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finBERT

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Financial Sentiment Analysis with BERT

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# FinBERT: Financial Sentiment Analysis with BERT

FinBERT sentiment analysis model is now available on Hugging Face model hub. You can get the model [here](https://huggingface.co/ProsusAI/finbert).

FinBERT is a pre-trained NLP model to analyze sentiment of financial text. It is built by further training
 the [BERT](https://arxiv.org/pdf/1810.04805.pdf) language model in the finance domain, using a large financial corpus and thereby fine-tuning
  it for financial sentiment classification. For the details, please see 
  [FinBERT: Financial Sentiment Analysis with Pre-trained Language Models](https://arxiv.org/pdf/1908.10063.pdf).

**Important Note:** 
FinBERT implementation relies on Hugging Face's `pytorch_pretrained_bert` library and their implementation of BERT for sequence classification tasks. `pytorch_pretrained_bert` is an earlier version of the [`transformers`](https://github.com/huggingface/transformers) library. It is on the top of our priority to migrate the code for FinBERT to `transformers` in the near future.

## Installing
 Install the dependencies by creating the Conda environment `finbert` from the given `environment.yml` file and
 activating it.
```bash
conda env create -f environment.yml
conda activate finbert
```

## Models
FinBERT sentiment analysis model is now available on Hugging Face model hub. You can get the model [here](https://huggingface.co/ProsusAI/finbert).

Or, you can download the models from the links below:
* [Language model trained on TRC2](https://prosus-public.s3-eu-west-1.amazonaws.com/finbert/language-model/pytorch_model.bin)
* [Sentiment analysis model trained on Financial PhraseBank](https://prosus-public.s3-eu-west-1.amazonaws.com/finbert/finbert-sentiment/pytorch_model.bin)

For both of these model, the workflow should be like this:
* Create a directory for the model. For example: `models/sentiment/<model directory name>`
* Download the model and put it into the directory you just created.
* Put a copy of `config.json` in this same directory. 
* Call the model with `.from_pretrained(<model directory name>)`

## Datasets
There are two datasets used for FinBERT. The language model further training is done on a subset of Reuters TRC2 
dataset. This dataset is not public, but researchers can apply for access 
[here](https://trec.nist.gov/data/reuters/reuters.html).

For the sentiment analysis, we used Financial PhraseBank from [Malo et al. (2014)](https://www.researchgate.net/publication/251231107_Good_Debt_or_Bad_Debt_Detecting_Semantic_Orientations_in_Economic_Texts).
 The dataset can be downloaded from this [link](https://www.researchgate.net/profile/Pekka_Malo/publication/251231364_FinancialPhraseBank-v10/data/0c96051eee4fb1d56e000000/FinancialPhraseBank-v10.zip?origin=publication_list).
 If you want to train the model on the same dataset, after downloading it, you should create three files under the 
 `data/sentiment_data` folder as `train.csv`, `validation.csv`, `test.csv`. 
To create these files, do the following steps:
- Download the Financial PhraseBank from the above link.
- Get the path of `Sentences_50Agree.txt` file in the `FinancialPhraseBank-v1.0` zip.
- Run the [datasets script](scripts/datasets.py):
```python scripts/datasets.py --data_path <path to Sentences_50Agree.txt>```

## Training the model
Training is done in `finbert_training.ipynb` notebook. The trained model will
 be saved to `models/classifier_model/finbert-sentiment`. You can find the training parameters in the notebook as follows:
```python
config = Config(   data_dir=cl_data_path,
                   bert_model=bertmodel,
                   num_train_epochs=4.0,
                   model_dir=cl_path,
                   max_seq_length = 64,
                   train_batch_size = 32,
                   learning_rate = 2e-5,
                   output_mode='classification',
                   warm_up_proportion=0.2,
                   local_rank=-1,
                   discriminate=True,
                   gradual_unfreeze=True )
```
The last two parameters `discriminate` and `gradual_unfreeze` determine whether to apply the corresponding technique 
against catastrophic forgetting.

## Getting predictions
We provide a script to quickly get sentiment predictions using FinBERT. Given a .txt file, `predict.py` produces a .csv file including the sentences in the text, corresponding softmax probabilities for three labels, actual prediction and sentiment score (which is calculated with: probability of positive - probability of negative).

Here's an example with the provided example text: `test.txt`. From the command line, simply run:
```bash
python predict.py --text_path test.txt --output_dir output/ --model_path models/classifier_model/finbert-sentiment
```
## Disclaimer
This is not an official Prosus product. It is the outcome of an intern research project in Prosus AI team.
### About Prosus 
Prosus is a global consumer internet group and one of the largest technology investors in the world. Operating and
 investing globally in markets with long-term growth potential, Prosus builds leading consumer internet companies that empower people and enrich communities.
For more information, please visit [www.prosus.com](www.prosus.com).

## Contact information
Please contact Dogu Araci `dogu.araci[at]prosus[dot]com` and Zulkuf Genc `zulkuf.genc[at]prosus[dot]com` about
 any FinBERT related issues and questions.

finBERT

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