Search Results for author: Alexander Löser

Found 20 papers, 12 papers with code

Attention Networks for Augmenting Clinical Text with Support Sets for Diagnosis Prediction

no code implementations COLING 2022 Paul Grundmann, Tom Oberhauser, Felix Gers, Alexander Löser

Furthermore, we find that support sets drastically improve the performance for pregnancy- and gynecology-related diagnoses up to 32. 9% points compared to the baseline.

LongHealth: A Question Answering Benchmark with Long Clinical Documents

1 code implementation25 Jan 2024 Lisa Adams, Felix Busch, Tianyu Han, Jean-Baptiste Excoffier, Matthieu Ortala, Alexander Löser, Hugo JWL. Aerts, Jakob Nikolas Kather, Daniel Truhn, Keno Bressem

However, all models struggled significantly in tasks requiring the identification of missing information, highlighting a critical area for improvement in clinical data interpretation.

Information Retrieval Multiple-choice +2

MedAlpaca -- An Open-Source Collection of Medical Conversational AI Models and Training Data

no code implementations14 Apr 2023 Tianyu Han, Lisa C. Adams, Jens-Michalis Papaioannou, Paul Grundmann, Tom Oberhauser, Alexander Löser, Daniel Truhn, Keno K. Bressem

As large language models (LLMs) like OpenAI's GPT series continue to make strides, we witness the emergence of artificial intelligence applications in an ever-expanding range of fields.

Cross-Lingual Knowledge Transfer for Clinical Phenotyping

1 code implementation LREC 2022 Jens-Michalis Papaioannou, Paul Grundmann, Betty van Aken, Athanasios Samaras, Ilias Kyparissidis, George Giannakoulas, Felix Gers, Alexander Löser

Clinical phenotyping enables the automatic extraction of clinical conditions from patient records, which can be beneficial to doctors and clinics worldwide.

Transfer Learning

What Do You See in this Patient? Behavioral Testing of Clinical NLP Models

1 code implementation NAACL (ClinicalNLP) 2022 Betty van Aken, Sebastian Herrmann, Alexander Löser

We thus introduce an extendable testing framework that evaluates the behavior of clinical outcome models regarding changes of the input.

KIMERA: Injecting Domain Knowledge into Vacant Transformer Heads

no code implementations LREC 2022 Benjamin Winter, Alexei Figueroa, Alexander Löser, Felix Alexander Gers, Amy Siu

We apply KIMERA to BERT-base to evaluate the extent of the domain transfer and also improve on the already strong results of BioBERT in the clinical domain.

Information Retrieval Model Compression +1

Self-supervised Answer Retrieval on Clinical Notes

no code implementations2 Aug 2021 Paul Grundmann, Sebastian Arnold, Alexander Löser

Retrieving answer passages from long documents is a complex task requiring semantic understanding of both discourse and document context.


VisBERT: Hidden-State Visualizations for Transformers

1 code implementation9 Nov 2020 Betty van Aken, Benjamin Winter, Alexander Löser, Felix A. Gers

At the same time, they are difficult to incorporate into the large, black-box models that achieve state-of-the-art results in a multitude of NLP tasks.

Multi-hop Question Answering Question Answering

Learning Contextualized Document Representations for Healthcare Answer Retrieval

1 code implementation3 Feb 2020 Sebastian Arnold, Betty van Aken, Paul Grundmann, Felix A. Gers, Alexander Löser

Our model leverages a dual encoder architecture with hierarchical LSTM layers and multi-task training to encode the position of clinical entities and aspects alongside the document discourse.

Passage Ranking Retrieval +1

From Symmetry to Asymmetry: Generalizing TSP Approximations by Parametrization

1 code implementation6 Nov 2019 Lukas Behrendt, Katrin Casel, Tobias Friedrich, J. A. Gregor Lagodzinski, Alexander Löser, Marcus Wilhelm

Our generalization of the tree doubling algorithm gives a parameterized 3-approximation, where the parameter is the number of asymmetric edges in a given minimum spanning arborescence.

Data Structures and Algorithms

How Does BERT Answer Questions? A Layer-Wise Analysis of Transformer Representations

2 code implementations11 Sep 2019 Betty van Aken, Benjamin Winter, Alexander Löser, Felix A. Gers

In order to better understand BERT and other Transformer-based models, we present a layer-wise analysis of BERT's hidden states.

Question Answering

SECTOR: A Neural Model for Coherent Topic Segmentation and Classification

3 code implementations TACL 2019 Sebastian Arnold, Rudolf Schneider, Philippe Cudré-Mauroux, Felix A. Gers, Alexander Löser

From our extensive evaluation of 20 architectures, we report a highest score of 71. 6% F1 for the segmentation and classification of 30 topics from the English city domain, scored by our SECTOR LSTM model with bloom filter embeddings and bidirectional segmentation.

Classification General Classification +2

IDEL: In-Database Entity Linking with Neural Embeddings

no code implementations13 Mar 2018 Torsten Kilias, Alexander Löser, Felix A. Gers, Richard Koopmanschap, Ying Zhang, Martin Kersten

We present a novel architecture, In-Database Entity Linking (IDEL), in which we integrate the analytics-optimized RDBMS MonetDB with neural text mining abilities.

Entity Linking Retrieval

Analysing Errors of Open Information Extraction Systems

no code implementations WS 2017 Rudolf Schneider, Tom Oberhauser, Tobias Klatt, Felix A. Gers, Alexander Löser

We report results on benchmarking Open Information Extraction (OIE) systems using RelVis, a toolkit for benchmarking Open Information Extraction systems.

Benchmarking Open Information Extraction

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