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Senthil Purushwalkam

14 accepted papers

2025

DyMU: Dynamic Merging and Virtual Unmerging for Efficient Variable-Length VLMs

NeurIPS 2025poster

We present DyMU, an efficient, training-free framework that dynamically reduces the computational burden of vision-language models (VLMs) while maintaining high task performance. Our approach comprises two key components. First, Dynamic Token Merging (DToMe) reduces the number of visual token embedd…

Cited by 0SourceScholar
2025

FaithEval: Can Your Language Model Stay Faithful to Context, Even If "The Moon is Made of Marshmallows"

ICLR 2025poster

Ensuring faithfulness to context in large language models (LLMs) and retrieval-augmented generation (RAG) systems is crucial for reliable deployment in real-world applications, as incorrect or unsupported information can erode user trust. Despite advancements on standard benchmarks, faithfulness hal…

2025

Trust but Verify: Programmatic VLM Evaluation in the Wild

ICCV 2025poster

Vision-Language Models (VLMs) frequently hallucinate responses to visual queries, undermining their reliability for critical applications. However, quantifying the effect of such hallucinations in free-form responses to open-ended queries requires visually verifying each claim within the response, w…

Cited by 0SourcePDFScholar
2024

Diffusion Model Alignment Using Direct Preference Optimization

CVPR 2024poster

Large language models (LLMs) are fine-tuned using human comparison data with Reinforcement Learning from Human Feedback (RLHF) methods to make them better aligned with users' preferences. In contrast to LLMs human preference learning has not been widely explored in text-to-image diffusion models; th…

Cited by 205SourcePDFScholar
2023

ConRad: Image Constrained Radiance Fields for 3D Generation from a Single Image

NeurIPS 2023poster

We present a novel method for reconstructing 3D objects from a single RGB image. Our method leverages the latest image generation models to infer the hidden 3D structure while remaining faithful to the input image. While existing methods obtain impressive results in generating 3D models from text pr…

Cited by 6SourcePDFScholar
2022

The Unsurprising Effectiveness of Pre-Trained Vision Models for Control

ICML 2022oral

Recent years have seen the emergence of pre-trained representations as a powerful abstraction for AI applications in computer vision, natural language, and speech. However, policy learning for control is still dominated by a tabula-rasa learning paradigm, with visuo-motor policies often trained from…

2021

Audio-Visual Floorplan Reconstruction

ICCV 2021poster

Given only a few glimpses of an environment, how much can we infer about its entire floorplan? Existing methods can map only what is visible or immediately apparent from context, and thus require substantial movements through a space to fully map it. We explore how both audio and visual sensing toge…

Cited by 57PDFScholar
2020

Demystifying Contrastive Self-Supervised Learning: Invariances, Augmentations and Dataset Biases

NeurIPS 2020poster

Self-supervised representation learning approaches have recently surpassed their supervised learning counterparts on downstream tasks like object detection and image classification. Somewhat mysteriously the recent gains in performance come from training instance classification models, treating each…

Cited by 260SourcePDFScholar
2019

Bounce and Learn: Modeling Scene Dynamics with Real-World Bounces

ICLR 2019poster

We introduce an approach to model surface properties governing bounces in everyday scenes. Our model learns end-to-end, starting from sensor inputs, to predict post-bounce trajectories and infer two underlying physical properties that govern bouncing - restitution and effective collision normals. O…

Cited by 26SourcePDFScholar
2019

Task-Driven Modular Networks for Zero-Shot Compositional Learning

ICCV 2019poster

One of the hallmarks of human intelligence is the ability to compose learned knowledge into novel concepts which can be recognized without a single training example. In contrast, current state-of-the-art methods require hundreds of training examples for each possible category to build reliable and a…

Cited by 219PDFScholar