Search Results for author: Tomasz Kajdanowicz

Found 31 papers, 18 papers with code

Representation learning in multiplex graphs: Where and how to fuse information?

1 code implementation27 Feb 2024 Piotr Bielak, Tomasz Kajdanowicz

In recent years, unsupervised and self-supervised graph representation learning has gained popularity in the research community.

Graph Representation Learning

Unveiling the Potential of Probabilistic Embeddings in Self-Supervised Learning

no code implementations27 Oct 2023 Denis Janiak, Jakub Binkowski, Piotr Bielak, Tomasz Kajdanowicz

In recent years, self-supervised learning has played a pivotal role in advancing machine learning by allowing models to acquire meaningful representations from unlabeled data.

Out-of-Distribution Detection Self-Supervised Learning

Similarity-based Memory Enhanced Joint Entity and Relation Extraction

1 code implementation14 Jul 2023 Witold Kosciukiewicz, Mateusz Wojcik, Tomasz Kajdanowicz, Adam Gonczarek

Document-level joint entity and relation extraction is a challenging information extraction problem that requires a unified approach where a single neural network performs four sub-tasks: mention detection, coreference resolution, entity classification, and relation extraction.

coreference-resolution Joint Entity and Relation Extraction +2

RAFEN -- Regularized Alignment Framework for Embeddings of Nodes

1 code implementation3 Mar 2023 Kamil Tagowski, Piotr Bielak, Jakub Binkowski, Tomasz Kajdanowicz

A well-defined node embedding model should reflect both node features and the graph structure in the final embedding.

Graph-level representations using ensemble-based readout functions

1 code implementation3 Mar 2023 Jakub Binkowski, Albert Sawczyn, Denis Janiak, Piotr Bielak, Tomasz Kajdanowicz

Graph machine learning models have been successfully deployed in a variety of application areas.

This is the way: designing and compiling LEPISZCZE, a comprehensive NLP benchmark for Polish

1 code implementation23 Nov 2022 Łukasz Augustyniak, Kamil Tagowski, Albert Sawczyn, Denis Janiak, Roman Bartusiak, Adrian Szymczak, Marcin Wątroba, Arkadiusz Janz, Piotr Szymański, Mikołaj Morzy, Tomasz Kajdanowicz, Maciej Piasecki

In this paper, we introduce LEPISZCZE (the Polish word for glew, the Middle English predecessor of glue), a new, comprehensive benchmark for Polish NLP with a large variety of tasks and high-quality operationalization of the benchmark.

Benchmarking

Assessment of Massively Multilingual Sentiment Classifiers

no code implementations WASSA (ACL) 2022 Krzysztof Rajda, Łukasz Augustyniak, Piotr Gramacki, Marcin Gruza, Szymon Woźniak, Tomasz Kajdanowicz

We use these to assess 11 models and 80 high-quality sentiment datasets (out of 342 raw datasets collected) in 27 languages and included results on the internally annotated datasets.

Sentiment Analysis

Spatial Data Mining of Public Transport Incidents reported in Social Media

1 code implementation11 Oct 2021 Kamil Raczycki, Marcin Szymański, Yahor Yeliseyenka, Piotr Szymański, Tomasz Kajdanowicz

We successfully build an information type classifier for social media posts, detect stop names in posts, and relate them to GPS coordinates, obtaining a spatial understanding of long-term aggregated phenomena.

Graph Barlow Twins: A self-supervised representation learning framework for graphs

1 code implementation4 Jun 2021 Piotr Bielak, Tomasz Kajdanowicz, Nitesh V. Chawla

The self-supervised learning (SSL) paradigm is an essential exploration area, which tries to eliminate the need for expensive data labeling.

Contrastive Learning Graph Representation Learning +1

AttrE2vec: Unsupervised Attributed Edge Representation Learning

no code implementations29 Dec 2020 Piotr Bielak, Tomasz Kajdanowicz, Nitesh V. Chawla

Representation learning has overcome the often arduous and manual featurization of networks through (unsupervised) feature learning as it results in embeddings that can apply to a variety of downstream learning tasks.

Clustering Edge Classification +1

UCSG-Net -- Unsupervised Discovering of Constructive Solid Geometry Tree

1 code implementation16 Jun 2020 Kacper Kania, Maciej Zięba, Tomasz Kajdanowicz

On the contrary, we propose a model that extracts a CSG parse tree without any supervision - UCSG-Net.

3D Shape Reconstruction

Extracting Aspects Hierarchies using Rhetorical Structure Theory

no code implementations4 Sep 2019 Łukasz Augustyniak, Tomasz Kajdanowicz, Przemysław Kazienko

We propose a novel approach to generate aspect hierarchies that proved to be consistently correct compared with human-generated hierarchies.

Sentiment Analysis

Aspect Detection using Word and Char Embeddings with (Bi)LSTM and CRF

1 code implementation3 Sep 2019 Łukasz Augustyniak, Tomasz Kajdanowicz, Przemysław Kazienko

We proposed a~new accurate aspect extraction method that makes use of both word and character-based embeddings.

Aspect Extraction Word Embeddings

FILDNE: A Framework for Incremental Learning of Dynamic Networks Embeddings

1 code implementation6 Apr 2019 Piotr Bielak, Kamil Tagowski, Maciej Falkiewicz, Tomasz Kajdanowicz, Nitesh V. Chawla

Experimental results on several downstream tasks, over seven real-world data sets, show that FILDNE is able to reduce memory and computational time costs while providing competitive quality measure gains with respect to the contemporary methods for representation learning on dynamic graphs.

Dynamic graph embedding Incremental Learning +2

Graph Energies of Egocentric Networks and Their Correlation with Vertex Centrality Measures

no code implementations1 Sep 2018 Mikołaj Morzy, Tomasz Kajdanowicz

We show that when graph energies are applied to local egocentric networks, the values of these energies correlate strongly with vertex centrality measures.

Social and Information Networks Physics and Society

Method for Aspect-Based Sentiment Annotation Using Rhetorical Analysis

no code implementations13 Sep 2017 Łukasz Augustyniak, Krzysztof Rajda, Tomasz Kajdanowicz

This paper fills a gap in aspect-based sentiment analysis and aims to present a new method for preparing and analysing texts concerning opinion and generating user-friendly descriptive reports in natural language.

Aspect-Based Sentiment Analysis Aspect-Based Sentiment Analysis (ABSA) +1

A Network Perspective on Stratification of Multi-Label Data

no code implementations27 Apr 2017 Piotr Szymański, Tomasz Kajdanowicz

We present a new approach to stratifying multi-label data for classification purposes based on the iterative stratification approach proposed by Sechidis et.

Classification Community Detection +2

Is a Data-Driven Approach still Better than Random Choice with Naive Bayes classifiers?

no code implementations13 Feb 2017 Piotr Szymański, Tomasz Kajdanowicz

In case of F1 scores and Subset Accuracy - data driven approaches were more likely to perform better than random approaches than otherwise in the worst case.

General Classification Multi-Label Classification

A scikit-based Python environment for performing multi-label classification

2 code implementations5 Feb 2017 Piotr Szymański, Tomasz Kajdanowicz

It provides native Python implementations of popular multi-label classification methods alongside a novel framework for label space partitioning and division.

General Classification Management +1

WordNet2Vec: Corpora Agnostic Word Vectorization Method

no code implementations10 Jun 2016 Roman Bartusiak, Łukasz Augustyniak, Tomasz Kajdanowicz, Przemysław Kazienko, Maciej Piasecki

Since WordNet embeds natural language in the form of a complex network, a transformation mechanism WordNet2Vec is proposed in the paper.

Clustering General Classification +3

How is a data-driven approach better than random choice in label space division for multi-label classification?

no code implementations7 Jun 2016 Piotr Szymański, Tomasz Kajdanowicz, Kristian Kersting

We show that fastgreedy and walktrap community detection methods on weighted label co-occurence graphs are 85-92% more likely to yield better F1 scores than random partitioning.

Community Detection General Classification +1

Learning in Unlabeled Networks - An Active Learning and Inference Approach

no code implementations5 Oct 2015 Tomasz Kajdanowicz, Radosław Michalski, Katarzyna Musiał, Przemysław Kazienko

The question that arises is: "labels of which nodes should be collected and used for learning in order to provide the best classification accuracy for the whole network?".

Active Learning Classification +2

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