Search Results for author: Ritabrata Dutta

Found 18 papers, 9 papers with code

Likelihood-Free Inference with Generative Neural Networks via Scoring Rule Minimization

1 code implementation31 May 2022 Lorenzo Pacchiardi, Ritabrata Dutta

However, generative networks only allow sampling from the parametrized distribution; for this reason, Ramesh et al. [2022] follows the common solution of adversarial training, where the generative network plays a min-max game against a "critic" network.

Uncertainty Quantification

RSTGen: Imbuing Fine-Grained Interpretable Control into Long-FormText Generators

no code implementations NAACL 2022 Rilwan A. Adewoyin, Ritabrata Dutta, Yulan He

In this paper, we study the task of improving the cohesion and coherence of long-form text generated by language models.

Story Generation

Probabilistic Forecasting with Generative Networks via Scoring Rule Minimization

1 code implementation15 Dec 2021 Lorenzo Pacchiardi, Rilwan Adewoyin, Peter Dueben, Ritabrata Dutta

Adversarial-free minimization is possible for some scoring rules; hence, our framework avoids the cumbersome hyperparameter tuning and uncertainty underestimation due to unstable adversarial training, thus unlocking reliable use of generative networks in probabilistic forecasting.

Uncertainty Quantification Weather Forecasting

Score Matched Neural Exponential Families for Likelihood-Free Inference

2 code implementations20 Dec 2020 Lorenzo Pacchiardi, Ritabrata Dutta

Bayesian Likelihood-Free Inference (LFI) approaches allow to obtain posterior distributions for stochastic models with intractable likelihood, by relying on model simulations.

Bayesian Inference Time Series +1

High-resolution Probabilistic Precipitation Prediction for use in Climate Simulations

no code implementations17 Dec 2020 Sherman Lo, Peter Watson, Peter Dueben, Ritabrata Dutta

Here, we develop a method to make probabilistic precipitation predictions based on features that climate models can resolve well and that is not highly sensitive to the approximations used in individual models.

Computation Applications

TRU-NET: A Deep Learning Approach to High Resolution Prediction of Rainfall

1 code implementation20 Aug 2020 Rilwan Adewoyin, Peter Dueben, Peter Watson, Yulan He, Ritabrata Dutta

Experiments show that our model consistently attains lower RMSE and MAE scores than a DL model prevalent in short term precipitation prediction and improves upon the rainfall predictions of a state-of-the-art dynamical weather model.

Using mobility data in the design of optimal lockdown strategies for the COVID-19 pandemic in England

2 code implementations29 Jun 2020 Ritabrata Dutta, Susana Gomes, Dante Kalise, Lorenzo Pacchiardi

A mathematical model for the COVID-19 pandemic spread in England is presented.

Applications Physics and Society Populations and Evolution

Anomalous Platelet Transport & Fat-Tailed Distributions

1 code implementation21 Jun 2020 Christos Kotsalos, Karim Zouaoui Boudjeltia, Ritabrata Dutta, Jonas Latt, Bastien Chopard

The transport of platelets in blood is commonly assumed to obey an advection-diffusion equation.

Computational Physics Biological Physics

Distance-learning For Approximate Bayesian Computation To Model a Volcanic Eruption

1 code implementation28 Sep 2019 Lorenzo Pacchiardi, Pierre Kunzli, Marcel Schoengens, Bastien Chopard, Ritabrata Dutta

Using ABC, which depends on many simulations from the considered model, we develop an inferential framework to learn parameters of a stochastic numerical simulator of volcanic eruption.

Computation Applications

ABCpy: A High-Performance Computing Perspective to Approximate Bayesian Computation

1 code implementation13 Nov 2017 Ritabrata Dutta, Marcel Schoengens, Lorenzo Pacchiardi, Avinash Ummadisingu, Nicole Widmer, Jukka-Pekka Onnela, Antonietta Mira

Further, ABCpy enables ABC experts to easily develop new inference schemes and evaluate them in a standardized environment and to extend the library with new algorithms.

Computation

Bayesian Inference of Spreading Processes on Networks

no code implementations26 Sep 2017 Ritabrata Dutta, Antonietta Mira, Jukka-Pekka Onnela

Although the underlying processes of transmission are different, the network approach can be used to study the spread of pathogens in a contact network or the spread of rumors in an online social network.

Bayesian Inference

Likelihood-free inference by ratio estimation

1 code implementation30 Nov 2016 Owen Thomas, Ritabrata Dutta, Jukka Corander, Samuel Kaski, Michael U. Gutmann

The popular synthetic likelihood approach infers the parameters by modelling summary statistics of the data by a Gaussian probability distribution.

Bayesian inference in hierarchical models by combining independent posteriors

no code implementations30 Mar 2016 Ritabrata Dutta, Paul Blomstedt, Samuel Kaski

Hierarchical models are versatile tools for joint modeling of data sets arising from different, but related, sources.

Bayesian Inference

Modelling-based experiment retrieval: A case study with gene expression clustering

no code implementations19 May 2015 Paul Blomstedt, Ritabrata Dutta, Sohan Seth, Alvis Brazma, Samuel Kaski

For retrieval of gene expression experiments, we use a probabilistic model called product partition model, which induces a clustering of genes that show similar expression patterns across a number of samples.

Clustering Retrieval

Classification and Bayesian Optimization for Likelihood-Free Inference

no code implementations19 Feb 2015 Michael U. Gutmann, Jukka Corander, Ritabrata Dutta, Samuel Kaski

This approach faces at least two major difficulties: The first difficulty is the choice of the discrepancy measure which is used to judge whether the simulated data resemble the observed data.

Bayesian Optimization Classification +1

Likelihood-free inference via classification

no code implementations18 Jul 2014 Michael U. Gutmann, Ritabrata Dutta, Samuel Kaski, Jukka Corander

Increasingly complex generative models are being used across disciplines as they allow for realistic characterization of data, but a common difficulty with them is the prohibitively large computational cost to evaluate the likelihood function and thus to perform likelihood-based statistical inference.

Bayesian Inference Classification +1

Retrieval of Experiments with Sequential Dirichlet Process Mixtures in Model Space

no code implementations8 Oct 2013 Ritabrata Dutta, Sohan Seth, Samuel Kaski

We address the problem of retrieving relevant experiments given a query experiment, motivated by the public databases of datasets in molecular biology and other experimental sciences, and the need of scientists to relate to earlier work on the level of actual measurement data.

Retrieval

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