Search Results for author: Ulf Leser

Found 30 papers, 19 papers with code

BEEDS: Large-Scale Biomedical Event Extraction using Distant Supervision and Question Answering

1 code implementation BioNLP (ACL) 2022 Xing David Wang, Ulf Leser, Leon Weber

Automatic extraction of event structures from text is a promising way to extract important facts from the evergrowing amount of biomedical literature.

Event Extraction Knowledge Base Population +1

Biomedical Event Extraction as Multi-turn Question Answering

1 code implementation EMNLP (Louhi) 2020 Xing David Wang, Leon Weber, Ulf Leser

Biomedical event extraction from natural text is a challenging task as it searches for complex and often nested structures describing specific relationships between multiple molecular entities, such as genes, proteins, or cellular components.

Event Extraction Knowledge Base Population +3

Extend, don’t rebuild: Phrasing conditional graph modification as autoregressive sequence labelling

1 code implementation EMNLP 2021 Leon Weber, Jannes Münchmeyer, Samuele Garda, Ulf Leser

Deriving and modifying graphs from natural language text has become a versatile basis technology for information extraction with applications in many subfields, such as semantic parsing or knowledge graph construction.

graph construction Graph Generation +1

HunFlair2 in a cross-corpus evaluation of biomedical named entity recognition and normalization tools

no code implementations19 Feb 2024 Mario Sänger, Samuele Garda, Xing David Wang, Leon Weber-Genzel, Pia Droop, Benedikt Fuchs, Alan Akbik, Ulf Leser

Instead, they are applied in the wild, i. e., on application-dependent text collections different from those used for the tools' training, varying, e. g., in focus, genre, style, and text type.

Cross-corpus named-entity-recognition +1

BELHD: Improving Biomedical Entity Linking with Homonoym Disambiguation

no code implementations10 Jan 2024 Samuele Garda, Ulf Leser

Biomedical entity linking (BEL) is the task of grounding entity mentions to a knowledge base (KB).

Contrastive Learning Entity Linking

Large Language Models to the Rescue: Reducing the Complexity in Scientific Workflow Development Using ChatGPT

no code implementations3 Nov 2023 Mario Sänger, Ninon De Mecquenem, Katarzyna Ewa Lewińska, Vasilis Bountris, Fabian Lehmann, Ulf Leser, Thomas Kosch

Scientific workflow systems are increasingly popular for expressing and executing complex data analysis pipelines over large datasets, as they offer reproducibility, dependability, and scalability of analyses by automatic parallelization on large compute clusters.

Raising the ClaSS of Streaming Time Series Segmentation

1 code implementation31 Oct 2023 Arik Ermshaus, Patrick Schäfer, Ulf Leser

Ubiquitous sensors today emit high frequency streams of numerical measurements that reflect properties of human, animal, industrial, commercial, and natural processes.

Change Point Detection Segmentation +3

BELB: a Biomedical Entity Linking Benchmark

1 code implementation22 Aug 2023 Samuele Garda, Leon Weber-Genzel, Robert Martin, Ulf Leser

Biomedical entity linking (BEL) is the task of grounding entity mentions to a knowledge base.

Entity Linking

Time Series Segmentation Applied to a New Data Set for Mobile Sensing of Human Activities

1 code implementation Data Analytics solutions for Real-LIfe APplications 2023 Arik Ermshaus, Sunita Singh, Ulf Leser

Human activity recognition (HAR) systems implement workflows that automatically detect activities from motion data, captured e. g. by wearable devices such as smartphones.

Change Point Detection Human Activity Recognition +3

Window Size Selection in Unsupervised Time Series Analytics: A Review and Benchmark

2 code implementations Advanced Analytics and Learning on Temporal Data 2023 Arik Ermshaus, Patrick Schäfer, Ulf Leser

We provide, for the first time, a systematic survey and experimental study of 6 TS window size selection (WSS) algorithms on three diverse TSDM tasks, namely anomaly detection, segmentation and motif discovery, using state-of-the art TSDM algorithms and benchmarks.

Anomaly Detection Change Point Detection +4

WEASEL 2.0 -- A Random Dilated Dictionary Transform for Fast, Accurate and Memory Constrained Time Series Classification

1 code implementation24 Jan 2023 Patrick Schäfer, Ulf Leser

Time series classification (TSC) is the task of assigning a time series to one of a set of predefined classes, usually based on a model learned from examples.

Time Series Time Series Analysis +1

ClaSP -- Parameter-free Time Series Segmentation

2 code implementations28 Jul 2022 Arik Ermshaus, Patrick Schäfer, Ulf Leser

Such processes often consist of multiple states, e. g. operating modes of a machine, such that state changes in the observed processes result in changes in the distribution of shape of the measured values.

 Ranked #1 on Change Point Detection on TSSB (Covering metric)

Change Point Detection Segmentation +3

Motiflets -- Simple and Accurate Detection of Motifs in Time Series

1 code implementation8 Jun 2022 Patrick Schäfer, Ulf Leser

Motif discovery (MD) is the task of finding such motifs in a given input series.

EEG Time Series +1

ClaSP - Time Series Segmentation

2 code implementations International Conference on Information & Knowledge Management 2021 Patrick Schäfer, Arik Ermshaus, Ulf Leser

In our experimental evaluation using a benchmark of 98 datasets, we show that ClaSP outperforms the state-of-the-art in terms of accuracy and is also faster than the second best method.

Change Point Detection Segmentation +3

Early Detection of Sexual Predators in Chats

1 code implementation ACL 2021 Matthias Vogt, Ulf Leser, Alan Akbik

We define and study the task of early sexual predator detection (eSPD) in chats, where the goal is to analyze a running chat from its beginning and predict grooming attempts as early and as accurately as possible.

TabSim: A Siamese Neural Network for Accurate Estimation of Table Similarity

no code implementations25 Aug 2020 Maryam Habibi, Johannes Starlinger, Ulf Leser

Tables display information as a two-dimensional matrix, the semantics of which is conveyed by a mixture of structure (rows, columns), headers, caption, and content.

Imputation Semantic Similarity +1

NLProlog: Reasoning with Weak Unification for Question Answering in Natural Language

1 code implementation ACL 2019 Leon Weber, Pasquale Minervini, Jannes Münchmeyer, Ulf Leser, Tim Rocktäschel

In contrast, neural models can cope very well with ambiguity by learning distributed representations of words and their composition from data, but lead to models that are difficult to interpret.

Question Answering Sentence

NLProlog: Reasoning with Weak Unification for Natural Language Question Answering

no code implementations ICLR 2019 Leon Weber, Pasquale Minervini, Ulf Leser, Tim Rocktäschel

Currently, most work in natural language processing focuses on neural networks which learn distributed representations of words and their composition, thereby performing well in the presence of large linguistic variability.

Question Answering Sentence

Identifying Key Sentences for Precision Oncology Using Semi-Supervised Learning

1 code implementation WS 2018 Jurica {\v{S}}eva, Martin Wackerbauer, Ulf Leser

For obtaining a realistic classification model, we propose the use of abstracts summarised in relevant sentences as unlabelled examples through Self-Training.

BIG-bench Machine Learning Transductive Learning

Predictive Performance Modeling for Distributed Computing using Black-Box Monitoring and Machine Learning

no code implementations30 May 2018 Carl Witt, Marc Bux, Wladislaw Gusew, Ulf Leser

In many domains, the previous decade was characterized by increasing data volumes and growing complexity of computational workloads, creating new demands for highly data-parallel computing in distributed systems.

BIG-bench Machine Learning Distributed Computing +1

Cross-lingual Candidate Search for Biomedical Concept Normalization

no code implementations4 May 2018 Roland Roller, Madeleine Kittner, Dirk Weissenborn, Ulf Leser

Biomedical concept normalization links concept mentions in texts to a semantically equivalent concept in a biomedical knowledge base.

Translation

Fast and Accurate Time Series Classification with WEASEL

1 code implementation26 Jan 2017 Patrick Schäfer, Ulf Leser

On the popular UCR benchmark of 85 TS datasets, WEASEL is more accurate than the best current non-ensemble algorithms at orders-of-magnitude lower classification and training times, and it is almost as accurate as ensemble classifiers, whose computational complexity makes them inapplicable even for mid-size datasets.

Classification General Classification +4

SCARE ― The Sentiment Corpus of App Reviews with Fine-grained Annotations in German

no code implementations LREC 2016 Mario S{\"a}nger, Ulf Leser, Steffen Kemmerer, Peter Adolphs, Roman Klinger

This corpus consists of 1, 760 annotated application reviews from the Google Play Store with 2, 487 aspects and 3, 959 subjective phrases.

Sentiment Analysis

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