Add readme file
Browse files
README.md
ADDED
|
@@ -0,0 +1,136 @@
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
| 1 |
+
---
|
| 2 |
+
language: fr
|
| 3 |
+
license: apache-2.0
|
| 4 |
+
datasets:
|
| 5 |
+
- wikipedia
|
| 6 |
+
---
|
| 7 |
+
|
| 8 |
+
# frALBERT Base
|
| 9 |
+
|
| 10 |
+
Pretrained model on French language using a masked language modeling (MLM) objective. It was introduced in
|
| 11 |
+
[this paper](https://arxiv.org/abs/1909.11942) and first released in
|
| 12 |
+
[this repository](https://github.com/google-research/albert). This model, as all ALBERT models, is uncased: it does not make a difference
|
| 13 |
+
between french and French.
|
| 14 |
+
|
| 15 |
+
## Model description
|
| 16 |
+
|
| 17 |
+
frALBERT is a transformers model pretrained on 4Go of French Wikipedia in a self-supervised fashion. This means it
|
| 18 |
+
was pretrained on the raw texts only, with no humans labelling them in any way (which is why it can use lots of
|
| 19 |
+
publicly available data) with an automatic process to generate inputs and labels from those texts. More precisely, it
|
| 20 |
+
was pretrained with two objectives:
|
| 21 |
+
|
| 22 |
+
- Masked language modeling (MLM): taking a sentence, the model randomly masks 15% of the words in the input then run
|
| 23 |
+
the entire masked sentence through the model and has to predict the masked words. This is different from traditional
|
| 24 |
+
recurrent neural networks (RNNs) that usually see the words one after the other, or from autoregressive models like
|
| 25 |
+
GPT which internally mask the future tokens. It allows the model to learn a bidirectional representation of the
|
| 26 |
+
sentence.
|
| 27 |
+
- Sentence Ordering Prediction (SOP): frALBERT uses a pretraining loss based on predicting the ordering of two consecutive segments of text.
|
| 28 |
+
|
| 29 |
+
This way, the model learns an inner representation of the English language that can then be used to extract features
|
| 30 |
+
useful for downstream tasks: if you have a dataset of labeled sentences for instance, you can train a standard
|
| 31 |
+
classifier using the features produced by the frALBERT model as inputs.
|
| 32 |
+
|
| 33 |
+
frALBERT is particular in that it shares its layers across its Transformer. Therefore, all layers have the same weights. Using repeating layers results in a small memory footprint, however, the computational cost remains similar to a BERT-like architecture with the same number of hidden layers as it has to iterate through the same number of (repeating) layers.
|
| 34 |
+
|
| 35 |
+
This is the first version of the base model.
|
| 36 |
+
|
| 37 |
+
This model has the following configuration:
|
| 38 |
+
|
| 39 |
+
- 12 repeating layers
|
| 40 |
+
- 128 embedding dimension
|
| 41 |
+
- 768 hidden dimension
|
| 42 |
+
- 12 attention heads
|
| 43 |
+
- 11M parameters
|
| 44 |
+
|
| 45 |
+
## Intended uses & limitations
|
| 46 |
+
|
| 47 |
+
You can use the raw model for either masked language modeling or next sentence prediction, but it's mostly intended to
|
| 48 |
+
be fine-tuned on a downstream task. See the [model hub](https://huggingface.co/models?filter=fralbert) to look for
|
| 49 |
+
fine-tuned versions on a task that interests you.
|
| 50 |
+
|
| 51 |
+
Note that this model is primarily aimed at being fine-tuned on tasks that use the whole sentence (potentially masked)
|
| 52 |
+
to make decisions, such as sequence classification, token classification or question answering. For tasks such as text
|
| 53 |
+
generation you should look at model like GPT2.
|
| 54 |
+
|
| 55 |
+
### How to use
|
| 56 |
+
|
| 57 |
+
You can use this model directly with a pipeline for masked language modeling:
|
| 58 |
+
|
| 59 |
+
```python
|
| 60 |
+
>>> from transformers import pipeline
|
| 61 |
+
>>> unmasker = pipeline('fill-mask', model='fralbert-base')
|
| 62 |
+
>>> unmasker("Bonjour Je suis un model [MASK] .")
|
| 63 |
+
```
|
| 64 |
+
|
| 65 |
+
Here is how to use this model to get the features of a given text in PyTorch:
|
| 66 |
+
|
| 67 |
+
```python
|
| 68 |
+
from transformers import AlbertTokenizer, AlbertModel
|
| 69 |
+
tokenizer = AlbertTokenizer.from_pretrained('fralbert-base')
|
| 70 |
+
model = AlbertModel.from_pretrained("fralbert-base")
|
| 71 |
+
text = "Remplacez-moi par le texte en français que vous souhaitez."
|
| 72 |
+
encoded_input = tokenizer(text, return_tensors='pt')
|
| 73 |
+
output = model(**encoded_input)
|
| 74 |
+
```
|
| 75 |
+
|
| 76 |
+
and in TensorFlow:
|
| 77 |
+
|
| 78 |
+
```python
|
| 79 |
+
from transformers import AlbertTokenizer, TFAlbertModel
|
| 80 |
+
tokenizer = AlbertTokenizer.from_pretrained('fralbert-base')
|
| 81 |
+
model = TFAlbertModel.from_pretrained("fralbert-base")
|
| 82 |
+
text = "Remplacez-moi par le texte en français que vous souhaitez."
|
| 83 |
+
encoded_input = tokenizer(text, return_tensors='tf')
|
| 84 |
+
output = model(encoded_input)
|
| 85 |
+
```
|
| 86 |
+
|
| 87 |
+
|
| 88 |
+
## Training data
|
| 89 |
+
|
| 90 |
+
The frALBERT model was pretrained on 4go of [French Wikipedia](https://fr.wikipedia.org/wiki/French_Wikipedia) (excluding lists, tables and
|
| 91 |
+
headers).
|
| 92 |
+
|
| 93 |
+
## Training procedure
|
| 94 |
+
|
| 95 |
+
### Preprocessing
|
| 96 |
+
|
| 97 |
+
The texts are lowercased and tokenized using SentencePiece and a vocabulary size of 32,000. The inputs of the model are
|
| 98 |
+
then of the form:
|
| 99 |
+
|
| 100 |
+
```
|
| 101 |
+
[CLS] Sentence A [SEP] Sentence B [SEP]
|
| 102 |
+
```
|
| 103 |
+
|
| 104 |
+
### Training
|
| 105 |
+
|
| 106 |
+
The frALBERT procedure follows the BERT setup.
|
| 107 |
+
|
| 108 |
+
The details of the masking procedure for each sentence are the following:
|
| 109 |
+
- 15% of the tokens are masked.
|
| 110 |
+
- In 80% of the cases, the masked tokens are replaced by `[MASK]`.
|
| 111 |
+
- In 10% of the cases, the masked tokens are replaced by a random token (different) from the one they replace.
|
| 112 |
+
- In the 10% remaining cases, the masked tokens are left as is.
|
| 113 |
+
|
| 114 |
+
## Evaluation results
|
| 115 |
+
|
| 116 |
+
When fine-tuned on downstream tasks, the ALBERT models achieve the following results:
|
| 117 |
+
|
| 118 |
+
| | FQuAD1.0 | PIAF_dev
|
| 119 |
+
|----------------|----------|----------
|
| 120 |
+
|frALBERT-base |72.6/55.1 |61.0 / 38.9
|
| 121 |
+
|
| 122 |
+
|
| 123 |
+
### BibTeX entry and citation info
|
| 124 |
+
|
| 125 |
+
```bibtex
|
| 126 |
+
@inproceedings{cattan2021fralbert,
|
| 127 |
+
author = {Oralie Cattan and
|
| 128 |
+
Christophe Servan and
|
| 129 |
+
Sophie Rosset},
|
| 130 |
+
booktitle = {Recent Advances in Natural Language Processing, RANLP 2021},
|
| 131 |
+
title = {{On the Usability of Transformers-based models for a French Question-Answering task}},
|
| 132 |
+
year = {2021},
|
| 133 |
+
address = {Online},
|
| 134 |
+
month = sep,
|
| 135 |
+
}
|
| 136 |
+
```
|