← Search

Ayan Chakrabarti

18 accepted papers

2025

Analyzing Similarity Metrics for Data Selection for Language Model Pretraining

NeurIPS 2025poster

Measuring similarity between training examples is critical for curating high-quality and diverse pretraining datasets for language models. However, similarity is typically computed with a generic off-the-shelf embedding model that has been trained for tasks such as retrieval. Whether these embeddi…

Cited by 0SourceScholar
2024

MarkovGen: Structured Prediction for Efficient Text-to-Image Generation

CVPR 2024poster

Modern text-to-image generation models produce high-quality images that are both photorealistic and faithful to the text prompts. However this quality comes at significant computational cost: nearly all of these models are iterative and require running sampling multiple times with large models. This…

Cited by 2SourcePDFScholar
2024

Rethinking FID: Towards a Better Evaluation Metric for Image Generation

CVPR 2024highlight

As with many machine learning problems the progress of image generation methods hinges on good evaluation metrics. One of the most popular is the Frechet Inception Distance (FID). FID estimates the distance between a distribution of Inception-v3 features of real images and those of images generated…

2023

Benchmarking Robustness to Adversarial Image Obfuscations

NeurIPS 2023poster

Automated content filtering and moderation is an important tool that allows online platforms to build striving user communities that facilitate cooperation and prevent abuse. Unfortunately, resourceful actors try to bypass automated filters in a bid to post content that violate platform policies and…

2021

Deep Denoising of Flash and No-Flash Pairs for Photography in Low-Light Environments

CVPR 2021poster

We introduce a neural network-based method to denoise pairs of images taken in quick succession in low-light environments, with and without a flash. Our goal is to produce a high-quality rendering of the scene that preserves the color and mood from the ambient illumination of the noisy no-flash imag…

Cited by 25PDFScholar
2021

Understanding Robustness of Transformers for Image Classification

ICCV 2021poster

Deep Convolutional Neural Networks (CNNs) have long been the architecture of choice for computer vision tasks. Recently, Transformer-based architectures like Vision Transformer (ViT) have matched or even surpassed ResNets for image classification. However, details of the Transformer architecture suc…

Cited by 503PDFScholar
2020

Basis Prediction Networks for Effective Burst Denoising With Large Kernels

CVPR 2020poster

Bursts of images exhibit significant self-similarity across both time and space. This motivates a representation of the kernels as linear combinations of a small set of basis elements. To this end, we introduce a novel basis prediction network that, given an input burst, predicts a set of global bas…

Cited by 86PDFScholar
2019

Backprop with Approximate Activations for Memory-efficient Network Training

NeurIPS 2019poster

Training convolutional neural network models is memory intensive since back-propagation requires storing activations of all intermediate layers. This presents a practical concern when seeking to deploy very deep architectures in production, especially when models need to be frequently re-trained on…

Cited by 44SourcePDFScholar
2019

Jointly Learning to Construct and Control Agents using Deep Reinforcement Learning

ICRA 2019poster

The physical design of a robot and the policy that controls its motion are inherently coupled, and should be determined according to the task and environment. In an increasing number of applications, data-driven and learning-based approaches, such as deep reinforcement learning, have proven effectiv…

Cited by 136SourceScholar
2019

Learning to Separate Multiple Illuminants in a Single Image

CVPR 2019poster

We present a method to separate a single image captured under two illuminants, with different spectra, into the two images corresponding to the appearance of the scene under each individual illuminant. We do this by training a deep neural network to predict the per-pixel reflectance chromaticity of…

Cited by 18PDFScholar
2018

Jointly Learning to Construct and Control Agents using Deep Reinforcement Learning

ICLR 2018workshop

The physical design of a robot and the policy that controls its motion are inherently coupled. However, existing approaches largely ignore this coupling, instead choosing to alternate between separate design and control phases, which requires expert intuition throughout and risks convergence to subo…

Cited by 134SourceScholar
2017

Jointly optimizing placement and inference for beacon-based localization

IROS 2017poster

The ability of robots to estimate their location is crucial for a wide variety of autonomous operations. In settings where GPS is unavailable, measurements of transmissions from fixed beacons provide an effective means of estimating a robot's location as it navigates. The accuracy of such a beacon-b…

Cited by 12SourceScholar
2016

Depth from a Single Image by Harmonizing Overcomplete Local Network Predictions

NeurIPS 2016poster

A single color image can contain many cues informative towards different aspects of local geometric structure. We approach the problem of monocular depth estimation by using a neural network to produce a mid-level representation that summarizes these cues. This network is trained to characterize loc…

Cited by 161SourcePDFScholar
2015

Low-Level Vision by Consensus in a Spatial Hierarchy of Regions

CVPR 2015poster

We introduce a multi-scale framework for low-level vision, where the goal is estimating physical scene values from image data---such as depth from stereo image pairs. The framework uses a dense, overlapping set of image regions at multiple scales and a ``local model,'' such as a slanted-plane model…

Cited by 47SourcePDFScholar