Search Results for author: Georgia Chalvatzaki

Found 31 papers, 6 papers with code

ActionFlow: Equivariant, Accurate, and Efficient Policies with Spatially Symmetric Flow Matching

no code implementations6 Sep 2024 Niklas Funk, Julen Urain, Joao Carvalho, Vignesh Prasad, Georgia Chalvatzaki, Jan Peters

Despite the impressive results of deep generative models in complex manipulation tasks, the absence of a representation that encodes intricate spatial relationships between observations and actions often limits spatial generalization, necessitating large amounts of demonstrations.

Action Generation

Safe and Efficient Path Planning under Uncertainty via Deep Collision Probability Fields

no code implementations6 Sep 2024 Felix Herrmann, Sebastian Zach, Jacopo Banfi, Jan Peters, Georgia Chalvatzaki, Davide Tateo

Estimating collision probabilities between robots and environmental obstacles or other moving agents is crucial to ensure safety during path planning.

Autonomous Driving

MoVEInt: Mixture of Variational Experts for Learning Human-Robot Interactions from Demonstrations

no code implementations10 Jul 2024 Vignesh Prasad, Alap Kshirsagar, Dorothea Koert, Ruth Stock-Homburg, Jan Peters, Georgia Chalvatzaki

In this work, we propose a novel approach for learning a shared latent space representation for HRIs from demonstrations in a Mixture of Experts fashion for reactively generating robot actions from human observations.

Evetac: An Event-based Optical Tactile Sensor for Robotic Manipulation

no code implementations2 Dec 2023 Niklas Funk, Erik Helmut, Georgia Chalvatzaki, Roberto Calandra, Jan Peters

To overcome this shortcoming, we study the idea of replacing the RGB camera with an event-based camera and introduce a new event-based optical tactile sensor called Evetac.

Benchmarking

Learning Multimodal Latent Dynamics for Human-Robot Interaction

no code implementations27 Nov 2023 Vignesh Prasad, Lea Heitlinger, Dorothea Koert, Ruth Stock-Homburg, Jan Peters, Georgia Chalvatzaki

The generated robot motions are further adapted with Inverse Kinematics to ensure the desired physical proximity with a human, combining the ease of joint space learning and accurate task space reachability.

Domain Randomization via Entropy Maximization

no code implementations3 Nov 2023 Gabriele Tiboni, Pascal Klink, Jan Peters, Tatiana Tommasi, Carlo D'Eramo, Georgia Chalvatzaki

Varying dynamics parameters in simulation is a popular Domain Randomization (DR) approach for overcoming the reality gap in Reinforcement Learning (RL).

Diversity Reinforcement Learning (RL)

Robust Adversarial Reinforcement Learning via Bounded Rationality Curricula

no code implementations3 Nov 2023 Aryaman Reddi, Maximilian Tölle, Jan Peters, Georgia Chalvatzaki, Carlo D'Eramo

To this end, Robust Adversarial Reinforcement Learning (RARL) trains a protagonist against destabilizing forces exercised by an adversary in a competitive zero-sum Markov game, whose optimal solution, i. e., rational strategy, corresponds to a Nash equilibrium.

reinforcement-learning Reinforcement Learning +1

Active-Perceptive Motion Generation for Mobile Manipulation

no code implementations30 Sep 2023 Snehal Jauhri, Sophie Lueth, Georgia Chalvatzaki

In this work, we introduce an active perception pipeline for mobile manipulators to generate motions that are informative toward manipulation tasks, such as grasping in unknown, cluttered scenes.

Motion Generation

Learning Any-View 6DoF Robotic Grasping in Cluttered Scenes via Neural Surface Rendering

no code implementations Robotics: Science & Systems 2024 Snehal Jauhri, Ishikaa Lunawat, Georgia Chalvatzaki

A significant challenge for real-world robotic manipulation is the effective 6DoF grasping of objects in cluttered scenes from any single viewpoint without the need for additional scene exploration.

Grasp Generation Robotic Grasping

Hierarchical Policy Blending As Optimal Transport

no code implementations4 Dec 2022 An T. Le, Kay Hansel, Jan Peters, Georgia Chalvatzaki

We present hierarchical policy blending as optimal transport (HiPBOT).

Active Exploration for Robotic Manipulation

no code implementations23 Oct 2022 Tim Schneider, Boris Belousov, Georgia Chalvatzaki, Diego Romeres, Devesh K. Jha, Jan Peters

Robotic manipulation stands as a largely unsolved problem despite significant advances in robotics and machine learning in recent years.

Model-based Reinforcement Learning Model Predictive Control

MILD: Multimodal Interactive Latent Dynamics for Learning Human-Robot Interaction

no code implementations22 Oct 2022 Vignesh Prasad, Dorothea Koert, Ruth Stock-Homburg, Jan Peters, Georgia Chalvatzaki

Modeling interaction dynamics to generate robot trajectories that enable a robot to adapt and react to a human's actions and intentions is critical for efficient and effective collaborative Human-Robot Interactions (HRI).

Representation Learning

Hierarchical Policy Blending as Inference for Reactive Robot Control

no code implementations14 Oct 2022 Kay Hansel, Julen Urain, Jan Peters, Georgia Chalvatzaki

To combine the benefits of reactive policies and planning, we propose a hierarchical motion generation method.

Decision Making Motion Generation +1

Entropy-driven Unsupervised Keypoint Representation Learning in Videos

1 code implementation30 Sep 2022 Ali Younes, Simone Schaub-Meyer, Georgia Chalvatzaki

Two original information-theoretic losses, computed from local entropy, guide our model to discover consistent keypoint representations; a loss that maximizes the spatial information covered by the keypoints and a loss that optimizes the keypoints' information transportation over time.

Representation Learning

Safe Reinforcement Learning of Dynamic High-Dimensional Robotic Tasks: Navigation, Manipulation, Interaction

no code implementations27 Sep 2022 Puze Liu, Kuo Zhang, Davide Tateo, Snehal Jauhri, Zhiyuan Hu, Jan Peters, Georgia Chalvatzaki

Our proposed approach achieves state-of-the-art performance in simulated high-dimensional and dynamic tasks while avoiding collisions with the environment.

reinforcement-learning Reinforcement Learning +3

SE(3)-DiffusionFields: Learning smooth cost functions for joint grasp and motion optimization through diffusion

1 code implementation8 Sep 2022 Julen Urain, Niklas Funk, Jan Peters, Georgia Chalvatzaki

In this work, we focus on learning SE(3) diffusion models for 6DoF grasping, giving rise to a novel framework for joint grasp and motion optimization without needing to decouple grasp selection from trajectory generation.

Motion Planning Robot Manipulation

Learning Implicit Priors for Motion Optimization

no code implementations11 Apr 2022 Julen Urain, An T. Le, Alexander Lambert, Georgia Chalvatzaki, Byron Boots, Jan Peters

In this paper, we focus on the problem of integrating Energy-based Models (EBM) as guiding priors for motion optimization.

Robot Navigation

Accelerating Integrated Task and Motion Planning with Neural Feasibility Checking

no code implementations20 Mar 2022 Lei Xu, Tianyu Ren, Georgia Chalvatzaki, Jan Peters

Task and Motion Planning (TAMP) provides a hierarchical framework to handle the sequential nature of manipulation tasks by interleaving a symbolic task planner that generates a possible action sequence, with a motion planner that checks the kinematic feasibility in the geometric world, generating robot trajectories if several constraints are satisfied, e. g., a collision-free trajectory from one state to another.

Motion Planning Task and Motion Planning

Model Predictive Actor-Critic: Accelerating Robot Skill Acquisition with Deep Reinforcement Learning

1 code implementation25 Mar 2021 Andrew S. Morgan, Daljeet Nandha, Georgia Chalvatzaki, Carlo D'Eramo, Aaron M. Dollar, Jan Peters

Substantial advancements to model-based reinforcement learning algorithms have been impeded by the model-bias induced by the collected data, which generally hurts performance.

Model-based Reinforcement Learning Model Predictive Control +3

Extended Tree Search for Robot Task and Motion Planning

1 code implementation9 Mar 2021 Tianyu Ren, Georgia Chalvatzaki, Jan Peters

Moreover, we effectively combine this skeleton space with the resultant motion variable spaces into a single extended decision space.

Decision Making Motion Planning +1

Orientation Attentive Robotic Grasp Synthesis with Augmented Grasp Map Representation

1 code implementation9 Jun 2020 Georgia Chalvatzaki, Nikolaos Gkanatsios, Petros Maragos, Jan Peters

Inherent morphological characteristics in objects may offer a wide range of plausible grasping orientations that obfuscates the visual learning of robotic grasping.

Grasp Generation Robotic Grasping

How to track your dragon: A Multi-Attentional Framework for real-time RGB-D 6-DOF Object Pose Tracking

1 code implementation21 Apr 2020 Isidoros Marougkas, Petros Koutras, Nikos Kardaris, Georgios Retsinas, Georgia Chalvatzaki, Petros Maragos

We present a novel multi-attentional convolutional architecture to tackle the problem of real-time RGB-D 6D object pose tracking of single, known objects.

Data Augmentation Object Tracking +3

LSTM-based Network for Human Gait Stability Prediction in an Intelligent Robotic Rollator

no code implementations1 Dec 2018 Georgia Chalvatzaki, Petros Koutras, Jack Hadfield, Xanthi S. Papageorgiou, Costas S. Tzafestas, Petros Maragos

In this work, we present a novel framework for on-line human gait stability prediction of the elderly users of an intelligent robotic rollator using Long Short Term Memory (LSTM) networks, fusing multimodal RGB-D and Laser Range Finder (LRF) data from non-wearable sensors.

Decoder Pose Estimation

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