Search Results for author: Anuj Karpatne

Found 31 papers, 15 papers with code

Knowledge-guided Machine Learning: Current Trends and Future Prospects

no code implementations24 Mar 2024 Anuj Karpatne, Xiaowei Jia, Vipin Kumar

We discuss different facets of KGML research in terms of the type of scientific knowledge used, the form of knowledge-ML integration explored, and the method for incorporating scientific knowledge in ML.

A Simple Interpretable Transformer for Fine-Grained Image Classification and Analysis

1 code implementation7 Nov 2023 Dipanjyoti Paul, Arpita Chowdhury, Xinqi Xiong, Feng-Ju Chang, David Carlyn, Samuel Stevens, Kaiya Provost, Anuj Karpatne, Bryan Carstens, Daniel Rubenstein, Charles Stewart, Tanya Berger-Wolf, Yu Su, Wei-Lun Chao

Unlike mainstream classifiers that wait until the last fully-connected layer to incorporate class information to make predictions, we investigate a proactive approach, asking each class to search for itself in an image.

Fine-Grained Image Classification

MEMTRACK: A Deep Learning-Based Approach to Microrobot Tracking in Dense and Low-Contrast Environments

1 code implementation13 Oct 2023 Medha Sawhney, Bhas Karmarkar, Eric J. Leaman, Arka Daw, Anuj Karpatne, Bahareh Behkam

Herein, we report Motion Enhanced Multi-level Tracker (MEMTrack), a robust pipeline for detecting and tracking microrobots using synthetic motion features, deep learning-based object detection, and a modified Simple Online and Real-time Tracking (SORT) algorithm with interpolation for tracking.

object-detection Object Detection

Neuro-Visualizer: An Auto-encoder-based Loss Landscape Visualization Method

no code implementations26 Sep 2023 Mohannad Elhamod, Anuj Karpatne

In recent years, there has been a growing interest in visualizing the loss landscape of neural networks.

Beyond Discriminative Regions: Saliency Maps as Alternatives to CAMs for Weakly Supervised Semantic Segmentation

no code implementations21 Aug 2023 M. Maruf, Arka Daw, Amartya Dutta, Jie Bu, Anuj Karpatne

Furthermore, we propose random cropping as a stochastic aggregation technique that improves the performance of saliency, making it a strong alternative to CAM for WS3.

Segmentation Weakly supervised Semantic Segmentation +1

Let There Be Order: Rethinking Ordering in Autoregressive Graph Generation

1 code implementation24 May 2023 Jie Bu, Kazi Sajeed Mehrab, Anuj Karpatne

Conditional graph generation tasks involve training a model to generate a graph given a set of input conditions.

Dimensionality Reduction Graph Generation

Multi-task Learning for Source Attribution and Field Reconstruction for Methane Monitoring

no code implementations2 Nov 2022 Arka Daw, Kyongmin Yeo, Anuj Karpatne, Levente Klein

Inferring the source information of greenhouse gases, such as methane, from spatially sparse sensor observations is an essential element in mitigating climate change.

Multi-Task Learning

Mitigating Propagation Failures in Physics-informed Neural Networks using Retain-Resample-Release (R3) Sampling

1 code implementation5 Jul 2022 Arka Daw, Jie Bu, Sifan Wang, Paris Perdikaris, Anuj Karpatne

In this paper, we provide a novel perspective of failure modes of PINNs by hypothesizing that training PINNs relies on successful "propagation" of solution from initial and/or boundary condition points to interior points.

Physics-Guided Problem Decomposition for Scaling Deep Learning of High-dimensional Eigen-Solvers: The Case of Schrödinger's Equation

no code implementations12 Feb 2022 Sangeeta Srivastava, Samuel Olin, Viktor Podolskiy, Anuj Karpatne, Wei-Cheng Lee, Anish Arora

Unfortunately, for the learned models in these scientific applications to achieve generalization, a large, diverse, and preferably annotated dataset is typically needed and is computationally expensive to obtain.

Problem Decomposition

Adjoint-Matching Neural Network Surrogates for Fast 4D-Var Data Assimilation

no code implementations16 Nov 2021 Austin Chennault, Andrey A. Popov, Amit N. Subrahmanya, Rachel Cooper, Ali Haisam Muhammad Rafid, Anuj Karpatne, Adrian Sandu

Surrogates constructed using adjoint information demonstrate superior performance on the 4D-Var data assimilation problem compared to a standard neural network surrogate that uses only forward dynamics information.

Weather Forecasting

PID-GAN: A GAN Framework based on a Physics-informed Discriminator for Uncertainty Quantification with Physics

1 code implementation6 Jun 2021 Arka Daw, M. Maruf, Anuj Karpatne

In scientific applications, it is also important to inform the learning of DL models with knowledge of physics of the problem to produce physically consistent and generalized solutions.

Uncertainty Quantification

A Data-Driven Approach to Full-Field Damage and Failure Pattern Prediction in Microstructure-Dependent Composites using Deep Learning

no code implementations9 Apr 2021 Reza Sepasdar, Anuj Karpatne, Maryam Shakiba

The proposed deep learning framework predicts the post-failure full-field stress distribution and crack pattern in two-dimensional representations of the composites based on the geometry of microstructures.

Quadratic Residual Networks: A New Class of Neural Networks for Solving Forward and Inverse Problems in Physics Involving PDEs

1 code implementation20 Jan 2021 Jie Bu, Anuj Karpatne

We propose quadratic residual networks (QRes) as a new type of parameter-efficient neural network architecture, by adding a quadratic residual term to the weighted sum of inputs before applying activation functions.

Efficient Neural Network

GCNNMatch: Graph Convolutional Neural Networks for Multi-Object Tracking via Sinkhorn Normalization

2 code implementations30 Sep 2020 Ioannis Papakis, Abhijit Sarkar, Anuj Karpatne

This new paradigm enables the network to leverage the "context" information of the geometry of objects and allows us to model the interactions among the features of multiple objects.

Multi-Object Tracking Object +1

CoPhy-PGNN: Learning Physics-guided Neural Networks with Competing Loss Functions for Solving Eigenvalue Problems

1 code implementation2 Jul 2020 Mohannad Elhamod, Jie Bu, Christopher Singh, Matthew Redell, Abantika Ghosh, Viktor Podolskiy, Wei-Cheng Lee, Anuj Karpatne

Physics-guided Neural Networks (PGNNs) represent an emerging class of neural networks that are trained using physics-guided (PG) loss functions (capturing violations in network outputs with known physics), along with the supervision contained in data.

Maximizing Cohesion and Separation in Graph Representation Learning: A Distance-aware Negative Sampling Approach

1 code implementation2 Jul 2020 M. Maruf, Anuj Karpatne

Existing algorithms for this task rely on negative sampling objectives that maximize the similarity in node embeddings at nearby nodes (referred to as "cohesion") by maintaining positive and negative corpus of node pairs.

Graph Representation Learning Node Classification

Physics-Guided Machine Learning for Scientific Discovery: An Application in Simulating Lake Temperature Profiles

no code implementations28 Jan 2020 Xiaowei Jia, Jared Willard, Anuj Karpatne, Jordan S. Read, Jacob A Zwart, Michael Steinbach, Vipin Kumar

Specifically, we show that a PGRNN can improve prediction accuracy over that of physics-based models, while generating outputs consistent with physical laws.

BIG-bench Machine Learning

Physics-guided Design and Learning of Neural Networks for Predicting Drag Force on Particle Suspensions in Moving Fluids

1 code implementation6 Nov 2019 Nikhil Muralidhar, Jie Bu, Ze Cao, Long He, Naren Ramakrishnan, Danesh Tafti, Anuj Karpatne

In such situations, it is often useful to rely on machine learning methods to fill in the gap by learning a model of the complex physical process directly from simulation data.

Physics-Guided Architecture (PGA) of Neural Networks for Quantifying Uncertainty in Lake Temperature Modeling

1 code implementation6 Nov 2019 Arka Daw, R. Quinn Thomas, Cayelan C. Carey, Jordan S. Read, Alison P. Appling, Anuj Karpatne

To simultaneously address the rising need of expressing uncertainties in deep learning models along with producing model outputs which are consistent with the known scientific knowledge, we propose a novel physics-guided architecture (PGA) of neural networks in the context of lake temperature modeling where the physical constraints are hard coded in the neural network architecture.

Uncertainty Quantification

A Fast-Optimal Guaranteed Algorithm For Learning Sub-Interval Relationships in Time Series

no code implementations3 Jun 2019 Saurabh Agrawal, Saurabh Verma, Anuj Karpatne, Stefan Liess, Snigdhansu Chatterjee, Vipin Kumar

Traditional approaches focus on finding relationships between two entire time series, however, many interesting relationships exist in small sub-intervals of time and remain feeble during other sub-intervals.

Time Series Time Series Analysis

Physics Guided RNNs for Modeling Dynamical Systems: A Case Study in Simulating Lake Temperature Profiles

no code implementations31 Oct 2018 Xiaowei Jia, Jared Willard, Anuj Karpatne, Jordan Read, Jacob Zwart, Michael Steinbach, Vipin Kumar

This paper proposes a physics-guided recurrent neural network model (PGRNN) that combines RNNs and physics-based models to leverage their complementary strengths and improve the modeling of physical processes.

Physics Guided Recurrent Neural Networks For Modeling Dynamical Systems: Application to Monitoring Water Temperature And Quality In Lakes

no code implementations5 Oct 2018 Xiaowei Jia, Anuj Karpatne, Jared Willard, Michael Steinbach, Jordan Read, Paul C Hanson, Hilary A Dugan, Vipin Kumar

In this paper, we introduce a novel framework for combining scientific knowledge within physics-based models and recurrent neural networks to advance scientific discovery in many dynamical systems.

Mining Sub-Interval Relationships In Time Series Data

no code implementations16 Feb 2018 Saurabh Agrawal, Saurabh Verma, Gowtham Atluri, Anuj Karpatne, Stefan Liess, Angus Macdonald III, Snigdhansu Chatterjee, Vipin Kumar

In this paper, we define the notion of a sub-interval relationship (SIR) to capture inter- actions between two time series that are prominent only in certain sub-intervals of time.

Computational Efficiency Time Series +1

Discovery of Shifting Patterns in Sequence Classification

no code implementations19 Dec 2017 Xiaowei Jia, Ankush Khandelwal, Anuj Karpatne, Vipin Kumar

The experiments demonstrate the superiority of our proposed method in sequence classification performance and in detecting discriminative shifting patterns.

Classification General Classification

ORBIT: Ordering Based Information Transfer Across Space and Time for Global Surface Water Monitoring

no code implementations15 Nov 2017 Ankush Khandelwal, Anuj Karpatne, Vipin Kumar

Various data fusion methods have been proposed in the literature that mainly rely on individual timesteps when both datasets are available to learn a mapping between features values at different resolutions using local relationships between pixels.

Earth Observation

Machine Learning for the Geosciences: Challenges and Opportunities

no code implementations13 Nov 2017 Anuj Karpatne, Imme Ebert-Uphoff, Sai Ravela, Hassan Ali Babaie, Vipin Kumar

Geosciences is a field of great societal relevance that requires solutions to several urgent problems facing our humanity and the planet.

BIG-bench Machine Learning

Spatio-Temporal Data Mining: A Survey of Problems and Methods

1 code implementation13 Nov 2017 Gowtham Atluri, Anuj Karpatne, Vipin Kumar

Large volumes of spatio-temporal data are increasingly collected and studied in diverse domains including, climate science, social sciences, neuroscience, epidemiology, transportation, mobile health, and Earth sciences.

Anomaly Detection Change Detection +2

Physics-guided Neural Networks (PGNN): An Application in Lake Temperature Modeling

2 code implementations31 Oct 2017 Arka Daw, Anuj Karpatne, William Watkins, Jordan Read, Vipin Kumar

This paper introduces a framework for combining scientific knowledge of physics-based models with neural networks to advance scientific discovery.

Theory-guided Data Science: A New Paradigm for Scientific Discovery from Data

no code implementations27 Dec 2016 Anuj Karpatne, Gowtham Atluri, James Faghmous, Michael Steinbach, Arindam Banerjee, Auroop Ganguly, Shashi Shekhar, Nagiza Samatova, Vipin Kumar

Theory-guided data science (TGDS) is an emerging paradigm that aims to leverage the wealth of scientific knowledge for improving the effectiveness of data science models in enabling scientific discovery.

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