Search Results for author: Bart Dhoedt

Found 38 papers, 8 papers with code

Representation learning for very short texts using weighted word embedding aggregation

1 code implementation2 Jul 2016 Cedric De Boom, Steven Van Canneyt, Thomas Demeester, Bart Dhoedt

Traditional textual representations, such as tf-idf, have difficulty grasping the semantic meaning of such texts, which is important in applications such as event detection, opinion mining, news recommendation, etc.

Event Detection News Recommendation +5

Curiosity-Driven Exploration via Latent Bayesian Surprise

2 code implementations ICLR Workshop SSL-RL 2021 Pietro Mazzaglia, Ozan Catal, Tim Verbelen, Bart Dhoedt

The human intrinsic desire to pursue knowledge, also known as curiosity, is considered essential in the process of skill acquisition.

Mastering the Unsupervised Reinforcement Learning Benchmark from Pixels

1 code implementation24 Sep 2022 Sai Rajeswar, Pietro Mazzaglia, Tim Verbelen, Alexandre Piché, Bart Dhoedt, Aaron Courville, Alexandre Lacoste

In this work, we study the URLB and propose a new method to solve it, using unsupervised model-based RL, for pre-training the agent, and a task-aware fine-tuning strategy combined with a new proposed hybrid planner, Dyna-MPC, to adapt the agent for downstream tasks.

reinforcement-learning Reinforcement Learning (RL) +1

Choreographer: Learning and Adapting Skills in Imagination

1 code implementation23 Nov 2022 Pietro Mazzaglia, Tim Verbelen, Bart Dhoedt, Alexandre Lacoste, Sai Rajeswar

Unsupervised skill learning aims to learn a rich repertoire of behaviors without external supervision, providing artificial agents with the ability to control and influence the environment.

Unsupervised Reinforcement Learning

Character-level Recurrent Neural Networks in Practice: Comparing Training and Sampling Schemes

2 code implementations2 Jan 2018 Cedric De Boom, Thomas Demeester, Bart Dhoedt

Recurrent neural networks are nowadays successfully used in an abundance of applications, going from text, speech and image processing to recommender systems.

Recommendation Systems

Efficiency Evaluation of Character-level RNN Training Schedules

1 code implementation9 May 2016 Cedric De Boom, Sam Leroux, Steven Bohez, Pieter Simoens, Thomas Demeester, Bart Dhoedt

We present four training and prediction schedules from the same character-level recurrent neural network.

Contrastive Active Inference

1 code implementation NeurIPS 2021 Pietro Mazzaglia, Tim Verbelen, Bart Dhoedt

In this work, we propose a contrastive objective for active inference that strongly reduces the computational burden in learning the agent's generative model and planning future actions.

reinforcement-learning Reinforcement Learning (RL)

Learning to Grasp from a Single Demonstration

no code implementations9 Jun 2018 Pieter Van Molle, Tim Verbelen, Elias De Coninck, Cedric De Boom, Pieter Simoens, Bart Dhoedt

Learning-based approaches for robotic grasping using visual sensors typically require collecting a large size dataset, either manually labeled or by many trial and errors of a robotic manipulator in the real or simulated world.

Robotic Grasping

Privacy Aware Offloading of Deep Neural Networks

no code implementations30 May 2018 Sam Leroux, Tim Verbelen, Pieter Simoens, Bart Dhoedt

Deep neural networks require large amounts of resources which makes them hard to use on resource constrained devices such as Internet-of-things devices.

Transfer Learning with Binary Neural Networks

no code implementations29 Nov 2017 Sam Leroux, Steven Bohez, Tim Verbelen, Bert Vankeirsbilck, Pieter Simoens, Bart Dhoedt

Binary neural networks are attractive in this case because the logical operations are very fast and efficient when implemented in hardware.

Transfer Learning

Decoupled Learning of Environment Characteristics for Safe Exploration

no code implementations9 Aug 2017 Pieter Van Molle, Tim Verbelen, Steven Bohez, Sam Leroux, Pieter Simoens, Bart Dhoedt

However, when learning a task using reinforcement learning, the agent cannot distinguish the characteristics of the environment from those of the task.

reinforcement-learning Reinforcement Learning (RL) +1

Sensor Fusion for Robot Control through Deep Reinforcement Learning

no code implementations13 Mar 2017 Steven Bohez, Tim Verbelen, Elias De Coninck, Bert Vankeirsbilck, Pieter Simoens, Bart Dhoedt

Deep reinforcement learning is becoming increasingly popular for robot control algorithms, with the aim for a robot to self-learn useful feature representations from unstructured sensory input leading to the optimal actuation policy.

reinforcement-learning Reinforcement Learning (RL) +1

Lazy Evaluation of Convolutional Filters

no code implementations27 May 2016 Sam Leroux, Steven Bohez, Cedric De Boom, Elias De Coninck, Tim Verbelen, Bert Vankeirsbilck, Pieter Simoens, Bart Dhoedt

In this paper we propose a technique which avoids the evaluation of certain convolutional filters in a deep neural network.

Learning Semantic Similarity for Very Short Texts

no code implementations2 Dec 2015 Cedric De Boom, Steven Van Canneyt, Steven Bohez, Thomas Demeester, Bart Dhoedt

We therefore investigated several text representations as a combination of word embeddings in the context of semantic pair matching.

Information Retrieval Retrieval +5

Improving Generalization for Abstract Reasoning Tasks Using Disentangled Feature Representations

no code implementations12 Nov 2018 Xander Steenbrugge, Sam Leroux, Tim Verbelen, Bart Dhoedt

In this work we explore the generalization characteristics of unsupervised representation learning by leveraging disentangled VAE's to learn a useful latent space on a set of relational reasoning problems derived from Raven Progressive Matrices.

Relational Reasoning Representation Learning

Bayesian policy selection using active inference

no code implementations17 Apr 2019 Ozan Çatal, Johannes Nauta, Tim Verbelen, Pieter Simoens, Bart Dhoedt

Learning to take actions based on observations is a core requirement for artificial agents to be able to be successful and robust at their task.

Reinforcement Learning (RL)

Learning to Catch Piglets in Flight

no code implementations28 Jan 2020 Ozan Çatal, Lawrence De Mol, Tim Verbelen, Bart Dhoedt

To develop and test our method, we start with an easy to identify object: a stuffed Piglet.

Object object-detection +1

Learning Perception and Planning with Deep Active Inference

no code implementations30 Jan 2020 Ozan Çatal, Tim Verbelen, Johannes Nauta, Cedric De Boom, Bart Dhoedt

Active inference is a process theory of the brain that states that all living organisms infer actions in order to minimize their (expected) free energy.

Rhythm, Chord and Melody Generation for Lead Sheets using Recurrent Neural Networks

no code implementations21 Feb 2020 Cedric De Boom, Stephanie Van Laere, Tim Verbelen, Bart Dhoedt

Music that is generated by recurrent neural networks often lacks a sense of direction and coherence.

Deep Active Inference for Autonomous Robot Navigation

no code implementations6 Mar 2020 Ozan Çatal, Samuel Wauthier, Tim Verbelen, Cedric De Boom, Bart Dhoedt

Active inference is a theory that underpins the way biological agent's perceive and act in the real world.

Bayesian Inference Robot Navigation

Dynamic Narrowing of VAE Bottlenecks Using GECO and L0 Regularization

no code implementations24 Mar 2020 Cedric De Boom, Samuel Wauthier, Tim Verbelen, Bart Dhoedt

In case the dimensionality is not predefined, this parameter is usually determined using time- and resource-consuming cross-validation.

LatentSLAM: unsupervised multi-sensor representation learning for localization and mapping

no code implementations7 May 2021 Ozan Çatal, Wouter Jansen, Tim Verbelen, Bart Dhoedt, Jan Steckel

Biologically inspired algorithms for simultaneous localization and mapping (SLAM) such as RatSLAM have been shown to yield effective and robust robot navigation in both indoor and outdoor environments.

Representation Learning Robot Navigation +2

Disentangling What and Where for 3D Object-Centric Representations Through Active Inference

no code implementations26 Aug 2021 Toon Van de Maele, Tim Verbelen, Ozan Catal, Bart Dhoedt

In this paper, we propose an active inference agent that actively gathers evidence for object classifications, and can learn novel object categories over time.

Object object-detection +1

The Free Energy Principle for Perception and Action: A Deep Learning Perspective

no code implementations13 Jul 2022 Pietro Mazzaglia, Tim Verbelen, Ozan Çatal, Bart Dhoedt

The free energy principle, and its corollary active inference, constitute a bio-inspired theory that assumes biological agents act to remain in a restricted set of preferred states of the world, i. e., they minimize their free energy.

Variational Inference

Audio-guided Album Cover Art Generation with Genetic Algorithms

no code implementations14 Jul 2022 James Marien, Sam Leroux, Bart Dhoedt, Cedric De Boom

We find that our framework can generate suitable cover art for most genres, and that the visual features adapt themselves to audio feature changes.

Learning Generative Models for Active Inference using Tensor Networks

no code implementations18 Aug 2022 Samuel T. Wauthier, Bram Vanhecke, Tim Verbelen, Bart Dhoedt

The ability of tensor networks to represent the probabilistic nature of quantum states as well as to reduce large state spaces makes tensor networks a natural candidate for active inference.

Tensor Networks

Home Run: Finding Your Way Home by Imagining Trajectories

no code implementations19 Aug 2022 Daria de Tinguy, Pietro Mazzaglia, Tim Verbelen, Bart Dhoedt

When studying unconstrained behaviour and allowing mice to leave their cage to navigate a complex labyrinth, the mice exhibit foraging behaviour in the labyrinth searching for rewards, returning to their home cage now and then, e. g. to drink.

Navigate

Disentangling Shape and Pose for Object-Centric Deep Active Inference Models

no code implementations16 Sep 2022 Stefano Ferraro, Toon Van de Maele, Pietro Mazzaglia, Tim Verbelen, Bart Dhoedt

Recently, deep learning methods have been proposed to learn a hidden state space structure purely from data, alleviating the experimenter from this tedious design task, but resulting in an entangled, non-interpreteable state space.

Disentanglement

Object-Centric Scene Representations using Active Inference

no code implementations7 Feb 2023 Toon Van de Maele, Tim Verbelen, Pietro Mazzaglia, Stefano Ferraro, Bart Dhoedt

Representing a scene and its constituent objects from raw sensory data is a core ability for enabling robots to interact with their environment.

Object Scene Understanding

Inferring Hierarchical Structure in Multi-Room Maze Environments

no code implementations23 Jun 2023 Daria de Tinguy, Toon Van de Maele, Tim Verbelen, Bart Dhoedt

Cognitive maps play a crucial role in facilitating flexible behaviour by representing spatial and conceptual relationships within an environment.

Efficient Exploration

FOCUS: Object-Centric World Models for Robotics Manipulation

no code implementations5 Jul 2023 Stefano Ferraro, Pietro Mazzaglia, Tim Verbelen, Bart Dhoedt

Understanding the world in terms of objects and the possible interplays with them is an important cognition ability, especially in robotics manipulation, where many tasks require robot-object interactions.

Object

Integrating cognitive map learning and active inference for planning in ambiguous environments

no code implementations16 Aug 2023 Toon Van de Maele, Bart Dhoedt, Tim Verbelen, Giovanni Pezzulo

Living organisms need to acquire both cognitive maps for learning the structure of the world and planning mechanisms able to deal with the challenges of navigating ambiguous environments.

Bridging Cognitive Maps: a Hierarchical Active Inference Model of Spatial Alternation Tasks and the Hippocampal-Prefrontal Circuit

no code implementations22 Aug 2023 Toon Van de Maele, Bart Dhoedt, Tim Verbelen, Giovanni Pezzulo

Through a series of simulations, we demonstrate that the model's dual layers acquire effective cognitive maps for navigation within physical (HC map) and task (mPFC map) spaces, using a biologically-inspired approach: a clone-structured cognitive graph.

Learning Spatial and Temporal Hierarchies: Hierarchical Active Inference for navigation in Multi-Room Maze Environments

no code implementations18 Sep 2023 Daria de Tinguy, Toon Van de Maele, Tim Verbelen, Bart Dhoedt

Cognitive maps play a crucial role in facilitating flexible behaviour by representing spatial and conceptual relationships within an environment.

Efficient Exploration

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