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Nikhil Mehta

16 accepted papers

2025

Apollo: An Exploration of Video Understanding in Large Multimodal Models

CVPR 2025poster

Despite the rapid integration of video perception capabilities into Large Multimodal Models (LMMs), what drives their video perception remains poorly understood. Consequently, many design decisions in this domain are made without proper justification or analysis. The high computational cost of train…

Cited by 25SourcePDFScholar
2025

Building a Mind Palace: Structuring Environment-Grounded Semantic Graphs for Effective Long Video Analysis with LLMs

CVPR 2025poster

Long-form video understanding with Large Vision Language Models is challenged by the need to analyze temporally dispersed yet spatially concentrated key moments within limited context windows. In this work, we introduce VideoMindPalace, a new framework inspired by the "Mind Palace", which organizes…

Cited by 1SourcePDFScholar
2025

Talking Point based Ideological Discourse Analysis in News Events

ACL 2025finding

Analyzing ideological discourse even in the age of LLMs remains a challenge, as these models often struggle to capture the key elements that shape real-world narratives. Specifically, LLMs fail to focus on characteristic elements driving dominant discourses and lack the ability to integrate contextu…

2025

Unleashing In-context Learning of Autoregressive Models for Few-shot Image Manipulation

CVPR 2025highlight

Text-guided image manipulation has experienced notable advancement in recent years. In order to mitigate linguistic ambiguity, few-shot learning with visual examples has been applied for instructions that are underrepresented in the training set, or difficult to describe purely in language. However,…

Cited by 3SourcePDFScholar
2024

Aligning Large Language Models with Recommendation Knowledge

NAACL 2024findings

Large language models (LLMs) have recently been used as backbones for recommender systems. However, their performance often lags behind conventional methods in standard tasks like retrieval. We attribute this to a mismatch between LLMs’ knowledge and the knowledge crucial for effective recommendatio…

2024

Assessing and Verifying Task Utility in LLM-Powered Applications

EMNLP 2024main

The rapid development of Large Language Models (LLMs) has led to a surge in applications that facilitate collaboration among multiple agents, assisting humans in their daily tasks. However, a significant gap remains in assessing to what extent LLM-powered applications genuinely enhance user experien…

2024

Using RL to Identify Divisive Perspectives Improves LLMs Abilities to Identify Communities on Social Media

EMNLP 2024finding

The large scale usage of social media, combined with its significant impact, has made it increasingly important to understand it. In particular, identifying user communities, can be helpful for many downstream tasks. However, particularly when models are trained on past data and tested on future, do…

Cited by 1SourcePDFScholar
2023

Recommender Systems with Generative Retrieval

NeurIPS 2023poster

Modern recommender systems perform large-scale retrieval by embedding queries and item candidates in the same unified space, followed by approximate nearest neighbor search to select top candidates given a query embedding. In this paper, we propose a novel generative retrieval approach, where the re…

Cited by 189SourcePDFScholar
2022

Tackling Fake News Detection by Continually Improving Social Context Representations using Graph Neural Networks

ACL 2022long

Easy access, variety of content, and fast widespread interactions are some of the reasons making social media increasingly popular. However, this rise has also enabled the propagation of fake news, text published by news sources with an intent to spread misinformation and sway beliefs. Detecting it…

2021

Continual Learning using a Bayesian Nonparametric Dictionary of Weight Factors

AISTATS 2021poster

Naively trained neural networks tend to experience catastrophic forgetting in sequential task settings, where data from previous tasks are unavailable. A number of methods, using various model expansion strategies, have been proposed recently as possible solutions. However, determining how much to e…

Cited by 41SourcePDFScholar
2021

Counterfactual Representation Learning with Balancing Weights

AISTATS 2021poster

A key to causal inference with observational data is achieving balance in predictive features associated with each treatment type. Recent literature has explored representation learning to achieve this goal. In this work, we discuss the pitfalls of these strategies – such as a steep trade-off betwee…

Cited by 89SourcePDFScholar
2021

Efficient Feature Transformations for Discriminative and Generative Continual Learning

CVPR 2021poster

As neural networks are increasingly being applied to real-world applications, mechanisms to address distributional shift and sequential task learning without forgetting are critical. Methods incorporating network expansion have shown promise by naturally adding model capacity for learning new tasks…

Cited by 90PDFcodeScholar