Search Results for author: Nilesh Ahuja

Found 12 papers, 2 papers with code

FRE: A Fast Method For Anomaly Detection And Segmentation

no code implementations23 Nov 2022 Ibrahima Ndiour, Nilesh Ahuja, Utku Genc, Omesh Tickoo

This paper presents a fast and principled approach for solving the visual anomaly detection and segmentation problem.

Anomaly Detection Dimensionality Reduction

A Low-Complexity Approach to Rate-Distortion Optimized Variable Bit-Rate Compression for Split DNN Computing

no code implementations24 Aug 2022 Parual Datta, Nilesh Ahuja, V. Srinivasa Somayazulu, Omesh Tickoo

Split computing has emerged as a recent paradigm for implementation of DNN-based AI workloads, wherein a DNN model is split into two parts, one of which is executed on a mobile/client device and the other on an edge-server (or cloud).

Data Compression

Robust Contrastive Active Learning with Feature-guided Query Strategies

no code implementations13 Sep 2021 Ranganath Krishnan, Nilesh Ahuja, Alok Sinha, Mahesh Subedar, Omesh Tickoo, Ravi Iyer

We introduce supervised contrastive active learning (SCAL) and propose efficient query strategies in active learning based on the feature similarity (featuresim) and principal component analysis based feature-reconstruction error (fre) to select informative data samples with diverse feature representations.

Active Learning Image Classification +1

Mitigating Sampling Bias and Improving Robustness in Active Learning

no code implementations13 Sep 2021 Ranganath Krishnan, Alok Sinha, Nilesh Ahuja, Mahesh Subedar, Omesh Tickoo, Ravi Iyer

This paper presents simple and efficient methods to mitigate sampling bias in active learning while achieving state-of-the-art accuracy and model robustness.

Active Learning

Energy-Based Anomaly Detection and Localization

no code implementations ICLR Workshop EBM 2021 Ergin Utku Genc, Nilesh Ahuja, Ibrahima J Ndiour, Omesh Tickoo

This brief sketches initial progress towards a unified energy-based solution for the semi-supervised visual anomaly detection and localization problem.

Anomaly Detection

Out-Of-Distribution Detection With Subspace Techniques And Probabilistic Modeling Of Features

no code implementations8 Dec 2020 Ibrahima Ndiour, Nilesh Ahuja, Omesh Tickoo

We also show that the feature reconstruction error, which is the $L_2$-norm of the difference between the original feature and the pre-image of its embedding, is highly effective for OOD detection and in some cases superior to the log-likelihood scores.

Dimensionality Reduction Out-of-Distribution Detection +1

Tree pyramidal adaptive importance sampling

no code implementations18 Dec 2019 Javier Felip, Nilesh Ahuja, Omesh Tickoo

After each new sample operation, a set of tree leaves are subdivided for improving the approximation of the proposal distribution to the target density.

Deep Probabilistic Models to Detect Data Poisoning Attacks

no code implementations3 Dec 2019 Mahesh Subedar, Nilesh Ahuja, Ranganath Krishnan, Ibrahima J. Ndiour, Omesh Tickoo

In the second approach, we use Bayesian deep neural networks trained with mean-field variational inference to estimate model uncertainty associated with the predictions.

Data Poisoning Variational Inference

Real-time Approximate Bayesian Computation for Scene Understanding

no code implementations22 May 2019 Javier Felip, Nilesh Ahuja, David Gómez-Gutiérrez, Omesh Tickoo, Vikash Mansinghka

The underlying generative models are built from realistic simulation software, wrapped in a Bayesian error model for the gap between simulation outputs and real data.

Scene Understanding

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