---
license: cc-by-nc-sa-4.0
language:
- de
---

## Model description
This model is a fine-tuned version of the [bert-base-german-cased model by deepset](https://huggingface.co/bert-base-german-cased) to classify toxic German-language user comments. 

## How to use

You can use the model with the following code.

```python
#!pip install transformers

from transformers import AutoModelForSequenceClassification, AutoTokenizer, TextClassificationPipeline

model_path = "ankekat1000/toxic-bert-german"
tokenizer = AutoTokenizer.from_pretrained(model_path)
model = AutoModelForSequenceClassification.from_pretrained(model_path)

pipeline =  TextClassificationPipeline(model=model, tokenizer=tokenizer)
print(pipeline('du bist blöd.'))
```

You can apply the pipeline on a data set.

```python

df['result'] = df['comment_text'].apply(lambda x: pipeline(x[:512])) #Cuts after max. legth of tokens for this model, which is 512 for this model.
# Afterwards, you can make two new columns out of the column "result", one including the label, one including the score.
df['toxic_label'] = df['result'].str[0].str['label']
df['score'] = df['result'].str[0].str['score']
```


## Training

The pre-trained model [bert-base-german-cased model by deepset](https://huggingface.co/bert-base-german-cased) was fine-tuned on a crowd-annotated data set of over 14,000 user comments that has been labeled for toxicity in a binary classification task.

As toxic, we defined comments that are inappropriate in whole or in part. By inappropriate, we mean comments that are rude, insulting, hateful, or otherwise make users feel disrespected.


**Language model:** bert-base-cased   (~ 12GB)  
**Language:** German  
**Labels:** Toxicity (binary classification)  
**Training data:** User comments posted to websites and facebook pages of German news media, user comments posted to online participation platforms (~ 14,000)  
**Labeling procedure:** Crowd annotation  
**Batch size:** 32  
**Epochs:** 4  
**Max. tokens length:** 512  
**Infrastructure**: 1xGPU Quadro RTX 8000  
**Published**: Oct 24th, 2023  

## Evaluation results

**Accuracy:**: 86%  
**Macro avg. f1:**: 75%  



|  Label      | Precision | Recall | F1 | Nr. comments in test set |
| ----------- | ----------- | ----------- | ----------- | ----------- |
| not toxic | 0.94       | 0.94       | 0.91       | 1094       |
| toxic | 0.68       | 0.53        | 0.59        | 274       |