Search Results for author: Luca Martino

Found 20 papers, 2 papers with code

CAMEO: Curiosity Augmented Metropolis for Exploratory Optimal Policies

no code implementations19 May 2022 Simo Alami. C, Fernando Llorente, Rim Kaddah, Luca Martino, Jesse Read

We further show that the different policies we sample present different risk profiles, corresponding to interesting practical applications in interpretability, and represents a first step towards learning the distribution of optimal policies itself.

Inference over radiative transfer models using variational and expectation maximization methods

1 code implementation7 Apr 2022 Daniel Heestermans Svendsen, Daniel Hernández-Lobato, Luca Martino, Valero Laparra, Alvaro Moreno, Gustau Camps-Valls

Radiative transfer models (RTMs) encode the energy transfer through the atmosphere, and are used to model and understand the Earth system, as well as to estimate the parameters that describe the status of the Earth from satellite observations by inverse modeling.

Earth Observation

Optimality in Noisy Importance Sampling

no code implementations7 Jan 2022 Fernando Llorente, Luca Martino, Jesse Read, David Delgado-Gómez

In this work, we analyze the noisy importance sampling (IS), i. e., IS working with noisy evaluations of the target density.

Compressed Monte Carlo with application in particle filtering

no code implementations18 Jul 2021 Luca Martino, Víctor Elvira

In its basic version, C-MC is strictly related to the stratification technique, a well-known method used for variance reduction purposes.

Bayesian Inference

Integrating Domain Knowledge in Data-driven Earth Observation with Process Convolutions

no code implementations16 Apr 2021 Daniel Heestermans Svendsen, Maria Piles, Jordi Muñoz-Marí, David Luengo, Luca Martino, Gustau Camps-Valls

We specifically propose the use of a class of GP convolution models called latent force models (LFMs) for EO time series modelling, analysis and understanding.

Earth Observation Time Series +1

Gradient-based Automatic Look-Up Table Generator for Atmospheric Radiative Transfer Models

no code implementations7 Dec 2020 Jorge Vicent, Luis Alonso, Luca Martino, Neus Sabater, Jochem Verrelst, Gustau Camps-Valls

Our results indicate that, when compared to a pseudo-random homogeneous distribution of the LUT nodes, GALGA reduces (1) the LUT size by $\sim$75\% and (2) the maximum interpolation relative errors by 0. 5\% It is concluded that automatic LUT design might benefit from the methodology proposed in GALGA to reduce computation time and interpolation errors.

Earth Observation

A Joint introduction to Gaussian Processes and Relevance Vector Machines with Connections to Kalman filtering and other Kernel Smoothers

no code implementations19 Sep 2020 Luca Martino, Jesse Read

Our focus is on developing a common framework with which to view these methods, via intermediate methods a probabilistic version of the well-known kernel ridge regression, and drawing connections among them, via dual formulations, and discussion of their application in the context of major tasks: regression, smoothing, interpolation, and filtering.

Gaussian Processes regression

Active emulation of computer codes with Gaussian processes -- Application to remote sensing

no code implementations13 Dec 2019 Daniel Heestermans Svendsen, Luca Martino, Gustau Camps-Valls

Many fields of science and engineering rely on running simulations with complex and computationally expensive models to understand the involved processes in the system of interest.

Active Learning Gaussian Processes

Probabilistic Regressor Chains with Monte Carlo Methods

no code implementations18 Jul 2019 Jesse Read, Luca Martino

A large number and diversity of techniques have been offered in the literature in recent years for solving multi-label classification tasks, including classifier chains where predictions are cascaded to other models as additional features.

Multi-Label Classification

A Review of Multiple Try MCMC algorithms for Signal Processing

no code implementations27 Jan 2018 Luca Martino

Many applications in signal processing require the estimation of some parameters of interest given a set of observed data.

Bayesian Inference

Joint Gaussian Processes for Biophysical Parameter Retrieval

no code implementations14 Nov 2017 Daniel Heestermans Svendsen, Luca Martino, Manuel Campos-Taberner, Francisco Javier García-Haro, Gustau Camps-Valls

Radiative transfer models (RTMs) represent mathematically the physical laws which govern the phenomena in remote sensing applications (forward models).

Gaussian Processes regression +1

Metropolis Sampling

no code implementations15 Apr 2017 Luca Martino, Victor Elvira

Monte Carlo (MC) sampling methods are widely applied in Bayesian inference, system simulation and optimization problems.

Bayesian Inference

The Recycling Gibbs Sampler for Efficient Learning

no code implementations21 Nov 2016 Luca Martino, Victor Elvira, Gustau Camps-Valls

The key point for the successful application of the Gibbs sampler is the ability to draw efficiently samples from the full-conditional probability density functions.

Bayesian Inference Computational Efficiency +1

Multi-label Methods for Prediction with Sequential Data

1 code implementation27 Sep 2016 Jesse Read, Luca Martino, Jaakko Hollmén

In this paper we detect and elaborate on connections between multi-label methods and Markovian models, and study the suitability of multi-label methods for prediction in sequential data.

General Classification

Efficient Monte Carlo Methods for Multi-Dimensional Learning with Classifier Chains

no code implementations9 Nov 2012 Jesse Read, Luca Martino, David Luengo

Multi-dimensional classification (MDC) is the supervised learning problem where an instance is associated with multiple classes, rather than with a single class, as in traditional classification problems.

Classification General Classification +1

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