Search Results for author: Nuno Lourenço

Found 27 papers, 11 papers with code

Towards Physical Plausibility in Neuroevolution Systems

no code implementations31 Jan 2024 Gabriel Cortês, Nuno Lourenço, Penousal Machado

Even a slight reduction in power usage can lead to significant energy savings, benefiting users, companies, and the environment.

SPENSER: Towards a NeuroEvolutionary Approach for Convolutional Spiking Neural Networks

1 code implementation18 May 2023 Henrique Branquinho, Nuno Lourenço, Ernesto Costa

DENSER is a NE framework for the automatic design and parametrization of ANNs, based on the principles of Genetic Algorithms (GA) and Structured Grammatical Evolution (SGE).

Image Classification

Reducing the Price of Stable Cable Stayed Bridges with CMA-ES

no code implementations2 Apr 2023 Gabriel Fernandes, Nuno Lourenço, João Correia

There are two objectives when designing the bridges: minimizing the cost and maintaining the structural constraints in acceptable values to be considered safe.

Automatic Design of Telecom Networks with Genetic Algorithms

no code implementations2 Apr 2023 João Correia, Gustavo Gama, João Tiago Guerrinha, Ricardo Cadime, Pedro Antero Carvalhido, Tiago Vieira, Nuno Lourenço

An AI-based solution is proposed to automate network design, which is a task typically done manually by teams of engineers.

All You Need Is Sex for Diversity

no code implementations30 Mar 2023 José Maria Simões, Nuno Lourenço, Penousal Machado

Although some mechanisms of Sexual Selection have been applied to Genetic Programming in the past, the literature is scarce when it comes to mate choice.

Symbolic Regression

Context Matters: Adaptive Mutation for Grammars

1 code implementation25 Mar 2023 Pedro Carvalho, Jessica Mégane, Nuno Lourenço, Penousal Machado

This work proposes Adaptive Facilitated Mutation, a self-adaptive mutation method for Structured Grammatical Evolution (SGE), biologically inspired by the theory of facilitated variation.

Symbolic Regression

Structured mutation inspired by evolutionary theory enriches population performance and diversity

no code implementations1 Feb 2023 Stefano Tiso, Pedro Carvalho, Nuno Lourenço, Penousal Machado

Grammar-Guided Genetic Programming (GGGP) employs a variety of insights from evolutionary theory to autonomously design solutions for a given task.

Image Classification

Adversarial Robustness Assessment of NeuroEvolution Approaches

no code implementations12 Jul 2022 Inês Valentim, Nuno Lourenço, Nuno Antunes

Similarly to manually-designed networks, our results show that when the evolved models are attacked with iterative methods, their accuracy usually drops to, or close to, zero under both distance metrics.

Adversarial Robustness Image Classification

Exploring Generative Adversarial Networks for Text-to-Image Generation with Evolution Strategies

1 code implementation6 Jul 2022 Victor Costa, Nuno Lourenço, João Correia, Penousal Machado

In this work, we follow a different direction by proposing the use of Covariance Matrix Adaptation Evolution Strategy to explore the latent space of Generative Adversarial Networks.

Text-to-Image Generation

Probabilistic Structured Grammatical Evolution

1 code implementation21 May 2022 Jessica Mégane, Nuno Lourenço, Penousal Machado

PSGE statistically outperformed Grammatical Evolution (GE) on all six benchmark problems studied.

Co-evolutionary Probabilistic Structured Grammatical Evolution

1 code implementation19 Apr 2022 Jessica Mégane, Nuno Lourenço, Penousal Machado

This work proposes an extension to Structured Grammatical Evolution (SGE) called Co-evolutionary Probabilistic Structured Grammatical Evolution (Co-PSGE).

On the Exploitation of Neuroevolutionary Information: Analyzing the Past for a More Efficient Future

no code implementations26 May 2021 Unai Garciarena, Nuno Lourenço, Penousal Machado, Roberto Santana, Alexander Mendiburu

Neuroevolutionary algorithms, automatic searches of neural network structures by means of evolutionary techniques, are computationally costly procedures.

Evolving Learning Rate Optimizers for Deep Neural Networks

no code implementations23 Mar 2021 Pedro Carvalho, Nuno Lourenço, Penousal Machado

Learning Rate optimizers are a set of such techniques that search for good values of learning rates.

speech-recognition Speech Recognition

Probabilistic Grammatical Evolution

1 code implementation15 Mar 2021 Jessica Mégane, Nuno Lourenço, Penousal Machado

We evaluate the performance of PGE in two regression problems and compare it with GE and Structured Grammatical Evolution (SGE).

Demonstrating the Evolution of GANs through t-SNE

no code implementations31 Jan 2021 Victor Costa, Nuno Lourenço, João Correia, Penousal Machado

Evolutionary algorithms, such as COEGAN, were recently proposed as a solution to improve the GAN training, overcoming common problems that affect the model, such as vanishing gradient and mode collapse.

Evolutionary Algorithms

Exploring the Evolution of GANs through Quality Diversity

1 code implementation13 Jul 2020 Victor Costa, Nuno Lourenço, João Correia, Penousal Machado

We compare our proposal with the original COEGAN model and with an alternative version using a global competition approach.

Evolutionary Algorithms

AutoLR: An Evolutionary Approach to Learning Rate Policies

no code implementations8 Jul 2020 Pedro Carvalho, Nuno Lourenço, Filipe Assunção, Penousal Machado

This work presents AutoLR, a framework that evolves Learning Rate Schedulers for a specific Neural Network Architecture using Structured Grammatical Evolution.

Using Skill Rating as Fitness on the Evolution of GANs

no code implementations9 Apr 2020 Victor Costa, Nuno Lourenço, João Correia, Penousal Machado

Recent works proposed the use of evolutionary algorithms on GAN training, aiming to solve these challenges and to provide an automatic way to find good models.

Evolutionary Algorithms

Evolution of Scikit-Learn Pipelines with Dynamic Structured Grammatical Evolution

1 code implementation1 Apr 2020 Filipe Assunção, Nuno Lourenço, Bernardete Ribeiro, Penousal Machado

The deployment of Machine Learning (ML) models is a difficult and time-consuming job that comprises a series of sequential and correlated tasks that go from the data pre-processing, and the design and extraction of features, to the choice of the ML algorithm and its parameterisation.

AutoML BIG-bench Machine Learning +1

Incremental Evolution and Development of Deep Artificial Neural Networks

1 code implementation1 Apr 2020 Filipe Assunção, Nuno Lourenço, Bernardete Ribeiro, Penousal Machado

Despite aiding non-expert users to design and train ANNs, the vast majority of NE approaches disregard the knowledge that is gathered when solving other tasks, i. e., evolution starts from scratch for each problem, ultimately delaying the evolutionary process.

COEGAN: Evaluating the Coevolution Effect in Generative Adversarial Networks

1 code implementation12 Dec 2019 Victor Costa, Nuno Lourenço, João Correia, Penousal Machado

COEGAN is a model that uses neuroevolution and coevolution in the GAN training algorithm to provide a more stable training method and the automatic design of neural network architectures.

Coevolution of Generative Adversarial Networks

no code implementations12 Dec 2019 Victor Costa, Nuno Lourenço, Penousal Machado

Therefore, this project proposes COEGAN, a model that combines neuroevolution and coevolution in the coordination of the GAN training algorithm.

The Impact of Data Preparation on the Fairness of Software Systems

no code implementations5 Oct 2019 Inês Valentim, Nuno Lourenço, Nuno Antunes

Data preparation is key in any machine learning pipeline, but its effect on fairness is yet to be studied in detail.

Attribute BIG-bench Machine Learning +1

Automatic Design of Artificial Neural Networks for Gamma-Ray Detection

no code implementations9 May 2019 Filipe Assunção, João Correia, Rúben Conceição, Mário Pimenta, Bernardo Tomé, Nuno Lourenço, Penousal Machado

The results show that the best CNN generated by Fast-DENSER++ improves by a factor of 2 when compared with the results reported by classic statistical approaches.

Fast-DENSER++: Evolving Fully-Trained Deep Artificial Neural Networks

no code implementations8 May 2019 Filipe Assunção, Nuno Lourenço, Penousal Machado, Bernardete Ribeiro

This paper proposes a new extension to Deep Evolutionary Network Structured Evolution (DENSER), called Fast-DENSER++ (F-DENSER++).

DENSER: Deep Evolutionary Network Structured Representation

17 code implementations4 Jan 2018 Filipe Assunção, Nuno Lourenço, Penousal Machado, Bernardete Ribeiro

Deep Evolutionary Network Structured Representation (DENSER) is a novel approach to automatically design Artificial Neural Networks (ANNs) using Evolutionary Computation.

Data Augmentation

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