19 citations · 27 across the 26 of their papers we have counts for
27 papers
Policy-Invariant Reward Shaping from LLM Feedback: A Framework for Hybrid RL Agents
Christophe D. Hounwanou, John Emeka Eze, Yaé U. Gaba
Combining large language models with reinforcement learning is increasingly explored, yet the theoretical status of LLM-derived reward signals is often left implicit. We formalize…
Hybrid LLM-Augmented Reinforcement Learning Agents for Complex Sequential Decision Tasks
Christophe D. Hounwanou, John Emeka Eze, Yaé Ulrich Gaba
Large Language Models (LLMs) have recently shown strong capabilities in reasoning, planning, and tool-use, enabling new forms of autonomous agents. However, LLM-based agents strugg…
Geometric turbulence: a geodesic-regression crisis indicator for equity covariance dynamics, with evidence from African markets
E. B. Camara, Y. U. Gaba, I. G. M. Nsiloulou
The covariance matrix of a basket of assets is a symmetric positive-definite object that evolves on a curved manifold, not on a flat vector space. Standard linear regression on its…
A matched-integrator evaluation of Hamiltonian neural networks on pendulum and Kepler dynamics
Lenick Kemunto Nyabuto, Yae Ulrich Gaba, Birahim Tewe
Hamiltonian Neural Networks (HNNs) parameterize conservative dynamics through a learned scalar Hamiltonian, providing an architectural prior that is absent from generic vector-fiel…
On -startpoints and -fixed points in quasi-uniform spaces: a revisit and extensions
Yaé U. Gaba
We extend the $\U$-fixed-point and $\U$-startpoint framework for quasi-uniform spaces. We reformulate the original existence framework through the filter axioms and supply a two-si…
Expansive homeomorphisms on complexity quasi-metric spaces
Yaé U. Gaba
The complexity quasi-metric of Schellekens is a topological framework in which the asymmetry of computational comparisons -- `` is at most as fast as '' carrying different in…
Intelligent resource allocation in wireless networks via deep reinforcement learning
Marie Diane Iradukunda, Chabi F. Elégbédé, Yaé Ulrich Gaba
This study addresses the challenge of optimal power allocation in stochastic wireless networks by employing a Deep Reinforcement Learning (DRL) framework. Specifically, we design a…
Deep Generative Models for Synthetic Financial Data: Applications to Portfolio and Risk Modeling
Christophe D. Hounwanou, Yae Ulrich Gaba
Synthetic financial data provides a practical solution to the privacy, accessibility, and reproducibility challenges that often constrain empirical research in quantitative finance…
Synthetic Financial Data Generation for Enhanced Financial Modelling
Christophe D. Hounwanou, Yae Ulrich Gaba, Pierre Ntakirutimana
Data scarcity and confidentiality in finance often impede model development and robust testing. This paper presents a unified multi-criteria evaluation framework for synthetic fina…
On Fixed Point Theorems in Bipolar Metric Spaces Involving Polynomial-Type Contractions
Gopinath Janardhanan, Gunaseelan Mani, Nancy Delaila John Kennedy +1
In this paper, we investigate the existence and uniqueness of fixed points for self-mappings defined on bipolar metric spaces using a new class of contractive conditions, namely po…
Bellman operator convergence enhancements in reinforcement learning algorithms
David Krame Kadurha, Domini Jocema Leko Moutouo, Yae Ulrich Gaba
This paper reviews the topological groundwork for the study of reinforcement learning (RL) by focusing on the structure of state, action, and policy spaces. We begin by recalling k…
Quasi-uniform type spaces
Yaé Ulrich Gaba
In this article, we introduce and investigate the concept of partial quasi-metric type space as a generalization of both partial quasi-metric and quasi-metric type spaces. We show…
A new characterization of partial metric completeness
Yaé Ulrich Gaba
In this article, we present a new characterization of the completeness of a partial metric space--which we call \textit{orbital characterization}-- using fixed point results.
Partial quasi-metric completeness via Kannan-type fixed points
Yaé Ulrich Gaba
In this short note, we obtain partial quasi-metric versions of Kannan's fixed point theorem for self-mappings. Moreover, we use these fixed points results to characterize a certain…
Chatterjea type fixed point in Partial -metric spaces
Yaé Ulrich Gaba, Collins Amburo Agyingi, Domini Jocema Leko
In this paper, we give and prove two Chatterjea type fixed point theorems on partial -metric space. We propose an extension to the Banach contraction principle on partial -me…
Fixed point on partial metric type spaces
Yaé Ulrich Gaba
In this paper, we study some new fixed point results for self maps defined on partial metric type spaces. In particular, we give common fixed point theorems in the same setting. So…
Startpoints via weak contractions
Collins Amburo Agyingi, Yaé Ulrich Gaba
Startpoints (resp. endpoints) can be defined as "oriented fixed points". They arise naturally in the study of fixed for multi-valued maps defined on quasi-metric spaces. In this ar…
Weak contractions via -sequences
Collins Amburo Agyingi, Yaé Ulrich Gaba
In this note, we discuss common fixed point for a family of self mapping defined on a metric type space and satisfying a weakly contractive condition. In our development, we make u…
-metric structures
Yaé Ulrich Gaba
In this paper, we discuss recent results about generalized metric spaces and fixed point theory. We introduce the notion of -cone metric spaces, give some topological properties…
(-order Fixed points in -metric spaces
Yaé Ulrich Gaba, Collins Amburo Agyingi
We establish three major fixed-point theorems for functions satisfying an odd power type contractive condition in G-metric spaces. We first consider the case of a single mapping, f…
-tuple fixed point in -ordered -metric spaces
Yaé Ulrich Gaba, Collins Amburo Agyingi
We use three seminal approaches in the study of fixed point theory, the so called -metrics, multidimensional fixed points and partially ordered spaces. More precisely, we extend…
-admissible functions in quasi-pseudometric type spaces
Yaé Ulrich Gaba
In this article, we give some fixed point results in left -complete quasi-pseudometric type spaces for self-mappings that are -admissible.
Advances in Startpoint Theory for quasi-pseudometric spaces
Yaé Ulrich Gaba
This paper presents some startpoint (endpoint, fixed point) theorems for mutli-valued maps that generalize recent results proved by Y. U. Gaba \cite{rico, ricoo}.
Common Coupled Fixed Point Theorems for Maps in a -ultra-quasi-metric Space
Collins Amburo Agyingi, Yaé Ulrich Gaba
In this article, we prove the existence of common fixed points for a pair of maps on a -spherically complete -ultra-quasi-metric space. The present article is a generalizat…