Search Results for author: David Chapman

Found 10 papers, 1 papers with code

Semi-supervised Contrastive Outlier removal for Pseudo Expectation Maximization (SCOPE)

no code implementations28 Jun 2022 Sumeet Menon, David Chapman

Semi-supervised learning is the problem of training an accurate predictive model by combining a small labeled dataset with a presumably much larger unlabeled dataset.

Contrastive Learning

Mitigating domain shift in AI-based tuberculosis screening with unsupervised domain adaptation

no code implementations9 Nov 2021 Nishanjan Ravin, Sourajit Saha, Alan Schweitzer, Ameena Elahi, Farouk Dako, Daniel Mollura, David Chapman

We show that without domain adaptation, ResNet-50 has difficulty in generalizing between imaging distributions from a number of public Tuberculosis screening datasets with imagery from geographically distributed regions.

Specificity Unsupervised Domain Adaptation

CCS-GAN: COVID-19 CT-scan classification with very few positive training images

no code implementations1 Oct 2021 Sumeet Menon, Jayalakshmi Mangalagiri, Josh Galita, Michael Morris, Babak Saboury, Yaacov Yesha, Yelena Yesha, Phuong Nguyen, Aryya Gangopadhyay, David Chapman

CCS-GAN achieves high accuracy with few positive images and thereby greatly reduces the barrier of acquiring large training volumes in order to train a diagnostic classifier for COVID-19.

Generative Adversarial Network Style Transfer +1

Person Re-Identification with a Locally Aware Transformer

1 code implementation7 Jun 2021 Charu Sharma, Siddhant R. Kapil, David Chapman

At present, the majority of Person re-ID techniques are based on Convolutional Neural Networks (CNNs), but Vision Transformers are beginning to displace pure CNNs for a variety of object recognition tasks.

Object Recognition Person Re-Identification

Toward Generating Synthetic CT Volumes using a 3D-Conditional Generative Adversarial Network

no code implementations2 Apr 2021 Jayalakshmi Mangalagiri, David Chapman, Aryya Gangopadhyay, Yaacov Yesha, Joshua Galita, Sumeet Menon, Yelena Yesha, Babak Saboury, Michael Morris, Phuong Nguyen

We present a novel conditional Generative Adversarial Network (cGAN) architecture that is capable of generating 3D Computed Tomography scans in voxels from noisy and/or pixelated approximations and with the potential to generate full synthetic 3D scan volumes.

Denoising Generative Adversarial Network +1

Passive Encrypted IoT Device Fingerprinting with Persistent Homology

no code implementations NeurIPS Workshop TDA_and_Beyond 2020 Joe Collins, Michaela Iorga, Dmitry Cousin, David Chapman

Buttechniques to fingerprint devices based on inter-packet arrival time (IAT) are an important area of research, as this feature is available even in encrypted traffic. We demonstrate that Topological Data Analysis (TDA) using persistent homology over IAT packet windows is a viable approach to obtain discriminative features for device fingerprinting.

Topological Data Analysis

Deep Expectation-Maximization for Semi-Supervised Lung Cancer Screening

no code implementations2 Oct 2020 Sumeet Menon, David Chapman, Phuong Nguyen, Yelena Yesha, Michael Morris, Babak Saboury

We present a semi-supervised algorithm for lung cancer screening in which a 3D Convolutional Neural Network (CNN) is trained using the Expectation-Maximization (EM) meta-algorithm.

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