About Damien Ernst

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So far Damien Ernst has created 71 blog entries.

IMP-MARL: Infrastructure Management Planning via MARL

Pascal Leroy, Pablo G. Morato, Jonathan Pisane, Athanasios Kolios, Damien Ernst. 37th Conference on Neural Information Processing Systems (NeurIPS 2023) Track on Datasets and Benchmarks. https://hdl.handle.net/2268/304451 Infrastructure Management Planning (IMP) is a modern application addressing current societal and environmental concerns. In IMP, agents plan inspections, repairs or retrofits to prevent failures in structures like bridges or wind turbines. The goal is to minimise the risk of system failures by considering the probability of failure and the associated consequences.

29 novembre 2023|

Warming up recurrent neural networks to maximise reachable multistability greatly improves learning

Recurrent neural networks (RNNs) are a special type of artificial neural networks that can be used to process sequences, such as time series or sentences, through an internal state that serves as a memory. However, training RNNs is known to be difficult, especially for long sequences. Indeed, when gradients are backpropagated through a high number of timesteps, they are more prone to either vanish or explode, making it difficult to learn long-term dependencies. Previous work (Vecoven et al., 2021) introduced RNNs with multistable dynamics and showed that it can improve the learning of such dependencies. In this new paper (Lambrechts et al., 2023), we expand this idea by first deriving a measure of multistability, called the VAA. This metric is then used to unveil the correlation between the reachable multistability of an RNN and its learning of long-term dependencies, both in a supervised and a reinforcement learning setting. Secondly, we establish a derivable approximation of our new measure. Gradient ascent steps can then be performed on a usual RNN using batches of sequences, in order to maximise that approximation. This aims at promoting multistability within the RNN's internal dynamics, and it works for any RNN, including the classical GRU and LSTM networks. Finally, we test this new pretraining method, called the warmup, on both supervised and reinforcement learning benchmarks. RNNs pretrained with the warmup are shown to learn faster and better the long-term dependencies than their non-pretrained counterparts.

24 août 2023|

Energy Conversation: The Role of ‘Necessary Conditions’ in Merging Contrasting Energy Perspectives

Synopsis: In a spirited discussion about energy strategies, Anna champions the cause of cost-effectiveness, while Lucas emphasizes the importance of energy return on investment. As tensions rise, Eva introduces a groundbreaking approach that could bridge their differences.

16 août 2023|

La politisation de la Boucle du Hainaut compromet l’avenir de la province, du pays et du climat

Qui ne rêverait pas d’un Hainaut prospère où le taux d’emploi serait à des niveaux jamais atteints ? Qui ne rêverait pas que la Belgique puisse bénéficier de l’énergie produite par ses éoliennes en mer du Nord afin de décarboner son économie ? Une énergie décarbonée qui servirait l’entreprise, l’économie et le citoyen belge. Ce rêve était à portée de nos mains. Mais la politisation d’un dossier crucial pour notre région nous en éloigne chaque jour un peu plus.

24 mai 2023|

Job offers – Research positions in Machine Learning/Optimisation for Energy Systems

The research positions are about combining modelling, simulation, optimisation, and machine learning techniques in order to investigate several technical, economic and regulatory aspects induced by major upcoming changes in energy (and in particular, electricity) generation, transmission, distribution and consumption in the context of the Energy transition. In particular, we are looking to fill several positions [...]

9 mars 2023|

Recurrent neural networks, hidden states and beliefs in partially observable environments

Despite achieving impressive performances on various tasks, modern artificial intelligence (AI) systems have become complex black box models. A growing body of work aspires to open the box and understand its internal functioning. In this new article (Lambrechts et al., 2022), we follow this field of research by studying the internal representation that intelligent agents learn through reinforcement learning (RL), when those agents act in partially observable environments (POEs). In particular, the informational content of the memory of those agents is studied when the latter are trained to act optimally in maze and orientation tasks.

1 septembre 2022|

The Graph-Based Optimization Modeling Language (GBOML)

The decarbonisation of energy systems is one of the main challenges of our century. Finding the optimal technological mix to achieve that goal is a major concern for policy and decision makers alike. These problems are known as energy system planning and sizing and are often tackled by Mixed Integer Linear Programming (MILP). In order [...]

25 avril 2022|

Gym-ANM: Reinforcement learning environments for active network management tasks in electricity distribution systems

Download the paper Summary: Active network management (ANM) of electricity distribution networks include many complex stochastic sequential optimization problems. These problems need to be solved for integrating renewable energies and distributed storage into future electrical grids. In this work, we introduce Gym-ANM, a framework for designing reinforcement learning (RL) environments that model ANM tasks in [...]

14 mars 2021|

Remote Renewable Hubs for Carbon-Neutral Fuel Production

Decarbonising sectors such as aviation, heating and industry has proved difficult via direct electrification. Hence, the synthesis of carbon-neutral fuels and feedstocks from renewable electricity has received much attention in recent years. However, in European countries such as Belgium, the theoretical amount of renewable electricity that may be produced is known to be insufficient to [...]

24 février 2021|

Sector coupling for the energy transition: the case of the Dutch energy system

The topic of sector coupling and the role it may play in the energy transition has recently received a great deal of attention in European energy policy circles. In particular, power-to-gas technologies, which enable the production of hydrogen via water electrolysis as well as the synthesis of methane via the hydrogenation of carbon dioxide (the [...]

4 juillet 2020|