This repository contains the official release of the model "BanglaBERT" and associated downstream finetuning code and datasets introduced in the paper titled "BanglaBERT: Combating Embedding Barrier in Multilingual Models for Low-Resource Language Understanding".

Overview

BanglaBERT

This repository contains the official release of the model "BanglaBERT" and associated downstream finetuning code and datasets introduced in the paper titled "BanglaBERT: Combating Embedding Barrier in Multilingual Models for Low-Resource Language Understanding".

Table of Contents

Models

We are releasing a slightly better checkpoint than the one reported in the paper, pretrained with 27.5 GB data, more code switched and code mixed texts, and pretrained further for 2.5M steps. The pretrained model checkpoint is available here. To use this model for the supported downstream tasks in this repository see Training & Evaluation.

Note: This model was pretrained using a specific normalization pipeline available here. All finetuning scripts in this repository uses this normalization by default. If you need to adapt the pretrained model for a different task make sure the text units are normalized using this pipeline before tokenizing to get best results. A basic example is available at the model page.

Datasets

We are also releasing the Bangla Natural Language Inference (NLI) dataset introduced in the paper. The dataset can be found here.

Setup

For installing the necessary requirements, use the following snippet

$ git clone https://https://github.com/csebuetnlp/banglabert
$ cd banglabert/
$ conda create python==3.7.9 pytorch==1.8.1 torchvision==0.9.1 torchaudio==0.8.0 cudatoolkit=10.2 -c pytorch -p ./env
$ conda activate ./env # or source activate ./env (for older versions of anaconda)
$ bash setup.sh 
  • Use the newly created environment for running the scripts in this repository.

Training & Evaluation

To use the pretrained model for finetuning / inference on different downstream tasks see the following section:

  • Sequence Classification.
    • For single sequence classification such as
      • Document classification
      • Sentiment classification
      • Emotion classification etc.
    • For double sequence classification such as
      • Natural Language Inference (NLI)
      • Paraphrase detection etc.
  • Token Classification.
    • For token tagging / classification tasks such as
      • Named Entity Recognition (NER)
      • Parts of Speech Tagging (PoS) etc.

Benchmarks

SC EC DC NER NLI
Metrics Accuracy F1* Accuracy F1 (Entity)* Accuracy
mBERT 83.39 56.02 98.64 67.40 75.40
XLM-R 89.49 66.70 98.71 70.63 76.87
sagorsarker/bangla-bert-base 87.30 61.51 98.79 70.97 70.48
monsoon-nlp/bangla-electra 73.54 34.55 97.64 52.57 63.48
BanglaBERT 92.18 74.27 99.07 72.18 82.94

* - Weighted Average

The benchmarking datasets are as follows:

Acknowledgements

We would like to thank Intelligent Machines and Google TFRC Program for providing cloud support for pretraining the models.

License

Contents of this repository are restricted to non-commercial research purposes only under the Creative Commons Attribution-NonCommercial-ShareAlike 4.0 International License (CC BY-NC-SA 4.0).

Creative Commons License

Citation

If you use any of the datasets, models or code modules, please cite the following paper:

@article{bhattacharjee2021banglabert,
  author    = {Abhik Bhattacharjee and Tahmid Hasan and Kazi Samin and Md Saiful Islam and M. Sohel Rahman and Anindya Iqbal and Rifat Shahriyar},
  title     = {BanglaBERT: Combating Embedding Barrier in Multilingual Models for Low-Resource Language Understanding},
  journal   = {CoRR},
  volume    = {abs/2101.00204},
  year      = {2021},
  url       = {https://arxiv.org/abs/2101.00204},
  eprinttype = {arXiv},
  eprint    = {2101.00204}
}
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