---
tags:
  - flair
  - entity-mention-linker
---

## biosyn-sapbert-bc5cdr-chemical-no-ab3p

Biomedical Entity Mention Linking for chemical:

- Model: [dmis-lab/biosyn-sapbert-bc5cdr-chemical](https://huggingface.co/dmis-lab/biosyn-sapbert-bc5cdr-chemical)
- Dictionary: [CTD Chemicals](https://ctdbase.org/help/chemDetailHelp.jsp) (See [License](https://ctdbase.org/about/legal.jsp))

NOTE: This model variant does not perform abbreviation resolution via [A3bP](https://github.com/ncbi-nlp/Ab3P)


### Demo: How to use in Flair

Requires:

- **[Flair](https://github.com/flairNLP/flair/)>=0.14.0** (`pip install flair` or `pip install git+https://github.com/flairNLP/flair.git`)

```python
from flair.data import Sentence
from flair.models import Classifier, EntityMentionLinker
from flair.tokenization import SciSpacyTokenizer

sentence = Sentence(
    "The mutation in the ABCD1 gene causes X-linked adrenoleukodystrophy, "
    "a neurodegenerative disease, which is exacerbated by exposure to high "
    "levels of mercury in dolphin populations.",
    use_tokenizer=SciSpacyTokenizer()
)

# load hunflair to detect the entity mentions we want to link.
tagger = Classifier.load("hunflair-chemical")
tagger.predict(sentence)

# load the linker and dictionary
linker = EntityMentionLinker.load("chemical-linker-no-abbres")
linker.predict(sentence)

# print the results for each entity mention:
for span in sentence.get_spans(tagger.label_type):
    for link in span.get_labels(linker.label_type):
      print(f"{span.text} -> {link.value}")
```

As an alternative to downloading the already precomputed model (much storage). You can also build the model
and compute the embeddings for the dataset using:

```python
from flair.models.entity_mention_linking import BioSynEntityPreprocessor
linker = EntityMentionLinker.build("dmis-lab/biosyn-sapbert-bc5cdr-chemical", dictionary_name_or_path="ctd-chemicals", preprocessor=BioSynPreprocessor(), hybrid_search=True)
```

This will reduce the download requirements, at the cost of computation.