Search Results for author: Swapnil Mishra

Found 14 papers, 7 papers with code

The interaction of transmission intensity, mortality, and the economy: a retrospective analysis of the COVID-19 pandemic

no code implementations31 Oct 2022 Christian Morgenstern, Daniel J. Laydon, Charles Whittaker, Swapnil Mishra, David Haw, Samir Bhatt, Neil M. Ferguson

For example, more developed countries in Europe typically had more cautious approaches to the COVID-19 pandemic, prioritising healthcare, and excess deaths over economic performance.

Cox-Hawkes: doubly stochastic spatiotemporal Poisson processes

no code implementations21 Oct 2022 Xenia Miscouridou, Samir Bhatt, George Mohler, Seth Flaxman, Swapnil Mishra

Here we develop a new class of spatiotemporal Hawkes processes that can capture both triggering and clustering behavior and we provide an efficient method for performing inference.

PriorVAE: Encoding spatial priors with VAEs for small-area estimation

1 code implementation20 Oct 2021 Elizaveta Semenova, Yidan Xu, Adam Howes, Theo Rashid, Samir Bhatt, Swapnil Mishra, Seth Flaxman

Gaussian processes (GPs), implemented through multivariate Gaussian distributions for a finite collection of data, are the most popular approach in small-area spatial statistical modelling.

Gaussian Processes

Unifying incidence and prevalence under a time-varying general branching process

1 code implementation12 Jul 2021 Mikko S. Pakkanen, Xenia Miscouridou, Matthew J. Penn, Charles Whittaker, Tresnia Berah, Swapnil Mishra, Thomas A. Mellan, Samir Bhatt

We also show that the incidence integral equations that arise from both of these specific models agree with the renewal equation used ubiquitously in infectious disease modelling.

Epidemiology Probabilistic Programming

Gaussian Process Nowcasting: Application to COVID-19 Mortality Reporting

1 code implementation22 Feb 2021 Iwona Hawryluk, Henrique Hoeltgebaum, Swapnil Mishra, Xenia Miscouridou, Ricardo P Schnekenberg, Charles Whittaker, Michaela Vollmer, Seth Flaxman, Samir Bhatt, Thomas A Mellan

An important example of this problem is the nowcasting of COVID-19 mortality: given a stream of reported counts of daily deaths, can we correct for the delays in reporting to paint an accurate picture of the present, with uncertainty?

Referenced Thermodynamic Integration for Bayesian Model Selection: Application to COVID-19 Model Selection

1 code implementation8 Sep 2020 Iwona Hawryluk, Swapnil Mishra, Seth Flaxman, Samir Bhatt, Thomas A. Mellan

The approach is shown to be useful in practice when applied to a real problem - to perform model selection for a semi-mechanistic hierarchical Bayesian model of COVID-19 transmission in South Korea involving the integration of a 200D density.

Benchmarking Epidemiology +1

A unified machine learning approach to time series forecasting applied to demand at emergency departments

no code implementations13 Jul 2020 Michaela A. C. Vollmer, Ben Glampson, Thomas A. Mellan, Swapnil Mishra, Luca Mercuri, Ceire Costello, Robert Klaber, Graham Cooke, Seth Flaxman, Samir Bhatt

We find that linear models often outperform machine learning methods and that the quality of our predictions for any of the forecasting horizons of 1, 3 or 7 days are comparable as measured in MAE.

BIG-bench Machine Learning Time Series +1

$π$VAE: a stochastic process prior for Bayesian deep learning with MCMC

2 code implementations17 Feb 2020 Swapnil Mishra, Seth Flaxman, Tresnia Berah, Harrison Zhu, Mikko Pakkanen, Samir Bhatt

We show that our framework can accurately learn expressive function classes such as Gaussian processes, but also properties of functions to enable statistical inference (such as the integral of a log Gaussian process).

Computational Efficiency Gaussian Processes +2

Modeling Popularity in Asynchronous Social Media Streams with Recurrent Neural Networks

no code implementations6 Apr 2018 Swapnil Mishra, Marian-Andrei Rizoiu, Lexing Xie

We find that results depend on the type of content being promoted: superusers are more successful in promoting Howto and Gaming videos, whereas the cohort of regular users are more influential for Activism videos.

A Tutorial on Hawkes Processes for Events in Social Media

no code implementations21 Aug 2017 Marian-Andrei Rizoiu, Young Lee, Swapnil Mishra, Lexing Xie

This chapter provides an accessible introduction for point processes, and especially Hawkes processes, for modeling discrete, inter-dependent events over continuous time.

Point Processes

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