Search Results for author: Alexander I. Cowen-Rivers

Found 12 papers, 8 papers with code

Effects of Safety State Augmentation on Safe Exploration

1 code implementation6 Jun 2022 Aivar Sootla, Alexander I. Cowen-Rivers, Jun Wang, Haitham Bou Ammar

We further show that Simmer can stabilize training and improve the performance of safe RL with average constraints.

Reinforcement Learning (RL) Safe Exploration +1

Saute RL: Almost Surely Safe Reinforcement Learning Using State Augmentation

1 code implementation14 Feb 2022 Aivar Sootla, Alexander I. Cowen-Rivers, Taher Jafferjee, Ziyan Wang, David Mguni, Jun Wang, Haitham Bou-Ammar

Satisfying safety constraints almost surely (or with probability one) can be critical for the deployment of Reinforcement Learning (RL) in real-life applications.

reinforcement-learning Reinforcement Learning (RL) +1

SAMBA: Safe Model-Based & Active Reinforcement Learning

1 code implementation12 Jun 2020 Alexander I. Cowen-Rivers, Daniel Palenicek, Vincent Moens, Mohammed Abdullah, Aivar Sootla, Jun Wang, Haitham Ammar

In this paper, we propose SAMBA, a novel framework for safe reinforcement learning that combines aspects from probabilistic modelling, information theory, and statistics.

Reinforcement Learning (RL) Safe Reinforcement Learning

Emergent Communication with World Models

no code implementations22 Feb 2020 Alexander I. Cowen-Rivers, Jason Naradowsky

This provides a visual grounding of the message, similar to an enhanced observation of the world, which may include objects outside of the listening agent's field-of-view.

Visual Grounding

Compositional ADAM: An Adaptive Compositional Solver

no code implementations10 Feb 2020 Rasul Tutunov, Minne Li, Alexander I. Cowen-Rivers, Jun Wang, Haitham Bou-Ammar

In this paper, we present C-ADAM, the first adaptive solver for compositional problems involving a non-linear functional nesting of expected values.

Meta-Learning

Neural Variational Inference For Estimating Uncertainty in Knowledge Graph Embeddings

1 code implementation12 Jun 2019 Alexander I. Cowen-Rivers, Pasquale Minervini, Tim Rocktaschel, Matko Bosnjak, Sebastian Riedel, Jun Wang

Recent advances in Neural Variational Inference allowed for a renaissance in latent variable models in a variety of domains involving high-dimensional data.

Knowledge Graph Embeddings Knowledge Graphs +2

Neural Variational Inference For Embedding Knowledge Graphs

no code implementations ICLR 2019 Alexander I. Cowen-Rivers, Pasquale Minervini

While traditional variational methods derive an analytical approximation for the intractable distribution over the latent variables, here we construct an inference network conditioned on the symbolic representation of entities and relation types in the Knowledge Graph, to provide the variational distributions.

Knowledge Graphs Variational Inference

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