Search Results for author: Dimitrios Rafailidis

Found 15 papers, 5 papers with code

Multi-Task Learning with Loop Specific Attention for CDR Structure Prediction

no code implementations22 Jun 2023 Eleni Giovanoudi, Dimitrios Rafailidis

Compared with the other CDR loops, that is the H1 and H2 loops, the CDR structure of the H3 loop is more challenging due to its varying length and flexible structure.

Multi-Task Learning

Meta-Reinforcement Learning via Buffering Graph Signatures for Live Video Streaming Events

1 code implementation3 Oct 2021 Stefanos Antaris, Dimitrios Rafailidis, Sarunas Girdzijauskas

By considering a new event as a task, we design an actor-critic learning scheme to compute the optimal policy on estimating the viewers' high-bandwidth connections.

Meta-Learning Meta Reinforcement Learning +2

Sequence Adaptation via Reinforcement Learning in Recommender Systems

1 code implementation31 Jul 2021 Stefanos Antaris, Dimitrios Rafailidis

This might limit the recommendation accuracy, as in practice users follow different trends on the sequential recommendations.

Recommendation Systems reinforcement-learning +1

A Deep Graph Reinforcement Learning Model for Improving User Experience in Live Video Streaming

no code implementations28 Jul 2021 Stefanos Antaris, Dimitrios Rafailidis, Sarunas Girdzijauskas

We first formulate the user experience prediction problem as a classification task, accounting for the fact that most of the viewers at the beginning of an event have poor quality of experience due to low-bandwidth connections and limited interactions with the tracker.

Reinforcement Learning (RL)

Multi-Task Learning for User Engagement and Adoption in Live Video Streaming Events

no code implementations18 Jun 2021 Stefanos Antaris, Dimitrios Rafailidis, Romina Arriaza

Nowadays, live video streaming events have become a mainstay in viewer's communication in large international enterprises.

Multi-Task Learning

VStreamDRLS: Dynamic Graph Representation Learning with Self-Attention for Enterprise Distributed Video Streaming Solutions

1 code implementation11 Nov 2020 Stefanos Antaris, Dimitrios Rafailidis

We propose VStreamDRLS, a graph neural network architecture with a self-attention mechanism to capture the evolution of the graph structure of live video streaming events.

Graph Representation Learning Link Prediction

Distill2Vec: Dynamic Graph Representation Learning with Knowledge Distillation

1 code implementation11 Nov 2020 Stefanos Antaris, Dimitrios Rafailidis

In this study we propose Distill2Vec, a knowledge distillation strategy to train a compact model with a low number of trainable parameters, so as to reduce the latency of online inference and maintain the model accuracy high.

Graph Representation Learning Knowledge Distillation +1

Adaptive Neural Architectures for Recommender Systems

no code implementations11 Nov 2020 Dimitrios Rafailidis, Stefanos Antaris

The main drawback of deep reinforcement strategies is that are based on predefined and fixed neural architectures.

Recommendation Systems reinforcement-learning +1

On Estimating the Training Cost of Conversational Recommendation Systems

no code implementations10 Nov 2020 Stefanos Antaris, Dimitrios Rafailidis, Mohammad Aliannejadi

Conversational recommendation systems have recently gain a lot of attention, as users can continuously interact with the system over multiple conversational turns.

Knowledge Distillation Recommendation Systems

A Joint Two-Phase Time-Sensitive Regularized Collaborative Ranking Model for Point of Interest Recommendation

no code implementations16 Sep 2019 Mohammad Aliannejadi, Dimitrios Rafailidis, Fabio Crestani

In this article, we propose a two-phase CR algorithm that incorporates the geographical influence of POIs and is regularized based on the variance of POIs popularity and users' activities over time.

Collaborative Ranking

Cross-Domain Collaborative Filtering via Translation-based Learning

no code implementations11 Aug 2019 Dimitrios Rafailidis

In our model, we learn the embedding space with translation vectors and capture high-order feature interactions in users' multiple preferences across domains.

Collaborative Filtering Translation

A Neural Attention Model for Adaptive Learning of Social Friends' Preferences

no code implementations29 Jun 2019 Dimitrios Rafailidis, Gerhard Weiss

Furthermore, we study the effect of the proposed social behavioral attention mechanism and show that it is a key factor to our model's performance.

Collaborative Filtering Recommendation Systems

Adaptive Deep Learning of Cross-Domain Loss in Collaborative Filtering

no code implementations29 Jun 2019 Dimitrios Rafailidis, Gerhard Weiss

In this paper, we propose an adaptive deep learning strategy for cross-domain recommendation, referred to as ADC.

Collaborative Filtering

Leveraging Trust and Distrust in Recommender Systems via Deep Learning

no code implementations31 May 2019 Dimitrios Rafailidis

We show that our deep learning strategy plays an important role in capturing the nonlinear correlations between user preferences and the social information of trust and distrust relationships, and demonstrate the importance of our social negative sampling strategy on the proposed model.

Collaborative Filtering Recommendation Systems

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