transformer-srl

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transformer-srl

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Reimplementation of a BERT based model (Shi et al, 2019), currently the state-of-the-art for English SRL. This model implements also predicate disambiguation.

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# Semantic Role Lableing with BERT

Semantic Role Labeling based on [AllenNLP implementation](https://demo.allennlp.org/semantic-role-labeling) of [Shi et al, 2019](https://arxiv.org/abs/1904.05255). Can be trained using both PropBank and [VerbAtlas](http://verbatlas.org/) inventories and implements also the predicate disambiguation task, in addition to arguments identification and disambiguation.

## How to use

Install the library

```bash
pip install transformer-srl
```

## Pre-trained model

You can also use a pre-trained model. To use it, first install the correct version of `transformer-srl`:

```bash
pip install transformer-srl==2.4.6
```

then download the pretrained model `srl_bert_base_conll2012.tar.gz` from [here](https://www.dropbox.com/s/4tes6ypf2do0feb/srl_bert_base_conll2012.tar.gz).

| File | Model | Version | F1 Argument | F1 Predicate |
| :---: | :---: | :---: | :---: | :---: |
| srl_bert_base_conll2012.tar.gz | `bert-base-cased` | 2.4.6 | 86.0 | 95.5 |

#### CLI

```bash
echo '{"sentence": "Did Uriah honestly think he could beat the game in under three hours?"}' | \
allennlp predict path/to/srl_bert_base_conll2012.tar.gz - --include-package transformer_srl
```

#### Inside Python Code

```python
from transformer_srl import dataset_readers, models, predictors

predictor = predictors.SrlTransformersPredictor.from_path("path/to/srl_bert_base_conll2012.tar.gz, "transformer_srl")
predictor.predict(
  sentence="Did Uriah honestly think he could beat the game in under three hours?"
)
```

## Infos

- Language Model: BERT
- Dataset: CoNLL 2012

### Results with VerbAtlas

With `bert-base-cased`:
```
# Dev set
- F1 arguments 87.6
- F1 predicates 95.5
# Test set
- F1 arguments x
- F1 predicates x
```

With `bert-base-multilingual-cased`:
```
# Dev set
- F1 arguments 86.2
- F1 predicates 94.2
# Test set
- F1 arguments 86.1
- F1 predicates 94.9
```

### To-Dos

- [x] Works with both PropBank and VerbAtlas (infer inventory from dataset reader)
- [ ] Compatibility with all models from Huggingface's Transformers.
        - Now works only with models that accept 1 as token type id 
- [ ] Predicate identification (without using spacy)

transformer-srl

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