Search Results for author: Abolfazl Razi

Found 47 papers, 18 papers with code

Monte Carlo Beam Search for Actor-Critic Reinforcement Learning in Continuous Control

no code implementations13 May 2025 Hazim Alzorgan, Abolfazl Razi

Actor-critic methods, like Twin Delayed Deep Deterministic Policy Gradient (TD3), depend on basic noise-based exploration, which can result in less than optimal policy convergence.

Computational Efficiency continuous-control +1

FIC-TSC: Learning Time Series Classification with Fisher Information Constraint

no code implementations9 May 2025 Xiwen Chen, Wenhui Zhu, Peijie Qiu, Hao Wang, Huayu Li, Zihan Li, Yalin Wang, Aristeidis Sotiras, Abolfazl Razi

However, there is a large consensus that time series data often suffers from domain shifts between training and test sets, which dramatically degrades the classification performance.

Classification Time Series +2

How Effective Can Dropout Be in Multiple Instance Learning ?

1 code implementation21 Apr 2025 Wenhui Zhu, Peijie Qiu, Xiwen Chen, Zhangsihao Yang, Aristeidis Sotiras, Abolfazl Razi, Yalin Wang

Due to the gigapixel resolution of WSI, applications of MIL in WSI typically necessitate a two-stage training scheme: first, extract features from the pre-trained backbone and then perform MIL aggregation.

Multiple Instance Learning

Graph Based Deep Reinforcement Learning Aided by Transformers for Multi-Agent Cooperation

no code implementations11 Apr 2025 Michael Elrod, Niloufar Mehrabi, Rahul Amin, Manveen Kaur, Long Cheng, Jim Martin, Abolfazl Razi

Mission planning for a fleet of cooperative autonomous drones in applications that involve serving distributed target points, such as disaster response, environmental monitoring, and surveillance, is challenging, especially under partial observability, limited communication range, and uncertain environments.

Deep Reinforcement Learning Disaster Response +1

Fire and Smoke Datasets in 20 Years: An In-depth Review

no code implementations17 Mar 2025 Sayed Pedram Haeri Boroujeni, Niloufar Mehrabi, Fatemeh Afghah, Connor Peter McGrath, Danish Bhatkar, Mithilesh Anil Biradar, Abolfazl Razi

Fire and smoke phenomena pose a significant threat to the natural environment, ecosystems, and global economy, as well as human lives and wildlife.

Management

Sequence Complementor: Complementing Transformers For Time Series Forecasting with Learnable Sequences

no code implementations6 Jan 2025 Xiwen Chen, Peijie Qiu, Wenhui Zhu, Huayu Li, Hao Wang, Aristeidis Sotiras, Yalin Wang, Abolfazl Razi

Since its introduction, the transformer has shifted the development trajectory away from traditional models (e. g., RNN, MLP) in time series forecasting, which is attributed to its ability to capture global dependencies within temporal tokens.

Time Series Time Series Forecasting

Diffusion Prism: Enhancing Diversity and Morphology Consistency in Mask-to-Image Diffusion

no code implementations1 Jan 2025 Hao Wang, Xiwen Chen, Ashish Bastola, Jiayou Qin, Abolfazl Razi

The emergence of generative AI and controllable diffusion has made image-to-image synthesis increasingly practical and efficient.

Data Augmentation Diversity +2

Multimodal Variational Autoencoder: a Barycentric View

no code implementations29 Dec 2024 Peijie Qiu, Wenhui Zhu, Sayantan Kumar, Xiwen Chen, Xiaotong Sun, Jin Yang, Abolfazl Razi, Yalin Wang, Aristeidis Sotiras

Previous attempts at multimodal VAEs approach this mainly through the lens of experts, aggregating unimodal inference distributions with a product of experts (PoE), a mixture of experts (MoE), or a combination of both.

Mixture-of-Experts Representation Learning

Geographical Information Alignment Boosts Traffic Analysis via Transpose Cross-attention

no code implementations3 Dec 2024 Xiangyu Jiang, Xiwen Chen, Hao Wang, Abolfazl Razi

This module can efficiently fuse the node feature and geographic position information through a novel Transpose Cross-attention mechanism.

Position severity prediction

RobustFormer: Noise-Robust Pre-training for images and videos

no code implementations20 Nov 2024 Ashish Bastola, Nishant Luitel, Hao Wang, Danda Pani Paudel, Roshani Poudel, Abolfazl Razi

While deep learning models are powerful tools that revolutionized many areas, they are also vulnerable to noise as they rely heavily on learning patterns and features from the exact details of the clean data.

Enhancing Graph Neural Networks in Large-scale Traffic Incident Analysis with Concurrency Hypothesis

1 code implementation4 Nov 2024 Xiwen Chen, Sayed Pedram Haeri Boroujeni, Xin Shu, Huayu Li, Abolfazl Razi

The extensive experiments, utilizing real-world data across states and cities in the USA, demonstrate that integrating CP into 12 state-of-the-art GNN architectures leads to significant improvements, with gains ranging from 3% to 13% in F1 score and 1. 3% to 9% in AUC metrics.

Graph Neural Network

Adaptive Data Transport Mechanism for UAV Surveillance Missions in Lossy Environments

no code implementations30 Sep 2024 Niloufar Mehrabi, Sayed Pedram Haeri Boroujeni, Jenna Hofseth, Abolfazl Razi, Long Cheng, Manveen Kaur, James Martin, Rahul Amin

Unmanned Aerial Vehicles (UAVs) play an increasingly critical role in Intelligence, Surveillance, and Reconnaissance (ISR) missions such as border patrolling and criminal detection, thanks to their ability to access remote areas and transmit real-time imagery to processing servers.

Deep Reinforcement Learning Moving Object Detection +2

RBAD: A Dataset and Benchmark for Retinal Vessels Branching Angle Detection

1 code implementation17 Jul 2024 Hao Wang, Wenhui Zhu, Jiayou Qin, Xin Li, Oana Dumitrascu, Xiwen Chen, Peijie Qiu, Abolfazl Razi

Detecting retinal image analysis, particularly the geometrical features of branching points, plays an essential role in diagnosing eye diseases.

DGR-MIL: Exploring Diverse Global Representation in Multiple Instance Learning for Whole Slide Image Classification

1 code implementation4 Jul 2024 Wenhui Zhu, Xiwen Chen, Peijie Qiu, Aristeidis Sotiras, Abolfazl Razi, Yalin Wang

Second, we propose two mechanisms to enforce the diversity among the global vectors to be more descriptive of the entire bag: (i) positive instance alignment and (ii) a novel, efficient, and theoretically guaranteed diversification learning paradigm.

Descriptive Diversity +3

SelfReg-UNet: Self-Regularized UNet for Medical Image Segmentation

1 code implementation21 Jun 2024 Wenhui Zhu, Xiwen Chen, Peijie Qiu, Mohammad Farazi, Aristeidis Sotiras, Abolfazl Razi, Yalin Wang

Although numerous follow-up studies have also been dedicated to improving the performance of standard UNet, few have conducted in-depth analyses of the underlying interest pattern of UNet in medical image segmentation.

Decoder Image Segmentation +3

TimeMIL: Advancing Multivariate Time Series Classification via a Time-aware Multiple Instance Learning

3 code implementations6 May 2024 Xiwen Chen, Peijie Qiu, Wenhui Zhu, Huayu Li, Hao Wang, Aristeidis Sotiras, Yalin Wang, Abolfazl Razi

Deep neural networks, including transformers and convolutional neural networks, have significantly improved multivariate time series classification (MTSC).

Multiple Instance Learning Time Series +1

Imaging Signal Recovery Using Neural Network Priors Under Uncertain Forward Model Parameters

no code implementations5 May 2024 Xiwen Chen, Wenhui Zhu, Peijie Qiu, Abolfazl Razi

We theoretically demonstrate the convergence of the MA framework, which has a similar complexity with reconstruction under the known forward model parameters.

Compressive Sensing

Motor Focus: Fast Ego-Motion Prediction for Assistive Visual Navigation

1 code implementation25 Apr 2024 Hao Wang, Jiayou Qin, Xiwen Chen, Ashish Bastola, John Suchanek, Zihao Gong, Abolfazl Razi

Assistive visual navigation systems for visually impaired individuals have become increasingly popular thanks to the rise of mobile computing.

Camera Calibration Motion Compensation +5

Enhanced Cooperative Perception for Autonomous Vehicles Using Imperfect Communication

no code implementations10 Apr 2024 Ahmad Sarlak, Hazim Alzorgan, Sayed Pedram Haeri Boroujeni, Abolfazl Razi, Rahul Amin

To validate our approach, we used the CARLA simulator to create a dataset of annotated videos for different driving scenarios where pedestrian detection is challenging for an AV with compromised vision.

object-detection Object Detection +1

VisionGPT: LLM-Assisted Real-Time Anomaly Detection for Safe Visual Navigation

1 code implementation19 Mar 2024 Hao Wang, Jiayou Qin, Ashish Bastola, Xiwen Chen, John Suchanek, Zihao Gong, Abolfazl Razi

This paper explores the potential of Large Language Models(LLMs) in zero-shot anomaly detection for safe visual navigation.

Anomaly Detection object-detection +6

Opinion Dynamics in Social Multiplex Networks with Mono and Bi-directional Interactions in the Presence of Leaders

no code implementations29 Jan 2024 Amirreza Talebi, Sayed Pedram Haeri Boroujeni, Abolfazl Razi

We further scrutinize the convergence rates of opinion dynamics in networks with one-way versus two-way interactions.

Driving Towards Inclusion: A Systematic Review of AI-powered Accessibility Enhancements for People with Disability in Autonomous Vehicles

no code implementations26 Jan 2024 Ashish Bastola, Hao Wang, Sayed Pedram Haeri Boroujeni, Julian Brinkley, Ata Jahangir Moshayedi, Abolfazl Razi

This paper provides a comprehensive and, to our knowledge, the first review of inclusive human-computer interaction (HCI) within autonomous vehicles (AVs) and human-driven cars with partial autonomy, emphasizing accessibility and user-centered design principles.

Autonomous Vehicles

Enhancing Digital Hologram Reconstruction Using Reverse-Attention Loss for Untrained Physics-Driven Deep Learning Models with Uncertain Distance

no code implementations11 Jan 2024 Xiwen Chen, Hao Wang, Zhao Zhang, Zhenmin Li, Huayu Li, Tong Ye, Abolfazl Razi

Untrained Physics-based Deep Learning (DL) methods for digital holography have gained significant attention due to their benefits, such as not requiring an annotated training dataset, and providing interpretability since utilizing the governing laws of hologram formation.

SSIM

Actuator Trajectory Planning for UAVs with Overhead Manipulator using Reinforcement Learning

no code implementations24 Aug 2023 Hazim Alzorgan, Abolfazl Razi, Ata Jahangir Moshayedi

In this paper, we investigate the operation of an aerial manipulator system, namely an Unmanned Aerial Vehicle (UAV) equipped with a controllable arm with two degrees of freedom to carry out actuation tasks on the fly.

Motion Planning Navigate +3

Obscured Wildfire Flame Detection By Temporal Analysis of Smoke Patterns Captured by Unmanned Aerial Systems

no code implementations30 Jun 2023 Uma Meleti, Abolfazl Razi

This research paper addresses the challenge of detecting obscured wildfires (when the fire flames are covered by trees, smoke, clouds, and other natural barriers) in real-time using drones equipped only with RGB cameras.

Decoder Semantic Segmentation

Energy Optimization for HVAC Systems in Multi-VAV Open Offices: A Deep Reinforcement Learning Approach

2 code implementations23 Jun 2023 Hao Wang, Xiwen Chen, Natan Vital, Edward. Duffy, Abolfazl Razi

It takes only a total of 40 minutes for 5 epochs (about 7. 75 minutes per epoch) to train a network with superior performance and covering diverse conditions for its low-complexity architecture; therefore, it easily adapts to changes in the building setups, weather conditions, occupancy rate, etc.

Deep Reinforcement Learning energy management

Learning on Bandwidth Constrained Multi-Source Data with MIMO-inspired DPP MAP Inference

no code implementations4 Jun 2023 Xiwen Chen, Huayu Li, Rahul Amin, Abolfazl Razi

A determinant-preserved sparse representation of selected samples is used to perform sample precoding in local sources to be processed by DPP.

Diversity

RD-DPP: Rate-Distortion Theory Meets Determinantal Point Process to Diversify Learning Data Samples

no code implementations9 Apr 2023 Xiwen Chen, Huayu Li, Rahul Amin, Abolfazl Razi

However, the number of selected samples is restricted to the rank of the kernel matrix implied by the dimensionality of data samples.

Diversity

Fast Key Points Detection and Matching for Tree-Structured Images

no code implementations7 Nov 2022 Hao Wang, Xiwen Chen, Abolfazl Razi, Rahul Amin

The proposed algorithm is applicable to a variety of tree-structured image matching, but our focus is on dendrites, recently-developed visual identifiers.

Graph Matching Key Point Matching

DH-GAN: A Physics-driven Untrained Generative Adversarial Network for 3D Microscopic Imaging using Digital Holography

no code implementations25 May 2022 Xiwen Chen, Hao Wang, Abolfazl Razi, Michael Kozicki, Christopher Mann

Digital holography is a 3D imaging technique by emitting a laser beam with a plane wavefront to an object and measuring the intensity of the diffracted waveform, called holograms.

Generative Adversarial Network

Deep Learning Serves Traffic Safety Analysis: A Forward-looking Review

no code implementations7 Mar 2022 Abolfazl Razi, Xiwen Chen, Huayu Li, Hao Wang, Brendan Russo, Yan Chen, Hongbin Yu

This paper explores Deep Learning (DL) methods that are used or have the potential to be used for traffic video analysis, emphasizing driving safety for both Autonomous Vehicles (AVs) and human-operated vehicles.

Anomaly Detection Autonomous Vehicles +6

Network-level Safety Metrics for Overall Traffic Safety Assessment: A Case Study

no code implementations27 Jan 2022 Xiwen Chen, Hao Wang, Abolfazl Razi, Brendan Russo, Jason Pacheco, John Roberts, Jeffrey Wishart, Larry Head, Alonso Granados Baca

To bridge these two perspectives, we define a new set of network-level safety metrics (NSM) to assess the overall safety profile of traffic flow by processing imagery taken by RSU cameras.

Autonomous Driving Edge-computing +1

Fully-echoed Q-routing with Simulated Annealing Inference for Flying Adhoc Networks

no code implementations23 Mar 2021 Arnau Rovira-Sugranes, Fatemeh Afghah, Junsuo Qu, Abolfazl Razi

Current networking protocols deem inefficient in accommodating the two key challenges of Unmanned Aerial Vehicle (UAV) networks, namely the network connectivity loss and energy limitations.

Aerial Imagery Pile burn detection using Deep Learning: the FLAME dataset

2 code implementations28 Dec 2020 Alireza Shamsoshoara, Fatemeh Afghah, Abolfazl Razi, Liming Zheng, Peter Z Fulé, Erik Blasch

FLAME (Fire Luminosity Airborne-based Machine learning Evaluation) offers a dataset of aerial images of fires along with methods for fire detection and segmentation which can help firefighters and researchers to develop optimal fire management strategies.

BIG-bench Machine Learning Binary Classification +3

Deep DIH : Statistically Inferred Reconstruction of Digital In-Line Holography by Deep Learning

1 code implementation25 Apr 2020 Huayu Li, Xiwen Chen, Haiyu Wu, Zaoyi Chi, Christopher Mann, Abolfazl Razi

Recently, end-to-end deep learning-based methods have been utilized to reconstruct the object wavefront (as a surrogate for the 3D structure of the object) directly from a single-shot in-line digital hologram.

Deep Learning

An Autonomous Spectrum Management Scheme for Unmanned Aerial Vehicle Networks in Disaster Relief Operations

1 code implementation26 Nov 2019 Alireza Shamsoshoara, Fatemeh Afghah, Abolfazl Razi, Sajad Mousavi, Jonathan Ashdown, Kurt Turk

This paper studies the problem of spectrum shortage in an unmanned aerial vehicle (UAV) network during critical missions such as wildfire monitoring, search and rescue, and disaster monitoring.

Management Reinforcement Learning

A Solution for Dynamic Spectrum Management in Mission-Critical UAV Networks

2 code implementations16 Apr 2019 Alireza Shamsoshoara, Mehrdad Khaledi, Fatemeh Afghah, Abolfazl Razi, Jonathan Ashdown, Kurt Turck

In this paper, we study the problem of spectrum scarcity in a network of unmanned aerial vehicles (UAVs) during mission-critical applications such as disaster monitoring and public safety missions, where the pre-allocated spectrum is not sufficient to offer a high data transmission rate for real-time video-streaming.

Management Reinforcement Learning

A Unified Framework for Joint Mobility Prediction and Object Profiling of Drones in UAV Networks

no code implementations31 Jul 2018 Han Peng, Abolfazl Razi, Fatemeh Afghah, Jonathan Ashdown

In recent years, using a network of autonomous and cooperative unmanned aerial vehicles (UAVs) without command and communication from the ground station has become more imperative, in particular in search-and-rescue operations, disaster management, and other applications where human intervention is limited.

Management

A Shapley Value Solution to Game Theoretic-based Feature Reduction in False Alarm Detection

no code implementations5 Dec 2015 Fatemeh Afghah, Abolfazl Razi, Kayvan Najarian

False alarm is one of the main concerns in intensive care units and can result in care disruption, sleep deprivation, and insensitivity of care-givers to alarms.

General Classification

Cannot find the paper you are looking for? You can Submit a new open access paper.