Search Results for author: B. Aditya Prakash

Found 24 papers, 15 papers with code

A Review of Graph Neural Networks in Epidemic Modeling

1 code implementation28 Mar 2024 Zewen Liu, Guancheng Wan, B. Aditya Prakash, Max S. Y. Lau, Wei Jin

In this paper, we endeavor to furnish a comprehensive review of GNNs in epidemic tasks and highlight potential future directions.

Epidemiology

A Comprehensive Survey on Graph Reduction: Sparsification, Coarsening, and Condensation

2 code implementations29 Jan 2024 Mohammad Hashemi, Shengbo Gong, Juntong Ni, Wenqi Fan, B. Aditya Prakash, Wei Jin

In this survey, we aim to provide a comprehensive understanding of graph reduction methods, including graph sparsification, graph coarsening, and graph condensation.

Large Pre-trained time series models for cross-domain Time series analysis tasks

no code implementations19 Nov 2023 Harshavardhan Kamarthi, B. Aditya Prakash

Large pre-trained models have been instrumental in significant advancements in domains like language and vision making model training for individual downstream tasks more efficient as well as provide superior performance.

Self-Supervised Learning Time Series +1

PEMS: Pre-trained Epidemic Time-series Models

no code implementations14 Nov 2023 Harshavardhan Kamarthi, B. Aditya Prakash

We tackle various important challenges specific to pre-training for epidemic time-series such as dealing with heterogeneous dynamics and efficiently capturing useful patterns from multiple epidemic datasets by carefully designing the SSL tasks to learn important priors about the epidemic dynamics that can be leveraged for fine-tuning to multiple downstream tasks.

Self-Supervised Learning Time Series

When Rigidity Hurts: Soft Consistency Regularization for Probabilistic Hierarchical Time Series Forecasting

1 code implementation17 Oct 2023 Harshavardhan Kamarthi, Lingkai Kong, Alexander Rodríguez, Chao Zhang, B. Aditya Prakash

We close both these gap and propose PROFHiT, which is a fully probabilistic hierarchical forecasting model that jointly models forecast distribution of entire hierarchy.

Time Series Time Series Forecasting

Performative Time-Series Forecasting

1 code implementation9 Oct 2023 Zhiyuan Zhao, Alexander Rodriguez, B. Aditya Prakash

Time-series forecasting is a critical challenge in various domains and has witnessed substantial progress in recent years.

Time Series Time Series Forecasting

DF2: Distribution-Free Decision-Focused Learning

no code implementations11 Aug 2023 Lingkai Kong, Wenhao Mu, Jiaming Cui, Yuchen Zhuang, B. Aditya Prakash, Bo Dai, Chao Zhang

However, existing end-to-end DFL methods are hindered by three significant bottlenecks: model mismatch error, sample average approximation error, and gradient approximation error.

PINNsFormer: A Transformer-Based Framework For Physics-Informed Neural Networks

1 code implementation21 Jul 2023 Zhiyuan Zhao, Xueying Ding, B. Aditya Prakash

Physics-Informed Neural Networks (PINNs) have emerged as a promising deep learning framework for approximating numerical solutions to partial differential equations (PDEs).

Autoregressive Diffusion Model for Graph Generation

1 code implementation17 Jul 2023 Lingkai Kong, Jiaming Cui, Haotian Sun, Yuchen Zhuang, B. Aditya Prakash, Chao Zhang

However, existing diffusion-based graph generative models are mostly one-shot generative models that apply Gaussian diffusion in the dequantized adjacency matrix space.

Denoising Graph Generation

End-to-End Stochastic Optimization with Energy-Based Model

1 code implementation25 Nov 2022 Lingkai Kong, Jiaming Cui, Yuchen Zhuang, Rui Feng, B. Aditya Prakash, Chao Zhang

Decision-focused learning (DFL) was recently proposed for stochastic optimization problems that involve unknown parameters.

Scheduling Stochastic Optimization

Differentiable Agent-based Epidemiology

1 code implementation20 Jul 2022 Ayush Chopra, Alexander Rodríguez, Jayakumar Subramanian, Arnau Quera-Bofarull, Balaji Krishnamurthy, B. Aditya Prakash, Ramesh Raskar

Mechanistic simulators are an indispensable tool for epidemiology to explore the behavior of complex, dynamic infections under varying conditions and navigate uncertain environments.

Epidemiology Navigate

Data-Centric Epidemic Forecasting: A Survey

no code implementations19 Jul 2022 Alexander Rodríguez, Harshavardhan Kamarthi, Pulak Agarwal, Javen Ho, Mira Patel, Suchet Sapre, B. Aditya Prakash

The COVID-19 pandemic has brought forth the importance of epidemic forecasting for decision makers in multiple domains, ranging from public health to the economy as a whole.

Decision Making Navigate +1

When Rigidity Hurts: Soft Consistency Regularization for Probabilistic Hierarchical Time Series Forecasting

1 code implementation16 Jun 2022 Harshavardhan Kamarthi, Lingkai Kong, Alexander Rodríguez, Chao Zhang, B. Aditya Prakash

We close both these gap and propose PROFHiT, which is a fully probabilistic hierarchical forecasting model that jointly models forecast distribution of entire hierarchy.

Time Series Time Series Forecasting

EINNs: Epidemiologically-informed Neural Networks

1 code implementation21 Feb 2022 Alexander Rodríguez, Jiaming Cui, Naren Ramakrishnan, Bijaya Adhikari, B. Aditya Prakash

We introduce EINNs, a framework crafted for epidemic forecasting that builds upon the theoretical grounds provided by mechanistic models as well as the data-driven expressibility afforded by AI models, and their capabilities to ingest heterogeneous information.

Inductive Bias

CAMul: Calibrated and Accurate Multi-view Time-Series Forecasting

1 code implementation15 Sep 2021 Harshavardhan Kamarthi, Lingkai Kong, Alexander Rodríguez, Chao Zhang, B. Aditya Prakash

We use CAMul for multiple domains with varied sources and modalities and show that CAMul outperforms other state-of-art probabilistic forecasting models by over 25\% in accuracy and calibration.

Decision Making Probabilistic Time Series Forecasting +1

Back2Future: Leveraging Backfill Dynamics for Improving Real-time Predictions in Future

1 code implementation ICLR 2022 Harshavardhan Kamarthi, Alexander Rodríguez, B. Aditya Prakash

Our extensive experiments demonstrate that our method refines the performance of top models for COVID-19 forecasting, in contrast to non-trivial baselines, yielding 18% improvement over baselines, enabling us obtain a new SOTA performance.

When in Doubt: Neural Non-Parametric Uncertainty Quantification for Epidemic Forecasting

1 code implementation NeurIPS 2021 Harshavardhan Kamarthi, Lingkai Kong, Alexander Rodríguez, Chao Zhang, B. Aditya Prakash

We model the forecasting task as a probabilistic generative process and propose a functional neural process model called EPIFNP, which directly models the probability density of the forecast value.

Time Series Time Series Forecasting +1

Incorporating Expert Guidance in Epidemic Forecasting

no code implementations24 Dec 2020 Alexander Rodríguez, Bijaya Adhikari, Naren Ramakrishnan, B. Aditya Prakash

Forecasting influenza like illnesses (ILI) has rapidly progressed in recent years from an art to a science with a plethora of data-driven methods.

NetReAct: Interactive Learning for Network Summarization

no code implementations22 Dec 2020 Sorour E. Amiri, Bijaya Adhikari, John Wenskovitch, Alexander Rodriguez, Michelle Dowling, Chris North, B. Aditya Prakash

The analyst can express her agreement/disagreement with the visualization of the network summary via iterative feedback, e. g. closing or moving documents ("nodes") together.

Mapping Network States Using Connectivity Queries

1 code implementation7 Dec 2020 Alexander Rodríguez, Bijaya Adhikari, Andrés D. González, Charles Nicholson, Anil Vullikanti, B. Aditya Prakash

In contrast, we study the harder problem of inferring failed components given partial information of some `serviceable' reachable nodes and a small sample of point probes, being the first often more practical to obtain.

Distributed Representation of Subgraphs

no code implementations22 Feb 2017 Bijaya Adhikari, Yao Zhang, Naren Ramakrishnan, B. Aditya Prakash

Motivated by the recent successes of embeddings in natural language processing, researchers have tried to find network embeddings in order to exploit machine learning algorithms for mining tasks like node classification and edge prediction.

Community Detection Node Classification

Distributed Representations of Signed Networks

no code implementations22 Feb 2017 Mohammad Raihanul Islam, B. Aditya Prakash, Naren Ramakrishnan

Recent successes in word embedding and document embedding have motivated researchers to explore similar representations for networks and to use such representations for tasks such as edge prediction, node label prediction, and community detection.

Community Detection Document Embedding +1

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