---
license: apache-2.0
language:
- de
tags:
- entity-linking
- wikidata
- umls
---

SapBERT-DE is a model for German biomedical entity linking which is obtained by fine-tuning multilingual entity linking model [`cambridgeltl/SapBERT-UMLS-2020AB-all-lang-from-XLMR`](https://huggingface.co/cambridgeltl/SapBERT-UMLS-2020AB-all-lang-from-XLMR) using a German biomedical entity linking knowledge base named [UMLS-Wikidata](https://zenodo.org/records/11003203).


# Usage
```python
import numpy as np
from tqdm import tqdm
import torch
from transformers import AutoTokenizer, AutoModel  

tokenizer = AutoTokenizer.from_pretrained("permediq/SapBERT-DE", use_fast=True)  
model = AutoModel.from_pretrained("permediq/SapBERT-DE").cuda()

# entity descriptions to embed
entity_descriptions = ["Cerebellum", "Zerebellum", "Kleinhirn", "Anaesthesie"]

bs = 32 # batch size 
all_embs = []
for i in tqdm(np.arange(0, len(entity_descriptions), bs)):
    toks = tokenizer.batch_encode_plus(entity_descriptions[i:i+bs], 
                                       padding="max_length", 
                                       max_length=40, # model trained with 40 max_length 
                                       truncation=True,
                                       return_tensors="pt")
    toks_cuda = {}
    for k,v in toks.items():
        toks_cuda[k] = v.cuda()
    cls_rep = model(**toks_cuda)[0][:,0,:] 
    all_embs.append(cls_rep.cpu().detach())

all_embs = torch.cat(all_embs)

def cos_sim(a, b):
    a_norm = torch.nn.functional.normalize(a, p=2, dim=1)
    b_norm = torch.nn.functional.normalize(b, p=2, dim=1)
    return torch.mm(a_norm, b_norm.transpose(0, 1))

# cosine similarity of first entity with all the entities
print(cos_sim(all_embs[0].unsqueeze(0), all_embs))

# >>> tensor([[1.0000, 0.9337, 0.6206, 0.2086]])
```