TY  - CONF
A1  - Stoeckel, Manuel
A1  - Hemati, Wahed
A1  - Mehler, Alexander
T1  - When specialization helps: using pooled contextualized embeddings to detect chemical and biomedical entities in Spanish
T2  - Proceedings of The 5th Workshop on BioNLP Open Shared Tasks, Hong Kong
N2  - The recognition of pharmacological substances, compounds and proteins is an essential preliminary work for the recognition of relations between chemicals and other biomedically relevant units. In this paper, we describe an approach to Task 1 of the PharmaCoNER Challenge, which involves the recognition of mentions of chemicals and drugs in Spanish medical texts. We train a state-of-the-art BiLSTM-CRF sequence tagger with stacked Pooled Contextualized Embeddings, word and sub-word embeddings using the open-source framework FLAIR. We present a new corpus composed of articles and papers from Spanish health science journals, termed the Spanish Health Corpus, and use it to train domain-specific embeddings which we incorporate in our model training. We achieve a result of 89.76% F1-score using pre-trained embeddings and are able to improve these results to 90.52% F1-score using specialized embeddings.
Y1  - 2019
UR  - http://publikationen.ub.uni-frankfurt.de/frontdoor/index/index/docId/59352
UR  - https://nbn-resolving.org/urn:nbn:de:hebis:30:3-593524
UR  - https://aclanthology.org/D19-5702/
SP  - 11
EP  - 15
PB  - Association for Computational Linguistics
CY  - [Erscheinungsort nicht ermittelbar]
ER  -