Search Results for author: Ioannis Arapakis

Found 16 papers, 6 papers with code

Reinforcement Learning-based Recommender Systems with Large Language Models for State Reward and Action Modeling

no code implementations25 Mar 2024 Jie Wang, Alexandros Karatzoglou, Ioannis Arapakis, Joemon M. Jose

The LE is learned from a subset of user-item interaction data, thus reducing the need for large training data, and can synthesise user feedback for offline data by: (i) acting as a state model that produces high quality states that enrich the user representation, and (ii) functioning as a reward model to accurately capture nuanced user preferences on actions.

Offline RL Reinforcement Learning (RL) +1

LightningNet: Distributed Graph-based Cellular Network Performance Forecasting for the Edge

no code implementations8 Feb 2024 Konstantinos Zacharopoulos, Georgios Koutroumpas, Ioannis Arapakis, Konstantinos Georgopoulos, Javad Khangosstar, Sotiris Ioannidis

The cellular network plays a pivotal role in providing Internet access, since it is the only global-scale infrastructure with ubiquitous mobility support.

P4L: Privacy Preserving Peer-to-Peer Learning for Infrastructureless Setups

no code implementations26 Feb 2023 Ioannis Arapakis, Panagiotis Papadopoulos, Kleomenis Katevas, Diego Perino

Distributed (or Federated) learning enables users to train machine learning models on their very own devices, while they share only the gradients of their models usually in a differentially private way (utility loss).

Federated Learning Privacy Preserving

Supervised Advantage Actor-Critic for Recommender Systems

no code implementations5 Nov 2021 Xin Xin, Alexandros Karatzoglou, Ioannis Arapakis, Joemon M. Jose

However, the direct use of RL algorithms in the RS setting is impractical due to challenges like off-policy training, huge action spaces and lack of sufficient reward signals.

Q-Learning Reinforcement Learning (RL) +1

Choosing the Best of Both Worlds: Diverse and Novel Recommendations through Multi-Objective Reinforcement Learning

no code implementations28 Oct 2021 Dusan Stamenkovic, Alexandros Karatzoglou, Ioannis Arapakis, Xin Xin, Kleomenis Katevas

The proposed SMORL agent augments standard recommendation models with additional RL layers that enforce it to simultaneously satisfy three principal objectives: accuracy, diversity, and novelty of recommendations.

Multi-Objective Reinforcement Learning reinforcement-learning +2

Graph Convolutional Embeddings for Recommender Systems

no code implementations5 Mar 2021 Paula Gómez Duran, Alexandros Karatzoglou, Jordi Vitrià, Xin Xin, Ioannis Arapakis

In this work, we generalize the use of GCNs for N-partite graphs by considering N multiple context dimensions and propose a simple way for their seamless integration in modern deep learning RS architectures.

Collaborative Filtering Recommendation Systems

My Mouse, My Rules: Privacy Issues of Behavioral User Profiling via Mouse Tracking

1 code implementation22 Jan 2021 Luis A. Leiva, Ioannis Arapakis, Costas Iordanou

This paper aims to stir debate about a disconcerting privacy issue on web browsing that could easily emerge because of unethical practices and uncontrolled use of technology.

Impact of Response Latency on User Behaviour in Mobile Web Search

no code implementations22 Jan 2021 Ioannis Arapakis, Souneil Park, Martin Pielot

Traditionally, the efficiency and effectiveness of search systems have both been of great interest to the information retrieval community.

Information Retrieval Retrieval

Query Abandonment Prediction with Recurrent Neural Models of Mouse Cursor Movements

1 code implementation22 Jan 2021 Lukas Brückner, Ioannis Arapakis, Luis A. Leiva

Most successful search queries do not result in a click if the user can satisfy their information needs directly on the SERP.

Learning Efficient Representations of Mouse Movements to Predict User Attention

1 code implementation30 May 2020 Ioannis Arapakis, Luis A. Leiva

Tracking mouse cursor movements can be used to predict user attention on heterogeneous page layouts like SERPs.

Re-Ranking Time Series +1

Graph Highway Networks

1 code implementation9 Apr 2020 Xin Xin, Alexandros Karatzoglou, Ioannis Arapakis, Joemon M. Jose

Graph Convolution Networks (GCN) are widely used in learning graph representations due to their effectiveness and efficiency.

A Price-Per-Attention Auction Scheme Using Mouse Cursor Information

no code implementations21 Jan 2020 Ioannis Arapakis, Antonio Penta, Hideo Joho, Luis A. Leiva

There is thus an opportunity to devise a more effective ad pricing paradigm, in which ads are paid only if they are actually noticed.

A Simple Convolutional Generative Network for Next Item Recommendation

3 code implementations15 Aug 2018 Fajie Yuan, Alexandros Karatzoglou, Ioannis Arapakis, Joemon M. Jose, Xiangnan He

Convolutional Neural Networks (CNNs) have been recently introduced in the domain of session-based next item recommendation.

Recommendation Systems

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