Search Results for author: Dave Zachariah

Found 30 papers, 18 papers with code

Adaptive Parameter-Free Robust Learning using Latent Bernoulli Variables

1 code implementation1 Dec 2023 Aleksandr Karakulev, Dave Zachariah, Prashant Singh

We present an efficient parameter-free approach for statistical learning from corrupted training sets.

Variational Inference

Externally Valid Policy Evaluation Combining Trial and Observational Data

no code implementations23 Oct 2023 Sofia Ek, Dave Zachariah

Trial data is, however, drawn from a population which may differ from the intended target population and this raises a problem of external validity (aka.

valid

Off-Policy Evaluation with Out-of-Sample Guarantees

1 code implementation20 Jan 2023 Sofia Ek, Dave Zachariah, Fredrik D. Johansson, Petre Stoica

We consider the problem of evaluating the performance of a decision policy using past observational data.

Off-policy evaluation valid

Calibration tests beyond classification

1 code implementation ICLR 2021 David Widmann, Fredrik Lindsten, Dave Zachariah

In the machine learning literature, different measures and statistical tests have been proposed and studied for evaluating the calibration of classification models.

Classification Decision Making +3

Surprises in adversarially-trained linear regression

no code implementations25 May 2022 Antônio H. Ribeiro, Dave Zachariah, Thomas B. Schön

We prove that adversarial training with small disturbances gives the solution with the minimum-norm that interpolates the training data.

regression

Tuned Regularized Estimators for Linear Regression via Covariance Fitting

no code implementations21 Jan 2022 Per Mattsson, Dave Zachariah, Petre Stoica

We start by showing that three known optimal linear estimators belong to a wider class of estimators that can be formulated as a solution to a weighted and constrained minimization problem.

regression

Learning Pareto-Efficient Decisions with Confidence

no code implementations19 Oct 2021 Sofia Ek, Dave Zachariah, Petre Stoica

The paper considers the problem of multi-objective decision support when outcomes are uncertain.

Conformal Prediction

Robust Learning in Heterogeneous Contexts

no code implementations18 May 2021 Muhammad Osama, Dave Zachariah, Petre Stoica

We consider the problem of learning from training data obtained in different contexts, where the underlying context distribution is unknown and is estimated empirically.

Inference of Causal Effects when Control Variables are Unknown

1 code implementation15 Dec 2020 Ludvig Hult, Dave Zachariah

We verify the capability of the method to produce valid confidence intervals for average causal effects using synthetic data, even when the appropriate specification of control variables is unknown.

valid

Robust Localization in Wireless Networks From Corrupted Signals

1 code implementation9 Oct 2020 Muhammad Osama, Dave Zachariah, Satyam Dwivedi, Petre Stoica

We address the problem of timing-based localization in wireless networks, when an unknown fraction of data is corrupted by nonideal signal conditions.

Prediction of Spatial Point Processes: Regularized Method with Out-of-Sample Guarantees

1 code implementation NeurIPS 2019 Muhammad Osama, Dave Zachariah, Petre Stoica

A spatial point process can be characterized by an intensity function which predicts the number of events that occur across space.

Point Processes valid

Learning Robust Decision Policies from Observational Data

no code implementations NeurIPS 2020 Muhammad Osama, Dave Zachariah, Peter Stoica

We address the problem of learning a decision policy from observational data of past decisions in contexts with features and associated outcomes.

Conformal Prediction valid

A latent variable approach to heat load prediction in thermal grids

no code implementations13 Feb 2020 Johan Simonsson, Khalid Tourkey Atta, Dave Zachariah, Wolfgang Birk

In this paper a new method for heat load prediction in district energy systems is proposed.

Robust Prediction when Features are Missing

no code implementations16 Dec 2019 Xiuming Liu, Dave Zachariah, Petre Stoica

The robustness properties of the approach are demonstrated on both real and synthetic data.

Calibration tests in multi-class classification: A unifying framework

1 code implementation NeurIPS 2019 David Widmann, Fredrik Lindsten, Dave Zachariah

In safety-critical applications a probabilistic model is usually required to be calibrated, i. e., to capture the uncertainty of its predictions accurately.

Classification General Classification +1

Robust Risk Minimization for Statistical Learning

1 code implementation3 Oct 2019 Muhammad Osama, Dave Zachariah, Peter Stoica

We consider a general statistical learning problem where an unknown fraction of the training data is corrupted.

regression

Effect Inference from Two-Group Data with Sampling Bias

1 code implementation26 Feb 2019 Dave Zachariah, Petre Stoica

In many applications, different populations are compared using data that are sampled in a biased manner.

Vocal Bursts Valence Prediction

Inferring Heterogeneous Causal Effects in Presence of Spatial Confounding

1 code implementation28 Jan 2019 Muhammad Osama, Dave Zachariah, Thomas B. Schön

We address the problem of inferring the causal effect of an exposure on an outcome across space, using observational data.

Reliable Semi-Supervised Learning when Labels are Missing at Random

no code implementations27 Nov 2018 Xiuming Liu, Dave Zachariah, Johan Wågberg, Thomas B. Schön

Semi-supervised learning methods are motivated by the availability of large datasets with unlabeled features in addition to labeled data.

General Classification

Data Consistency Approach to Model Validation

1 code implementation17 Aug 2018 Andreas Svensson, Dave Zachariah, Petre Stoica, Thomas B. Schön

The contribution in this paper is a general criterion to evaluate the consistency of a set of statistical models with respect to observed data.

Time Series Time Series Analysis

Learning Localized Spatio-Temporal Models From Streaming Data

1 code implementation ICML 2018 Muhammad Osama, Dave Zachariah, Thomas B. Schön

We address the problem of predicting spatio-temporal processes with temporal patterns that vary across spatial regions, when data is obtained as a stream.

Composite Gaussian Processes: Scalable Computation and Performance Analysis

no code implementations31 Jan 2018 Xiuming Liu, Dave Zachariah, Edith C. H. Ngai

Gaussian process (GP) models provide a powerful tool for prediction but are computationally prohibitive using large data sets.

Gaussian Processes

Learning Sparse Graphs for Prediction and Filtering of Multivariate Data Processes

no code implementations12 Dec 2017 Arun Venkitaraman, Dave Zachariah

We address the problem of prediction of multivariate data process using an underlying graph model.

How consistent is my model with the data? Information-Theoretic Model Check

1 code implementation7 Dec 2017 Andreas Svensson, Dave Zachariah, Thomas B. Schön

The choice of model class is fundamental in statistical learning and system identification, no matter whether the class is derived from physical principles or is a generic black-box.

Model-Robust Counterfactual Prediction Method

1 code implementation19 May 2017 Dave Zachariah, Petre Stoica

We develop a novel method for counterfactual analysis based on observational data using prediction intervals for units under different exposures.

Conformal Prediction counterfactual +1

Online Learning for Distribution-Free Prediction

1 code implementation15 Mar 2017 Dave Zachariah, Petre Stoica, Thomas B. Schön

We develop an online learning method for prediction, which is important in problems with large and/or streaming data sets.

Recursive nonlinear-system identification using latent variables

1 code implementation14 Jun 2016 Per Mattsson, Dave Zachariah, Petre Stoica

In this paper we develop a method for learning nonlinear systems with multiple outputs and inputs.

Prediction performance after learning in Gaussian process regression

no code implementations13 Jun 2016 Johan Wågberg, Dave Zachariah, Thomas B. Schön, Petre Stoica

Starting from a generalization of the Cram\'er-Rao bound, we derive a more accurate MSE bound which provides a measure of uncertainty for prediction of Gaussian processes.

Gaussian Processes regression

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