Nupur Kumari

I am a final year PhD student at Robotics Institute, Carnegie Mellon University (CMU). I am advised by Jun-Yan Zhu and collaborate closely with Richard Zhang and Eli Shechtman. My research interests lie in computer vision, specifically, generative models, model customization, and post-training techniques.

Prior to CMU, I worked at Media and Data Science Research, Adobe India, and had the pleasure to collaborate with Vineeth N Balasubramanian during that time. I did my undergraduate from Indian Institute of Tenchnology Delhi with a major in Mathematics and Computing.

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NP-Edit: Learning an Image Editing Model without Image Editing Pairs
Nupur Kumari, Sheng-Yu Wang, Nanxuan Zhao, Yotam Nitzan, Yuheng Li, Krishna Kumar Singh, Richard Zhang, Eli Shechtman, Jun-Yan Zhu, Xun Huang

We propose NP-Edit (No-Pair Edit), a framework for training image editing models using gradient feedback from a Vision–Language Model (VLM), requiring no paired supervision. Our formulation combines VLM feedback with distribution matching loss to learn a few-step image editing model. We show that performance improves directly with more powerful VLMs and larger datasets, demonstrating its strong potential and scalability.

Generating Multi-Image Synthetic Data for Text-to-Image Customization
Nupur Kumari, Xi Yin, Jun-Yan Zhu,Ishan Misra, Samaneh Azadi

We propose a data generation pipeline for image customization consisting of multiple images of the same object in different contexts. Given the training data, we train a new encoder-based model for the task, which can successfully generate new compositions of a reference object using text prompts.

Generative Photomontage
Sean J. Liu, Nupur Kumari, Ariel Shamir, Jun-Yan Zhu

We propose a framework for creating the desired image by compositing it from various parts of generated images, in essence forming a Generative Photomontage.

Customizing Text- to-Image Diffusion with Object Viewpoint Control
Nupur Kumari^*, Grace Su^*, Richard Zhang, Taesung Park, Eli Shechtman, Jun-Yan Zhu

We propose Custom Diffusion-360, to add object viewpoint control when personalizing text-to-image diffusion models, e.g. Stable Diffusion-XL, given multi-view images of the new object.

Customizing Text-to-Image Models with a Single Image Pair
Maxwell Jones, Sheng-Yu Wang, Nupur Kumari, David Bau, Jun-Yan Zhu

We propose PairCustomization, a method to learn new style concepts from a single image pair by decomposing style and content.

Multi-Concept Customization of Text-to-Image Diffusion
Nupur Kumari, Bingliang Zhang, Richard Zhang, Eli Shechtman, Jun-Yan Zhu

We propose Custom Diffusion, a method to fine-tune large-scale text-to-image diffusion models, e.g. Stable Diffusion, given few (~4-20) user-provided images of a new concept. Our method is computationally efficient (~6 minutes on 2 A100 GPUs) and has low storage requirements for each additional concept model (75MB) apart from the pretrained model.

Ablating Concepts in Text-to-Image Diffusion Models
Nupur Kumari, Bingliang Zhang, Sheng-Yu Wang, Eli Shechtman, Richard Zhang, Jun-Yan Zhu

We propose a method to ablate (remove) copyrighted materials and memorized images from pretrained text-to-image generative models. Our algorithm changes the target concept distribution to an anchor concept, e.g., Van Gogh painting to paintings or Grumpy cat to Cat.

Content-Based Search for Deep Generative Models
Daohan Lu*, Sheng-Yu Wang*, Nupur Kumari*, Rohan Agarwal*, Mia Tang, David Bau, Jun-Yan Zhu

We propose an algorithm for searching over generative models using image,text, and sketch. Our search platform is available at Modelverse.

Ensembling Off-the-shelf Models for GAN Training
Nupur Kumari, Richard Zhang, Eli Shechtman, Jun-Yan Zhu

We show that pretrained computer vision models can significantly improve performance when used in an ensemble of discriminators. Our method improves FID by 1.5x to 2x on cat, church, and horse categories of LSUN.

Attributional Robustness Training using Input-Gradient Spatial Alignment
Nupur Kumari^*, Mayank Singh^*, Puneet Mangla, Abhishek Sinha, Vineeth N Balasubramanian, Balaji Krishnamurthy

We propose a robust attribution training methodology ART that maximizes the alignment between the input and its attribution map. ART achieves state-of-the-art performance in attributional robustness and weakly supervised object localization on CUB dataset.

Charting the Right Manifold: Manifold Mixup for Few-shot Learning
Puneet Mangla^*, Nupur Kumari^*, Abhishek Sinha^*, Mayank Singh^*, Vineeth N Balasubramanian, Balaji Krishnamurthy

Used self-supervision techniques - rotation and exemplar, followed by manifold mixup for few-shot classification tasks. The proposed approach beats the current state-of-the-art accuracy on mini-ImageNet, CUB and CIFAR-FS datasets by 3-8%.

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