|
--- |
|
language: |
|
- ar |
|
license: apache-2.0 |
|
widget: |
|
- text: "الهدف من الحياة هو [MASK] ." |
|
--- |
|
|
|
# CAMeLBERT: A collection of pre-trained models for Arabic NLP tasks |
|
|
|
## Model description |
|
|
|
**CAMeLBERT** is a collection of BERT models pre-trained on Arabic texts with different sizes and variants. |
|
We release pre-trained language models for Modern Standard Arabic (MSA), dialectal Arabic (DA), and classical Arabic (CA), in addition to a model pre-trained on a mix of the three. |
|
We also provide additional models that are pre-trained on a scaled-down set of the MSA variant (half, quarter, eighth, and sixteenth). |
|
The details are described in the paper *"[The Interplay of Variant, Size, and Task Type in Arabic Pre-trained Language Models](https://arxiv.org/abs/2103.06678)."* |
|
|
|
This model card describes **CAMeLBERT-CA** (`bert-base-arabic-camelbert-ca`), a model pre-trained on the CA (classical Arabic) dataset. |
|
|
|
||Model|Variant|Size|#Word| |
|
|-|-|:-:|-:|-:| |
|
||`bert-base-arabic-camelbert-mix`|CA,DA,MSA|167GB|17.3B| |
|
|✔|`bert-base-arabic-camelbert-ca`|CA|6GB|847M| |
|
||`bert-base-arabic-camelbert-da`|DA|54GB|5.8B| |
|
||`bert-base-arabic-camelbert-msa`|MSA|107GB|12.6B| |
|
||`bert-base-arabic-camelbert-msa-half`|MSA|53GB|6.3B| |
|
||`bert-base-arabic-camelbert-msa-quarter`|MSA|27GB|3.1B| |
|
||`bert-base-arabic-camelbert-msa-eighth`|MSA|14GB|1.6B| |
|
||`bert-base-arabic-camelbert-msa-sixteenth`|MSA|6GB|746M| |
|
|
|
## Intended uses |
|
You can use the released model for either masked language modeling or next sentence prediction. |
|
However, it is mostly intended to be fine-tuned on an NLP task, such as NER, POS tagging, sentiment analysis, dialect identification, and poetry classification. |
|
We release our fine-tuninig code [here](https://github.com/CAMeL-Lab/CAMeLBERT). |
|
|
|
#### How to use |
|
You can use this model directly with a pipeline for masked language modeling: |
|
```python |
|
>>> from transformers import pipeline |
|
>>> unmasker = pipeline('fill-mask', model='CAMeL-Lab/bert-base-arabic-camelbert-ca') |
|
>>> unmasker("الهدف من الحياة هو [MASK] .") |
|
[{'sequence': '[CLS] الهدف من الحياة هو الحياة. [SEP]', |
|
'score': 0.11048116534948349, |
|
'token': 3696, |
|
'token_str': 'الحياة'}, |
|
{'sequence': '[CLS] الهدف من الحياة هو الإسلام. [SEP]', |
|
'score': 0.03481195122003555, |
|
'token': 4677, |
|
'token_str': 'الإسلام'}, |
|
{'sequence': '[CLS] الهدف من الحياة هو الموت. [SEP]', |
|
'score': 0.03402028977870941, |
|
'token': 4295, |
|
'token_str': 'الموت'}, |
|
{'sequence': '[CLS] الهدف من الحياة هو العلم. [SEP]', |
|
'score': 0.027655426412820816, |
|
'token': 2789, |
|
'token_str': 'العلم'}, |
|
{'sequence': '[CLS] الهدف من الحياة هو هذا. [SEP]', |
|
'score': 0.023059621453285217, |
|
'token': 2085, |
|
'token_str': 'هذا'}] |
|
``` |
|
|
|
*Note*: to download our models, you would need `transformers>=3.5.0`. Otherwise, you could download the models manually. |
|
|
|
Here is how to use this model to get the features of a given text in PyTorch: |
|
```python |
|
from transformers import AutoTokenizer, AutoModel |
|
tokenizer = AutoTokenizer.from_pretrained('CAMeL-Lab/bert-base-arabic-camelbert-ca') |
|
model = AutoModel.from_pretrained('CAMeL-Lab/bert-base-arabic-camelbert-ca') |
|
text = "مرحبا يا عالم." |
|
encoded_input = tokenizer(text, return_tensors='pt') |
|
output = model(**encoded_input) |
|
``` |
|
|
|
and in TensorFlow: |
|
```python |
|
from transformers import AutoTokenizer, TFAutoModel |
|
tokenizer = AutoTokenizer.from_pretrained('CAMeL-Lab/bert-base-arabic-camelbert-ca') |
|
model = TFAutoModel.from_pretrained('CAMeL-Lab/bert-base-arabic-camelbert-ca') |
|
text = "مرحبا يا عالم." |
|
encoded_input = tokenizer(text, return_tensors='tf') |
|
output = model(encoded_input) |
|
``` |
|
|
|
## Training data |
|
- CA (classical Arabic) |
|
- [OpenITI (Version 2020.1.2)](https://zenodo.org/record/3891466#.YEX4-F0zbzc) |
|
|
|
## Training procedure |
|
We use [the original implementation](https://github.com/google-research/bert) released by Google for pre-training. |
|
We follow the original English BERT model's hyperparameters for pre-training, unless otherwise specified. |
|
|
|
### Preprocessing |
|
- After extracting the raw text from each corpus, we apply the following pre-processing. |
|
- We first remove invalid characters and normalize white spaces using the utilities provided by [the original BERT implementation](https://github.com/google-research/bert/blob/eedf5716ce1268e56f0a50264a88cafad334ac61/tokenization.py#L286-L297). |
|
- We also remove lines without any Arabic characters. |
|
- We then remove diacritics and kashida using [CAMeL Tools](https://github.com/CAMeL-Lab/camel_tools). |
|
- Finally, we split each line into sentences with a heuristics-based sentence segmenter. |
|
- We train a WordPiece tokenizer on the entire dataset (167 GB text) with a vocabulary size of 30,000 using [HuggingFace's tokenizers](https://github.com/huggingface/tokenizers). |
|
- We do not lowercase letters nor strip accents. |
|
|
|
### Pre-training |
|
- The model was trained on a single cloud TPU (`v3-8`) for one million steps in total. |
|
- The first 90,000 steps were trained with a batch size of 1,024 and the rest was trained with a batch size of 256. |
|
- The sequence length was limited to 128 tokens for 90% of the steps and 512 for the remaining 10%. |
|
- We use whole word masking and a duplicate factor of 10. |
|
- We set max predictions per sequence to 20 for the dataset with max sequence length of 128 tokens and 80 for the dataset with max sequence length of 512 tokens. |
|
- We use a random seed of 12345, masked language model probability of 0.15, and short sequence probability of 0.1. |
|
- The optimizer used is Adam with a learning rate of 1e-4, \\(\beta_{1} = 0.9\\) and \\(\beta_{2} = 0.999\\), a weight decay of 0.01, learning rate warmup for 10,000 steps and linear decay of the learning rate after. |
|
|
|
## Evaluation results |
|
- We evaluate our pre-trained language models on five NLP tasks: NER, POS tagging, sentiment analysis, dialect identification, and poetry classification. |
|
- We fine-tune and evaluate the models using 12 dataset. |
|
- We used Hugging Face's transformers to fine-tune our CAMeLBERT models. |
|
- We used transformers `v3.1.0` along with PyTorch `v1.5.1`. |
|
- The fine-tuning was done by adding a fully connected linear layer to the last hidden state. |
|
- We use \\(F_{1}\\) score as a metric for all tasks. |
|
- Code used for fine-tuning is available [here](https://github.com/CAMeL-Lab/CAMeLBERT). |
|
|
|
### Results |
|
|
|
| Task | Dataset | Variant | Mix | CA | DA | MSA | MSA-1/2 | MSA-1/4 | MSA-1/8 | MSA-1/16 | |
|
| -------------------- | --------------- | ------- | ----- | ----- | ----- | ----- | ------- | ------- | ------- | -------- | |
|
| NER | ANERcorp | MSA | 80.8% | 67.9% | 74.1% | 82.4% | 82.0% | 82.1% | 82.6% | 80.8% | |
|
| POS | PATB (MSA) | MSA | 98.1% | 97.8% | 97.7% | 98.3% | 98.2% | 98.3% | 98.2% | 98.2% | |
|
| | ARZTB (EGY) | DA | 93.6% | 92.3% | 92.7% | 93.6% | 93.6% | 93.7% | 93.6% | 93.6% | |
|
| | Gumar (GLF) | DA | 97.3% | 97.7% | 97.9% | 97.9% | 97.9% | 97.9% | 97.9% | 97.9% | |
|
| SA | ASTD | MSA | 76.3% | 69.4% | 74.6% | 76.9% | 76.0% | 76.8% | 76.7% | 75.3% | |
|
| | ArSAS | MSA | 92.7% | 89.4% | 91.8% | 93.0% | 92.6% | 92.5% | 92.5% | 92.3% | |
|
| | SemEval | MSA | 69.0% | 58.5% | 68.4% | 72.1% | 70.7% | 72.8% | 71.6% | 71.2% | |
|
| DID | MADAR-26 | DA | 62.9% | 61.9% | 61.8% | 62.6% | 62.0% | 62.8% | 62.0% | 62.2% | |
|
| | MADAR-6 | DA | 92.5% | 91.5% | 92.2% | 91.9% | 91.8% | 92.2% | 92.1% | 92.0% | |
|
| | MADAR-Twitter-5 | MSA | 75.7% | 71.4% | 74.2% | 77.6% | 78.5% | 77.3% | 77.7% | 76.2% | |
|
| | NADI | DA | 24.7% | 17.3% | 20.1% | 24.9% | 24.6% | 24.6% | 24.9% | 23.8% | |
|
| Poetry | APCD | CA | 79.8% | 80.9% | 79.6% | 79.7% | 79.9% | 80.0% | 79.7% | 79.8% | |
|
|
|
### Results (Average) |
|
| | Variant | Mix | CA | DA | MSA | MSA-1/2 | MSA-1/4 | MSA-1/8 | MSA-1/16 | |
|
| -------------------- | ------- | ----- | ----- | ----- | ----- | ------- | ------- | ------- | -------- | |
|
| Variant-wise-average<sup>[[1]](#footnote-1)</sup> | MSA | 82.1% | 75.7% | 80.1% | 83.4% | 83.0% | 83.3% | 83.2% | 82.3% | |
|
| | DA | 74.4% | 72.1% | 72.9% | 74.2% | 74.0% | 74.3% | 74.1% | 73.9% | |
|
| | CA | 79.8% | 80.9% | 79.6% | 79.7% | 79.9% | 80.0% | 79.7% | 79.8% | |
|
| Macro-Average | ALL | 78.7% | 74.7% | 77.1% | 79.2% | 79.0% | 79.2% | 79.1% | 78.6% | |
|
|
|
<a name="footnote-1">[1]</a>: Variant-wise-average refers to average over a group of tasks in the same language variant. |
|
|
|
## Acknowledgements |
|
This research was supported with Cloud TPUs from Google’s TensorFlow Research Cloud (TFRC). |
|
|
|
## Citation |
|
|
|
```bibtex |
|
@inproceedings{inoue-etal-2021-interplay, |
|
title = "The Interplay of Variant, Size, and Task Type in {A}rabic Pre-trained Language Models", |
|
author = "Inoue, Go and |
|
Alhafni, Bashar and |
|
Baimukan, Nurpeiis and |
|
Bouamor, Houda and |
|
Habash, Nizar", |
|
booktitle = "Proceedings of the Sixth Arabic Natural Language Processing Workshop", |
|
month = apr, |
|
year = "2021", |
|
address = "Kyiv, Ukraine (Online)", |
|
publisher = "Association for Computational Linguistics", |
|
abstract = "In this paper, we explore the effects of language variants, data sizes, and fine-tuning task types in Arabic pre-trained language models. To do so, we build three pre-trained language models across three variants of Arabic: Modern Standard Arabic (MSA), dialectal Arabic, and classical Arabic, in addition to a fourth language model which is pre-trained on a mix of the three. We also examine the importance of pre-training data size by building additional models that are pre-trained on a scaled-down set of the MSA variant. We compare our different models to each other, as well as to eight publicly available models by fine-tuning them on five NLP tasks spanning 12 datasets. Our results suggest that the variant proximity of pre-training data to fine-tuning data is more important than the pre-training data size. We exploit this insight in defining an optimized system selection model for the studied tasks.", |
|
} |
|
``` |
|
|
