Search Results for author: Petre Stoica

Found 22 papers, 9 papers with code

Fair principal component analysis (PCA): minorization-maximization algorithms for Fair PCA, Fair Robust PCA and Fair Sparse PCA

no code implementations10 May 2023 Prabhu Babu, Petre Stoica

We also propose two important reformulations of the fair PCA problem: a) fair robust PCA -- which can handle outliers in the data, and b) fair sparse PCA -- which can enforce sparsity on the estimated fair principal components.

Pearson-Matthews correlation coefficients for binary and multinary classification and hypothesis testing

no code implementations10 May 2023 Petre Stoica, Prabhu Babu

We also present an additional new metric for multinary classification which can be viewed as a direct extension of MCC.

Binary Classification Classification

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

The Cramer-Rao Bound for Signal Parameter Estimation from Quantized Data

no code implementations27 Sep 2022 Petre Stoica, Xiaolei Shang, Yuanbo Cheng

Moreover, the CRB is an achievable limit, for instance it is asymptotically attained by the maximum likelihood estimator (under regularity conditions), and thus it is a useful benchmark to which the accuracy of any parameter estimator can and should be compared.

Quantization

Learning Sparse Graphs via Majorization-Minimization for Smooth Node Signals

no code implementations6 Feb 2022 Ghania Fatima, Aakash Arora, Prabhu Babu, Petre Stoica

The proposed algorithm does not require tuning of any hyperparameter and it has the desirable feature of eliminating the inactive variables in the course of the iterations - which can help speeding up the algorithm.

Graph Learning

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.

Weighted SPICE Algorithms for Range-Doppler Imaging Using One-Bit Automotive Radar

no code implementations31 Mar 2021 Xiaolei Shang, Jian Li, Petre Stoica

The recently proposed hyperparameter-free (and hence user friendly) weighted SPICE algorithms, including SPICE, LIKES, SLIM and IAA, achieve excellent parameter estimation performance for data sampled with high precision.

Sinusoidal Parameter Estimation from Signed Measurements via Majorization-Minimization Based RELAX

no code implementations21 Mar 2021 Jiaying Ren, Tianyi Zhang, Jian Li, Petre Stoica

In a previous paper, a relaxation-based algorithm, referred to as 1bRELAX, has been proposed to iteratively maximize the likelihood function.

Computational Efficiency

Joint RFI Mitigation and Radar Echo Recovery for One-Bit UWB Radar

no code implementations19 Mar 2021 Tianyi Zhang, Jiaying Ren, Jian Li, Lam H. Nguyen, Petre Stoica

Radio frequency interference (RFI) mitigation and radar echo recovery are critically important for the proper functioning of ultra-wideband (UWB) radar systems using one-bit sampling techniques.

RFI Mitigation for One-bit UWB Radar Systems

no code implementations17 Feb 2021 Tianyi Zhang, Jiaying Ren, Jian Li, Lam H. Nguyen, Petre Stoica

A one-bit UWB system obtains its signed measurements via a low-cost and high rate sampling scheme, referred to as the Continuous Time Binary Value (CTBV) technology.

Computational Efficiency Quantization

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

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.

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

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

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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