Search Results for author: Nikhil Mehta

Found 24 papers, 6 papers with code

Tackling Fake News Detection by Interactively Learning Representations using Graph Neural Networks

no code implementations ACL (InterNLP) 2021 Nikhil Mehta, Dan Goldwasser

Easy access, variety of content, and fast widespread interactions are some of the reasons that have made social media increasingly popular in today’s society.

Fake News Detection Misinformation

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

1 code implementation ACL 2022 Nikhil Mehta, Maria Pacheco, Dan Goldwasser

We view fake news detection as reasoning over the relations between sources, articles they publish, and engaging users on social media in a graph framework.

Fake News Detection Misinformation

Aligning Large Language Models with Recommendation Knowledge

no code implementations30 Mar 2024 Yuwei Cao, Nikhil Mehta, Xinyang Yi, Raghunandan Keshavan, Lukasz Heldt, Lichan Hong, Ed H. Chi, Maheswaran Sathiamoorthy

Operations such as Masked Item Modeling (MIM) and Bayesian Personalized Ranking (BPR) have found success in conventional recommender systems.

Attribute Recommendation Systems +1

HyperMix: Out-of-Distribution Detection and Classification in Few-Shot Settings

no code implementations22 Dec 2023 Nikhil Mehta, Kevin J Liang, Jing Huang, Fu-Jen Chu, Li Yin, Tal Hassner

Out-of-distribution (OOD) detection is an important topic for real-world machine learning systems, but settings with limited in-distribution samples have been underexplored.

Out-of-Distribution Detection Out of Distribution (OOD) Detection

Meta-Learned Attribute Self-Interaction Network for Continual and Generalized Zero-Shot Learning

no code implementations2 Dec 2023 Vinay K Verma, Nikhil Mehta, Kevin J Liang, Aakansha Mishra, Lawrence Carin

Zero-shot learning (ZSL) is a promising approach to generalizing a model to categories unseen during training by leveraging class attributes, but challenges remain.

Attribute Generalized Zero-Shot Learning +1

Interactively Learning Social Media Representations Improves News Source Factuality Detection

1 code implementation26 Sep 2023 Nikhil Mehta, Dan Goldwasser

The rise of social media has enabled the widespread propagation of fake news, text that is published with an intent to spread misinformation and sway beliefs.

Misinformation

An Interactive Framework for Profiling News Media Sources

no code implementations14 Sep 2023 Nikhil Mehta, Dan Goldwasser

The recent rise of social media has led to the spread of large amounts of fake and biased news, content published with the intent to sway beliefs.

Density Weighting for Multi-Interest Personalized Recommendation

no code implementations3 Aug 2023 Nikhil Mehta, Anima Singh, Xinyang Yi, Sagar Jain, Lichan Hong, Ed H. Chi

When the data distribution is highly skewed, the gains observed by learning multiple representations diminish since the model dominates on head items/interests, leading to poor performance on tail items.

Recommendation Systems

Better Generalization with Semantic IDs: A case study in Ranking for Recommendations

no code implementations13 Jun 2023 Anima Singh, Trung Vu, Raghunandan Keshavan, Nikhil Mehta, Xinyang Yi, Lichan Hong, Lukasz Heldt, Li Wei, Ed Chi, Maheswaran Sathiamoorthy

We showcase how we use them as a replacement of item IDs in a resource-constrained ranking model used in an industrial-scale video sharing platform.

Recommendation Systems

Do LLMs Understand User Preferences? Evaluating LLMs On User Rating Prediction

no code implementations10 May 2023 Wang-Cheng Kang, Jianmo Ni, Nikhil Mehta, Maheswaran Sathiamoorthy, Lichan Hong, Ed Chi, Derek Zhiyuan Cheng

In this paper, we conduct a thorough examination of both CF and LLMs within the classic task of user rating prediction, which involves predicting a user's rating for a candidate item based on their past ratings.

Collaborative Filtering World Knowledge

Improving Grounded Language Understanding in a Collaborative Environment by Interacting with Agents Through Help Feedback

no code implementations21 Apr 2023 Nikhil Mehta, Milagro Teruel, Patricio Figueroa Sanz, Xin Deng, Ahmed Hassan Awadallah, Julia Kiseleva

We explore multiple types of help players can give to the AI to guide it and analyze the impact of this help in AI behavior, resulting in performance improvements.

Pushing the Efficiency Limit Using Structured Sparse Convolutions

no code implementations23 Oct 2022 Vinay Kumar Verma, Nikhil Mehta, Shijing Si, Ricardo Henao, Lawrence Carin

Weight pruning is among the most popular approaches for compressing deep convolutional neural networks.

Pseudo-OOD training for robust language models

no code implementations17 Oct 2022 Dhanasekar Sundararaman, Nikhil Mehta, Lawrence Carin

The model is fine-tuned by introducing a new regularization loss that separates the embeddings of IND and OOD data, which leads to significant gains on the OOD prediction task during testing.

Out of Distribution (OOD) Detection

A two-step machine learning approach for crop disease detection: an application of GAN and UAV technology

no code implementations19 Sep 2021 Aaditya Prasad, Nikhil Mehta, Matthew Horak, Wan D. Bae

Two data-generators are also used to minimize class imbalance in the high-fidelity dataset and to produce low-fidelity data that is representative of UAV images.

BIG-bench Machine Learning

Efficient Feature Transformations for Discriminative and Generative Continual Learning

1 code implementation CVPR 2021 Vinay Kumar Verma, Kevin J Liang, Nikhil Mehta, Piyush Rai, Lawrence Carin

However, the growth in the number of additional parameters of many of these types of methods can be computationally expensive at larger scales, at times prohibitively so.

Continual Learning

Meta-Learned Attribute Self-Gating for Continual Generalized Zero-Shot Learning

no code implementations23 Feb 2021 Vinay Kumar Verma, Kevin Liang, Nikhil Mehta, Lawrence Carin

Zero-shot learning (ZSL) has been shown to be a promising approach to generalizing a model to categories unseen during training by leveraging class attributes, but challenges still remain.

Attribute Generalized Zero-Shot Learning +1

Counterfactual Representation Learning with Balancing Weights

no code implementations23 Oct 2020 Serge Assaad, Shuxi Zeng, Chenyang Tao, Shounak Datta, Nikhil Mehta, Ricardo Henao, Fan Li, Lawrence Carin

A key to causal inference with observational data is achieving balance in predictive features associated with each treatment type.

Causal Inference counterfactual +1

WAFFLe: Weight Anonymized Factorization for Federated Learning

no code implementations13 Aug 2020 Weituo Hao, Nikhil Mehta, Kevin J Liang, Pengyu Cheng, Mostafa El-Khamy, Lawrence Carin

Experiments on MNIST, FashionMNIST, and CIFAR-10 demonstrate WAFFLe's significant improvement to local test performance and fairness while simultaneously providing an extra layer of security.

Fairness Federated Learning

Continual Learning using a Bayesian Nonparametric Dictionary of Weight Factors

no code implementations21 Apr 2020 Nikhil Mehta, Kevin J Liang, Vinay K Verma, Lawrence Carin

Naively trained neural networks tend to experience catastrophic forgetting in sequential task settings, where data from previous tasks are unavailable.

Continual Learning Transfer Learning

Graph Representation Learning via Ladder Gamma Variational Autoencoders

1 code implementation3 Apr 2020 Arindam Sarkar, Nikhil Mehta, Piyush Rai

In addition to leveraging the representational power of multiple layers of stochastic variables via the ladder VAE architecture, our framework offers the following benefits: (1) Unlike existing ladder VAE architectures based on real-valued latent variables, the gamma-distributed latent variables naturally result in non-negativity and sparsity of the learned embeddings, and facilitate their direct interpretation as membership of nodes into (possibly multiple) communities/topics; (2) A novel recognition model for our gamma ladder VAE architecture allows fast inference of node embeddings; and (3) The framework also extends naturally to incorporate node side information (features and/or labels).

Graph Representation Learning Link Prediction

Survival Cluster Analysis

1 code implementation29 Feb 2020 Paidamoyo Chapfuwa, Chunyuan Li, Nikhil Mehta, Lawrence Carin, Ricardo Henao

As a result, there is an unmet need in survival analysis for identifying subpopulations with distinct risk profiles, while jointly accounting for accurate individualized time-to-event predictions.

Survival Analysis

Stochastic Blockmodels meet Graph Neural Networks

no code implementations Proceedings of the 36th International Conference on Machine Learning 2019 Nikhil Mehta, Lawrence Carin, Piyush Rai

Although we develop this framework for a particular type of SBM, namely the \emph{overlapping} stochastic blockmodel, the proposed framework can be adapted readily for other types of SBMs.

Link Prediction

Improving Natural Language Interaction with Robots Using Advice

1 code implementation NAACL 2019 Nikhil Mehta, Dan Goldwasser

Over the last few years, there has been growing interest in learning models for physically grounded language understanding tasks, such as the popular blocks world domain.

Deep Topic Models for Multi-label Learning

no code implementations13 Apr 2019 Rajat Panda, Ankit Pensia, Nikhil Mehta, Mingyuan Zhou, Piyush Rai

We present a probabilistic framework for multi-label learning based on a deep generative model for the binary label vector associated with each observation.

Multi-Label Learning Topic Models

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