingbo Zhu

Combining end-to-end speech translation (ST) and non-autoregressive (NAR) generation is promising in language and speech processing for their advantages of less error propagation and low latency.

Translation

Bridging the Granularity Gap for Acoustic Modeling

1 code implementation27 May 2023 Chen Xu, Yuhao Zhang, Chengbo Jiao, Xiaoqian Liu, Chi Hu, Xin Zeng, Tong Xiao, Anxiang Ma, Huizhen Wang, Jingbo Zhu

While Transformer has become the de-facto standard for speech, modeling upon the fine-grained frame-level features remains an open challenge of capturing long-distance dependencies and distributing the attention weights.

speech-recognition Speech Recognition

Computing high-dimensional optimal transport by flow neural networks

no code implementations19 May 2023 Chen Xu, Xiuyuan Cheng, Yao Xie

Flow-based models are widely used in generative tasks, including normalizing flow, where a neural network transports from a data distribution $P$ to a normal distribution.

Density Ratio Estimation Image-to-Image Translation +1

Uncovering ChatGPT's Capabilities in Recommender Systems

1 code implementation3 May 2023 Sunhao Dai, Ninglu Shao, Haiyuan Zhao, Weijie Yu, Zihua Si, Chen Xu, Zhongxiang Sun, Xiao Zhang, Jun Xu

The debut of ChatGPT has recently attracted the attention of the natural language processing (NLP) community and beyond.

Explainable Recommendation Information Retrieval +2

Generalized generalized linear models: Convex estimation and online bounds

no code implementations26 Apr 2023 Anatoli Juditsky, Arkadi Nemirovski, Yao Xie, Chen Xu

We introduce a new computational framework for estimating parameters in generalized generalized linear models (GGLM), a class of models that extends the popular generalized linear models (GLM) to account for dependencies among observations in spatio-temporal data.

Progressive Visual Prompt Learning with Contrastive Feature Re-formation

no code implementations17 Apr 2023 Chen Xu, Haocheng Shen, Fengyuan Shi, Boheng Chen, Yixuan Liao, Xiaoxin Chen, LiMin Wang

To the best of our knowledge, we are the first to demonstrate the superior performance of visual prompts in V-L models to previous prompt-based methods in downstream tasks.

Exploring Data Geometry for Continual Learning

no code implementations CVPR 2023 Zhi Gao, Chen Xu, Feng Li, Yunde Jia, Mehrtash Harandi, Yuwei Wu

Our method dynamically expands the geometry of the underlying space to match growing geometric structures induced by new data, and prevents forgetting by keeping geometric structures of old data into account.

Continual Learning

Dually Enhanced Propensity Score Estimation in Sequential Recommendation

1 code implementation15 Mar 2023 Chen Xu, Jun Xu, Xu Chen, Zhenghua Dong, Ji-Rong Wen

According to the graph, two complementary propensity scores are estimated from the views of item and user, respectively, based on the same set of user feedback data.

Sequential Recommendation

P-MMF: Provider Max-min Fairness Re-ranking in Recommender System

1 code implementation12 Mar 2023 Chen Xu, Sirui Chen, Jun Xu, Weiran Shen, Xiao Zhang, Gang Wang, Zhenghua Dong

In this paper, we proposed an online re-ranking model named Provider Max-min Fairness Re-ranking (P-MMF) to tackle the problem.

Fairness Recommendation Systems +1

OSRE: Object-to-Spot Rotation Estimation for Bike Parking Assessment

1 code implementation1 Mar 2023 Saghir Alfasly, Zaid Al-huda, Saifullah Bello, Ahmed Elazab, Jian Lu, Chen Xu

However, estimating object rotation with respect to other visual objects in the visual context of an input image still lacks deep studies due to the unavailability of object datasets with rotation annotations.

image smoothing Object +1

Normalizing flow neural networks by JKO scheme

1 code implementation NeurIPS 2023 Chen Xu, Xiuyuan Cheng, Yao Xie

Normalizing flow is a class of deep generative models for efficient sampling and likelihood estimation, which achieves attractive performance, particularly in high dimensions.

A Generative Approach for Script Event Prediction via Contrastive Fine-tuning

1 code implementation7 Dec 2022 Fangqi Zhu, Jun Gao, Changlong Yu, Wei Wang, Chen Xu, Xin Mu, Min Yang, Ruifeng Xu

First, the pretrained language models adopted by current works ignore event-level knowledge, resulting in an inability to capture the correlations between events well.

Language Modelling

Sequential Predictive Conformal Inference for Time Series

1 code implementation7 Dec 2022 Chen Xu, Yao Xie

We present a new distribution-free conformal prediction algorithm for sequential data (e. g., time series), called the \textit{sequential predictive conformal inference} (\texttt{SPCI}).

Conformal Prediction Time Series +2

Secure Decentralized IoT Service Platform Using Consortium

1 code implementation Sensors 2022 Ruipeng Zhang, Chen Xu, Mengjun Xie

The experimental results demonstrate that our solution can maintain high performance with a throughput of approximately 800 reads per second (RPS), 50–80 transactions per second (TPS), and a latency of 50 ms–2 s under light to moderate workloads.

Management

Secure Decentralized IoT Service Platform

1 code implementation Sensors 2022 Ruipeng Zhang, Chen Xu, Mengjun Xie

The experimental results demonstrate that our solution can maintain high performance with a throughput of approximately 800 reads per second (RPS), 50–80 transactions per second (TPS), and a latency of 50 ms–2 s under light to moderate workloads.

Management

Graded-Q Reinforcement Learning with Information-Enhanced State Encoder for Hierarchical Collaborative Multi-Vehicle Pursuit

1 code implementation24 Oct 2022 Yiying Yang, Xinhang Li, Zheng Yuan, Qinwen Wang, Chen Xu, Lin Zhang

However, existing works on MVP pay little attention to the importance of information exchange and cooperation among pursuing vehicles under the complex urban traffic environment.

Decision Making

Hierarchical Multi-Interest Co-Network For Coarse-Grained Ranking

no code implementations19 Oct 2022 Xu Yuan, Chen Xu, Qiwei Chen, Tao Zhuang, Hongjie Chen, Chao Li, Junfeng Ge

This paper proposes a Hierarchical Multi-Interest Co-Network (HCN) to capture users' diverse interests in the coarse-grained ranking stage.

A

1 code implementation Sensors 2022 Ruipeng Zhang, Chen Xu, Mengjun Xie

The experimental results demonstrate that our solution can maintain high performance with a throughput of approximately 800 reads per second (RPS), 50–80 transactions per second (TPS), and a latency of 50 ms–2 s under light to moderate workloads.

Management

Conformal prediction set for time-series

2 code implementations15 Jun 2022 Chen Xu, Yao Xie

When building either prediction intervals for regression (with real-valued response) or prediction sets for classification (with categorical responses), uncertainty quantification is essential to studying complex machine learning methods.

Conformal Prediction Prediction Intervals +4

Invertible Neural Networks for Graph Prediction

1 code implementation2 Jun 2022 Chen Xu, Xiuyuan Cheng, Yao Xie

The proposed model consists of an invertible sub-network that maps one-to-one from data to an intermediate encoded feature, which allows forward prediction by a linear classification sub-network as well as efficient generation from output labels via a parametric mixture model.

Anomaly Detection

COSPLAY: Concept Set Guided Personalized Dialogue Generation Across Both Party Personas

1 code implementation2 May 2022 Chen Xu, Piji Li, Wei Wang, Haoran Yang, Siyun Wang, Chuangbai Xiao

In this work, we propose COSPLAY(COncept Set guided PersonaLized dialogue generation Across both partY personas) that considers both parties as a "team": expressing self-persona while keeping curiosity toward the partner, leading responses around mutual personas, and finding the common ground.

Dialogue Generation

Learnable Irrelevant Modality Dropout for Multimodal Action Recognition on Modality-Specific Annotated Videos

no code implementations CVPR 2022 Saghir Alfasly, Jian Lu, Chen Xu, Yuru Zou

However, effectively leveraging the audio modality in vision-specific annotated videos for action recognition is of particular challenge.

Action Recognition

An alternative approach to train neural networks using monotone variational inequality

1 code implementation17 Feb 2022 Chen Xu, Xiuyuan Cheng, Yao Xie

We propose an alternative approach to neural network training using the monotone vector field, an idea inspired by the seminal work of Juditsky and Nemirovski [Juditsky & Nemirovsky, 2019] developed originally to solve parameter estimation problems for generalized linear models (GLM) by reducing the original non-convex problem to a convex problem of solving a monotone variational inequality (VI).

A Credibility-aware Swarm-Federated Deep Learning Framework in Internet of Vehicles

1 code implementation9 Aug 2021 Zhe Wang, Xinhang Li, Tianhao Wu, Chen Xu, Lin Zhang

This paper proposes a Swarm-Federated Deep Learning framework in the IoV system (IoV-SFDL) that integrates SL into the FDL framework.

BIG-bench Machine Learning Edge-computing

The NiuTrans End-to-End Speech Translation System for IWSLT 2021 Offline Task

no code implementations ACL (IWSLT) 2021 Chen Xu, Xiaoqian Liu, Xiaowen Liu, Laohu Wang, Canan Huang, Tong Xiao, Jingbo Zhu

This paper describes the submission of the NiuTrans end-to-end speech translation system for the IWSLT 2021 offline task, which translates from the English audio to German text directly without intermediate transcription.

Position Translation

Conformal Anomaly Detection on Spatio-Temporal Observations with Missing Data

1 code implementation25 May 2021 Chen Xu, Yao Xie

We develop a distribution-free, unsupervised anomaly detection method called ECAD, which wraps around any regression algorithm and sequentially detects anomalies.

Conformal Prediction Prediction Intervals +2

Stacked Acoustic-and-Textual Encoding: Integrating the Pre-trained Models into Speech Translation Encoders

no code implementations ACL 2021 Chen Xu, Bojie Hu, Yanyang Li, Yuhao Zhang, Shen Huang, Qi Ju, Tong Xiao, Jingbo Zhu

To our knowledge, we are the first to develop an end-to-end ST system that achieves comparable or even better BLEU performance than the cascaded ST counterpart when large-scale ASR and MT data is available.

Automatic Speech Recognition Automatic Speech Recognition (ASR) +4

DPR-CAE: Capsule Autoencoder with Dynamic Part Representation for Image Parsing

no code implementations30 Apr 2021 Canqun Xiang, Zhennan Wang, Wenbin Zou, Chen Xu

Parsing an image into a hierarchy of objects, parts, and relations is important and also challenging in many computer vision tasks.

Translation

Smart Scheduling based on Deep Reinforcement Learning for Cellular Networks

no code implementations22 Mar 2021 Jian Wang, Chen Xu, Rong Li, Yiqun Ge, Jun Wang

We not only verify the performance gain achieved, but also provide implementation-friend designs, i. e., a scalable neural network design for the agent and a virtual environment training framework.

Fairness Management +3

Cooling in poor air quality environments -- Impact of fan operation on particle deposition

no code implementations25 Feb 2021 Jason Stafford, Chen Xu

This study investigates particle transport behaviour arising from axial fans operating under varied aerodynamic conditions.

Fluid Dynamics Atmospheric and Oceanic Physics

Estimating Adsorption Isotherm Parameters in Chromatography via a Virtual Injection Promoting Feed-forward Neural Network

no code implementations31 Jan 2021 Chen Xu, Ye Zhang

The means to obtain the adsorption isotherms is a fundamental open problem in competitive chromatography.

Solar Radiation Ramping Events Modeling Using Spatio-temporal Point Processes

no code implementations27 Jan 2021 Minghe Zhang, Chen Xu, Andy Sun, Feng Qiu, Yao Xie

Modeling and predicting solar events, particularly the solar ramping event, is critical for improving situational awareness for solar power generation systems.

Point Processes Position

PURE: An Uncertainty-aware Recommendation Framework for Maximizing Expected Posterior Utility of Platform

no code implementations1 Jan 2021 Haokun Chen, Zhaoyang Liu, Chen Xu, Ziqian Chen, Jinyang Gao, Bolin Ding

In this paper, we propose a novel recommendation framework which effectively utilizes the information of user uncertainty over different item dimensions and explicitly takes into consideration the impact of display policy on user in order to achieve maximal expected posterior utility for the platform.

Multi-task Additive Models for Robust Estimation and Automatic Structure Discovery

no code implementations NeurIPS 2020 Yingjie Wang, Hong Chen, Feng Zheng, Chen Xu, Tieliang Gong, Yanhong Chen

For high-dimensional observations in real environment, e. g., Coronal Mass Ejections (CMEs) data, the learning performance of previous methods may be degraded seriously due to the complex non-Gaussian noise and the insufficiency of prior knowledge on variable structure.

Additive models Bilevel Optimization +1

Conformal prediction interval for dynamic time-series

2 code implementations18 Oct 2020 Chen Xu, Yao Xie

We develop a method to construct distribution-free prediction intervals for dynamic time-series, called \Verb|EnbPI| that wraps around any bootstrap ensemble estimator to construct sequential prediction intervals.

Conformal Prediction Ensemble Learning +5

MMA Regularization: Decorrelating Weights of Neural Networks by Maximizing the Minimal Angles

1 code implementation NeurIPS 2020 Zhennan Wang, Canqun Xiang, Wenbin Zou, Chen Xu

Extensive experiments demonstrate that MMA regularization is able to enhance the generalization ability of various modern models and achieves considerable performance improvements on CIFAR100 and TinyImageNet datasets.

Face Verification

SAIS: Single-stage Anchor-free Instance Segmentation

no code implementations3 Dec 2019 Canqun Xiang, Shishun Tian, Wenbin Zou, Chen Xu

In this paper, we propose a simple yet efficientinstance segmentation approach based on the single-stage anchor-free detector, termed SAIS.

Instance Segmentation regression +1

Buffer-aware Wireless Scheduling based on Deep Reinforcement Learning

no code implementations13 Nov 2019 Chen Xu, Jian Wang, Tianhang Yu, Chuili Kong, Yourui Huangfu, Rong Li, Yiqun Ge, Jun Wang

In this paper, the downlink packet scheduling problem for cellular networks is modeled, which jointly optimizes throughput, fairness and packet drop rate.

Fairness reinforcement-learning +2

Powering Hands-on Cybersecurity Practices with Cloud Computing

1 code implementation IEEE International Conference on Network Protocols (ICNP) 2019 Ruipeng Zhang, Chen Xu, Mengjun Xie

In this work, we present a cloud-based platform named EZSetup for hands-on cybersecurity practice at scale and our experience of using it in class.

Cloud Computing

Realistic Channel Models Pre-training

no code implementations22 Jul 2019 Yourui Huangfu, Jian Wang, Chen Xu, Rong Li, Yiqun Ge, Xianbin Wang, Huazi Zhang, Jun Wang

In this paper, we propose a neural-network-based realistic channel model with both the similar accuracy as deterministic channel models and uniformity as stochastic channel models.

Privileged Features Distillation at Taobao Recommendations

no code implementations11 Jul 2019 Chen Xu, Quan Li, Junfeng Ge, Jinyang Gao, Xiaoyong Yang, Changhua Pei, Fei Sun, Jian Wu, Hanxiao Sun, Wenwu Ou

To guarantee the consistency of off-line training and on-line serving, we usually utilize the same features that are both available.

Deep Reinforcement Learning for Scheduling in Cellular Networks

no code implementations15 May 2019 Jian Wang, Chen Xu, Yourui Huangfu, Rong Li, Yiqun Ge, Jun Wang

Integrating artificial intelligence (AI) into wireless networks has drawn significant interest in both industry and academia.

reinforcement-learning Reinforcement Learning (RL) +1

PR Product: A Substitute for Inner Product in Neural Networks

1 code implementation ICCV 2019 Zhennan Wang, Wenbin Zou, Chen Xu

In this paper, we analyze the inner product of weight vector w and data vector x in neural networks from the perspective of vector orthogonal decomposition and prove that the direction gradient of w decreases with the angle between them close to 0 or {\pi}.

General Classification Image Captioning +1

Predicting the Mumble of Wireless Channel with Sequence-to-Sequence Models

no code implementations14 Jan 2019 Yourui Huangfu, Jian Wang, Rong Li, Chen Xu, Xianbin Wang, Huazi Zhang, Jun Wang

Accurate prediction of fading channel in future is essential to realize adaptive transmission and other methods that can save power and provide gains.

Caption Generation Language Modelling +5

A Unified Convex Surrogate for the Schatten-$p$ Norm

no code implementations25 Nov 2016 Chen Xu, Zhouchen Lin, Hongbin Zha

In this paper, we show that for any $p$, $p_1$, and $p_2 >0$ satisfying $1/p=1/p_1+1/p_2$, there is an equivalence between the Schatten-$p$ norm of one matrix and the Schatten-$p_1$ and the Schatten-$p_2$ norms of its two factor matrices.

Matrix Completion

Relaxed Majorization-Minimization for Non-smooth and Non-convex Optimization

no code implementations25 Nov 2015 Chen Xu, Zhouchen Lin, Zhenyu Zhao, Hongbin Zha

We propose a new majorization-minimization (MM) method for non-smooth and non-convex programs, which is general enough to include the existing MM methods.

On the Feasibility of Distributed Kernel Regression for Big Data

no code implementations5 May 2015 Chen Xu, Yongquan Zhang, Runze Li

Under mild conditions, we show that, with a proper number of segments, DKR leads to an estimator that is generalization consistent to the unknown regression function.

regression valid

Does generalization performance of $l^q$ regularization learning depend on $q$? A negative example

no code implementations25 Jul 2013 Shaobo Lin, Chen Xu, Jingshan Zeng, Jian Fang

To facilitate the use of $l^{q}$-regularization, we intend to seek for a modeling strategy where an elaborative selection on $q$ is avoidable.

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