Search Results for author: Karthik Natarajan

Found 6 papers, 1 papers with code

CEHR-GPT: Generating Electronic Health Records with Chronological Patient Timelines

no code implementations6 Feb 2024 Chao Pang, Xinzhuo Jiang, Nishanth Parameshwar Pavinkurve, Krishna S. Kalluri, Elise L. Minto, Jason Patterson, Linying Zhang, George Hripcsak, Noémie Elhadad, Karthik Natarajan

Synthetic Electronic Health Records (EHR) have emerged as a pivotal tool in advancing healthcare applications and machine learning models, particularly for researchers without direct access to healthcare data.

counterfactual Counterfactual Reasoning +1

Submodularity, pairwise independence and correlation gap

no code implementations18 Sep 2022 Arjun Ramachandra, Karthik Natarajan

This contrasts with the $e/(e-1)$ bound on the correlation gap ratio for monotone submodular set functions with mutually independent random inputs (which is known to be tight in case (b)), and illustrates a fundamental difference in the behavior of submodular functions with weaker notions of independence.

4k

A Nonparametric Approach with Marginals for Modeling Consumer Choice

no code implementations12 Aug 2022 Yanqiu Ruan, Xiaobo Li, Karthyek Murthy, Karthik Natarajan

The marginal distribution model (MDM) is one such model, that requires only the specification of marginal distributions of the random utilities.

Prediction Intervals

Discrete Optimal Transport with Independent Marginals is #P-Hard

no code implementations2 Mar 2022 Bahar Taşkesen, Soroosh Shafieezadeh-Abadeh, Daniel Kuhn, Karthik Natarajan

We study the computational complexity of the optimal transport problem that evaluates the Wasserstein distance between the distributions of two K-dimensional discrete random vectors.

CEHR-BERT: Incorporating temporal information from structured EHR data to improve prediction tasks

no code implementations10 Nov 2021 Chao Pang, Xinzhuo Jiang, Krishna S Kalluri, Matthew Spotnitz, Ruijun Chen, Adler Perotte, Karthik Natarajan

CEHR-BERT also demonstrated strong transfer learning capability, as our model trained on only 5% of data outperformed comparison models trained on the entire data set.

Disease Prediction Transfer Learning

Correlation Robust Influence Maximization

1 code implementation NeurIPS 2020 Louis Chen, Divya Padmanabhan, Chee Chin Lim, Karthik Natarajan

We propose a distributionally robust model for the influence maximization problem.

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