Search Results for author: Alexandros Potamianos

Found 31 papers, 17 papers with code

The Strong Pull of Prior Knowledge in Large Language Models and Its Impact on Emotion Recognition

no code implementations25 Mar 2024 Georgios Chochlakis, Alexandros Potamianos, Kristina Lerman, Shrikanth Narayanan

The promise of ICL is that the LLM can adapt to perform the present task at a competitive or state-of-the-art level at a fraction of the cost.

Emotion Recognition In-Context Learning

PowMix: A Versatile Regularizer for Multimodal Sentiment Analysis

no code implementations19 Dec 2023 Efthymios Georgiou, Yannis Avrithis, Alexandros Potamianos

Multimodal sentiment analysis (MSA) leverages heterogeneous data sources to interpret the complex nature of human sentiments.

Multimodal Sentiment Analysis

Multi-User MultiWOZ: Task-Oriented Dialogues among Multiple Users

1 code implementation31 Oct 2023 Yohan Jo, Xinyan Zhao, Arijit Biswas, Nikoletta Basiou, Vincent Auvray, Nikolaos Malandrakis, Angeliki Metallinou, Alexandros Potamianos

While most task-oriented dialogues assume conversations between the agent and one user at a time, dialogue systems are increasingly expected to communicate with multiple users simultaneously who make decisions collaboratively.

Decision Making Dialogue State Tracking

From West to East: Who can understand the music of the others better?

1 code implementation19 Jul 2023 Charilaos Papaioannou, Emmanouil Benetos, Alexandros Potamianos

This leads to research questions on whether these models can be used to learn representations for different music cultures and styles, or whether we can build similar music audio embedding models trained on data from different cultures or styles.

Transfer Learning

Self-Attention Based Generative Adversarial Networks For Unsupervised Video Summarization

no code implementations16 Jul 2023 Maria Nektaria Minaidi, Charilaos Papaioannou, Alexandros Potamianos

Experimental results indicate that using a self-attention mechanism as the frame selection mechanism outperforms the state-of-the-art on SumMe and leads to comparable to state-of-the-art performance on TVSum and COGNIMUSE.

Generative Adversarial Network Unsupervised Video Summarization

SeqAug: Sequential Feature Resampling as a modality agnostic augmentation method

no code implementations3 May 2023 Efthymios Georgiou, Alexandros Potamianos

Data augmentation is a prevalent technique for improving performance in various machine learning applications.

Data Augmentation

Efficient Audio Captioning Transformer with Patchout and Text Guidance

no code implementations6 Apr 2023 Thodoris Kouzelis, Grigoris Bastas, Athanasios Katsamanis, Alexandros Potamianos

The results show that the proposed techniques improve the performance of our system and while reducing the computational complexity.

Audio captioning Caption Generation +3

Depression detection in social media posts using affective and social norm features

no code implementations24 Mar 2023 Ilias Triantafyllopoulos, Georgios Paraskevopoulos, Alexandros Potamianos

Motivated by psychological literature we propose to incorporate profanity and morality features of posts and words in our architecture using a late fusion scheme.

Depression Detection Emotion Recognition

Alternating Objectives Generates Stronger PGD-Based Adversarial Attacks

no code implementations15 Dec 2022 Nikolaos Antoniou, Efthymios Georgiou, Alexandros Potamianos

Designing powerful adversarial attacks is of paramount importance for the evaluation of $\ell_p$-bounded adversarial defenses.

Adversarial Attack

A Dataset for Greek Traditional and Folk Music: Lyra

1 code implementation21 Nov 2022 Charilaos Papaioannou, Ioannis Valiantzas, Theodoros Giannakopoulos, Maximos Kaliakatsos-Papakostas, Alexandros Potamianos

The content has been collected from a Greek documentary series that is available online, where academics present music traditions of Greece with live music and dance performance during the show, along with discussions about social, cultural and musicological aspects of the presented music.

Regotron: Regularizing the Tacotron2 architecture via monotonic alignment loss

no code implementations28 Apr 2022 Efthymios Georgiou, Kosmas Kritsis, Georgios Paraskevopoulos, Athanasios Katsamanis, Vassilis Katsouros, Alexandros Potamianos

Recent deep learning Text-to-Speech (TTS) systems have achieved impressive performance by generating speech close to human parity.

MMLatch: Bottom-up Top-down Fusion for Multimodal Sentiment Analysis

1 code implementation24 Jan 2022 Georgios Paraskevopoulos, Efthymios Georgiou, Alexandros Potamianos

Current deep learning approaches for multimodal fusion rely on bottom-up fusion of high and mid-level latent modality representations (late/mid fusion) or low level sensory inputs (early fusion).

Ranked #7 on Multimodal Sentiment Analysis on CMU-MOSEI (using extra training data)

Multimodal Sentiment Analysis

EmpBot: A T5-based Empathetic Chatbot focusing on Sentiments

no code implementations30 Oct 2021 Emmanouil Zaranis, Georgios Paraskevopoulos, Athanasios Katsamanis, Alexandros Potamianos

Specifically, during finetuning we propose to use three objectives: response language modeling, sentiment understanding, and empathy forcing.

Chatbot Language Modelling

Unsupervised low-rank representations for speech emotion recognition

no code implementations14 Apr 2021 Georgios Paraskevopoulos, Efthymios Tzinis, Nikolaos Ellinas, Theodoros Giannakopoulos, Alexandros Potamianos

We examine the use of linear and non-linear dimensionality reduction algorithms for extracting low-rank feature representations for speech emotion recognition.

Dimensionality Reduction General Classification +1

End-to-end Generative Zero-shot Learning via Few-shot Learning

1 code implementation8 Feb 2021 Georgios Chochlakis, Efthymios Georgiou, Alexandros Potamianos

In this work, we introduce Z2FSL, an end-to-end generative ZSL framework that uses such an approach as a backbone and feeds its synthesized output to a Few-Shot Learning (FSL) algorithm.

Few-Shot Learning Zero-Shot Learning

Attention-based Conditioning Methods for External Knowledge Integration

1 code implementation ACL 2019 Katerina Margatina, Christos Baziotis, Alexandros Potamianos

This form of conditioning on the attention distribution, enforces the contribution of the most salient words for the task at hand.

Cross-topic distributional semantic representations via unsupervised mappings

no code implementations NAACL 2019 Eleftheria Briakou, Nikos Athanasiou, Alexandros Potamianos

In traditional Distributional Semantic Models (DSMs) the multiple senses of a polysemous word are conflated into a single vector space representation.

Word Similarity

SEQ^3: Differentiable Sequence-to-Sequence-to-Sequence Autoencoder for Unsupervised Abstractive Sentence Compression

1 code implementation7 Apr 2019 Christos Baziotis, Ion Androutsopoulos, Ioannis Konstas, Alexandros Potamianos

The proposed model does not require parallel text-summary pairs, achieving promising results in unsupervised sentence compression on benchmark datasets.

Language Modelling Sentence +1

Integrating Recurrence Dynamics for Speech Emotion Recognition

1 code implementation9 Nov 2018 Efthymios Tzinis, Georgios Paraskevopoulos, Christos Baziotis, Alexandros Potamianos

We investigate the performance of features that can capture nonlinear recurrence dynamics embedded in the speech signal for the task of Speech Emotion Recognition (SER).

Emotion Recognition in Conversation Speech Emotion Recognition

Pattern Search Multidimensional Scaling

1 code implementation1 Jun 2018 Georgios Paraskevopoulos, Efthymios Tzinis, Emmanouil-Vasileios Vlatakis-Gkaragkounis, Alexandros Potamianos

We present a novel view of nonlinear manifold learning using derivative-free optimization techniques.

Structural Attention Neural Networks for improved sentiment analysis

no code implementations EACL 2017 Filippos Kokkinos, Alexandros Potamianos

We introduce a tree-structured attention neural network for sentences and small phrases and apply it to the problem of sentiment classification.

General Classification Sentiment Analysis +1

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