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language: en
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tags:
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- exbert
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license: mit
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datasets:
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Pretrained model on English language using a masked language modeling (MLM) objective. It was introduced in
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[this paper](https://arxiv.org/abs/1907.11692) and first released in
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[this repository](https://github.com/pytorch/fairseq/tree/master/examples/roberta). This model is case-sensitive: it
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makes a difference between english and English.
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Disclaimer: The team releasing RoBERTa did not write a model card for this model so this model card has been written by
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the Hugging Face team.
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## Model description
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RoBERTa is a transformers model pretrained on a large corpus of English data in a self-supervised fashion. This means
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it was pretrained on the raw texts only, with no humans labelling them in any way (which is why it can use lots of
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publicly available data) with an automatic process to generate inputs and labels from those texts.
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More precisely, it was pretrained with the Masked language modeling (MLM) objective. Taking a sentence, the model
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randomly masks 15% of the words in the input then run the entire masked sentence through the model and has to predict
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the masked words. This is different from traditional recurrent neural networks (RNNs) that usually see the words one
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after the other, or from autoregressive models like GPT which internally mask the future tokens. It allows the model to
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learn a bidirectional representation of the sentence.
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This way, the model learns an inner representation of the English language that can then be used to extract features
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useful for downstream tasks: if you have a dataset of labeled sentences for instance, you can train a standard
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classifier using the features produced by the BERT model as inputs.
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## Intended uses & limitations
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You can use the raw model for masked language modeling, but it's mostly intended to be fine-tuned on a downstream task.
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See the [model hub](https://huggingface.co/models?filter=roberta) to look for fine-tuned versions on a task that
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interests you.
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Note that this model is primarily aimed at being fine-tuned on tasks that use the whole sentence (potentially masked)
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to make decisions, such as sequence classification, token classification or question answering. For tasks such as text
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generation you should look at model like GPT2.
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### How to use
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You can use this model directly with a pipeline for masked language modeling:
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```python
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>>> from transformers import pipeline
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>>> unmasker = pipeline('fill-mask', model='roberta-large')
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>>> unmasker("Hello I'm a <mask> model.")
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[{'sequence': "<s>Hello I'm a male model.</s>",
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'score': 0.3317350447177887,
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'token': 2943,
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'token_str': 'Ġmale'},
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{'sequence': "<s>Hello I'm a fashion model.</s>",
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'score': 0.14171843230724335,
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'token': 2734,
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'token_str': 'Ġfashion'},
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{'sequence': "<s>Hello I'm a professional model.</s>",
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'score': 0.04291723668575287,
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'token': 2038,
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'token_str': 'Ġprofessional'},
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{'sequence': "<s>Hello I'm a freelance model.</s>",
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'score': 0.02134818211197853,
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'token': 18150,
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'token_str': 'Ġfreelance'},
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{'sequence': "<s>Hello I'm a young model.</s>",
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'score': 0.021098261699080467,
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'token': 664,
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'token_str': 'Ġyoung'}]
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```
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Here is how to use this model to get the features of a given text in PyTorch:
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```python
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from transformers import RobertaTokenizer, RobertaModel
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tokenizer = RobertaTokenizer.from_pretrained('roberta-large')
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model = RobertaModel.from_pretrained('roberta-large')
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text = "Replace me by any text you'd like."
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encoded_input = tokenizer(text, return_tensors='pt')
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output = model(**encoded_input)
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```
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and in TensorFlow:
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```python
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from transformers import RobertaTokenizer, TFRobertaModel
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tokenizer = RobertaTokenizer.from_pretrained('roberta-large')
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model = TFRobertaModel.from_pretrained('roberta-large')
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text = "Replace me by any text you'd like."
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encoded_input = tokenizer(text, return_tensors='tf')
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output = model(encoded_input)
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```
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### Limitations and bias
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The training data used for this model contains a lot of unfiltered content from the internet, which is far from
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neutral. Therefore, the model can have biased predictions:
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```python
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>>> from transformers import pipeline
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>>> unmasker = pipeline('fill-mask', model='roberta-large')
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>>> unmasker("The man worked as a <mask>.")
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[{'sequence': '<s>The man worked as a mechanic.</s>',
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'score': 0.08260300755500793,
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'token': 25682,
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'token_str': 'Ġmechanic'},
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{'sequence': '<s>The man worked as a driver.</s>',
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'score': 0.05736079439520836,
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'token': 1393,
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'token_str': 'Ġdriver'},
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{'sequence': '<s>The man worked as a teacher.</s>',
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'score': 0.04709019884467125,
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'token': 3254,
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'token_str': 'Ġteacher'},
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{'sequence': '<s>The man worked as a bartender.</s>',
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'score': 0.04641604796051979,
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'token': 33080,
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'token_str': 'Ġbartender'},
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{'sequence': '<s>The man worked as a waiter.</s>',
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'score': 0.04239227622747421,
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'token': 38233,
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'token_str': 'Ġwaiter'}]
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>>> unmasker("The woman worked as a <mask>.")
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[{'sequence': '<s>The woman worked as a nurse.</s>',
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'score': 0.2667474150657654,
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'token': 9008,
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'token_str': 'Ġnurse'},
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{'sequence': '<s>The woman worked as a waitress.</s>',
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'score': 0.12280137836933136,
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'token': 35698,
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'token_str': 'Ġwaitress'},
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{'sequence': '<s>The woman worked as a teacher.</s>',
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'score': 0.09747499972581863,
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'token': 3254,
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'token_str': 'Ġteacher'},
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{'sequence': '<s>The woman worked as a secretary.</s>',
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'score': 0.05783602222800255,
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'token': 2971,
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'token_str': 'Ġsecretary'},
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{'sequence': '<s>The woman worked as a cleaner.</s>',
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'score': 0.05576248839497566,
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'token': 16126,
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'token_str': 'Ġcleaner'}]
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```
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This bias will also affect all fine-tuned versions of this model.
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## Training data
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The RoBERTa model was pretrained on the reunion of five datasets:
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- [BookCorpus](https://yknzhu.wixsite.com/mbweb), a dataset consisting of 11,038 unpublished books;
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- [English Wikipedia](https://en.wikipedia.org/wiki/English_Wikipedia) (excluding lists, tables and headers) ;
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- [CC-News](https://commoncrawl.org/2016/10/news-dataset-available/), a dataset containing 63 millions English news
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articles crawled between September 2016 and February 2019.
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- [OpenWebText](https://github.com/jcpeterson/openwebtext), an opensource recreation of the WebText dataset used to
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train GPT-2,
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- [Stories](https://arxiv.org/abs/1806.02847) a dataset containing a subset of CommonCrawl data filtered to match the
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story-like style of Winograd schemas.
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Together theses datasets weight 160GB of text.
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## Training procedure
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### Preprocessing
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The texts are tokenized using a byte version of Byte-Pair Encoding (BPE) and a vocabulary size of 50,000. The inputs of
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the model take pieces of 512 contiguous token that may span over documents. The beginning of a new document is marked
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with `<s>` and the end of one by `</s>`
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The details of the masking procedure for each sentence are the following:
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- 15% of the tokens are masked.
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- In 80% of the cases, the masked tokens are replaced by `<mask>`.
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- In 10% of the cases, the masked tokens are replaced by a random token (different) from the one they replace.
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- In the 10% remaining cases, the masked tokens are left as is.
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Contrary to BERT, the masking is done dynamically during pretraining (e.g., it changes at each epoch and is not fixed).
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### Pretraining
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The model was trained on 1024 V100 GPUs for 500K steps with a batch size of 8K and a sequence length of 512. The
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optimizer used is Adam with a learning rate of 4e-4, \\(\beta_{1} = 0.9\\), \\(\beta_{2} = 0.98\\) and
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\\(\epsilon = 1e-6\\), a weight decay of 0.01, learning rate warmup for 30,000 steps and linear decay of the learning
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rate after.
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## Evaluation results
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When fine-tuned on downstream tasks, this model achieves the following results:
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Glue test results:
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| Task | MNLI | QQP | QNLI | SST-2 | CoLA | STS-B | MRPC | RTE |
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|:----:|:----:|:----:|:----:|:-----:|:----:|:-----:|:----:|:----:|
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| | 90.2 | 92.2 | 94.7 | 96.4 | 68.0 | 96.4 | 90.9 | 86.6 |
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### BibTeX entry and citation info
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```bibtex
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@article{DBLP:journals/corr/abs-1907-11692,
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author = {Yinhan Liu and
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Myle Ott and
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Naman Goyal and
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Jingfei Du and
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Mandar Joshi and
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Danqi Chen and
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Omer Levy and
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Mike Lewis and
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Luke Zettlemoyer and
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Veselin Stoyanov},
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title = {RoBERTa: {A} Robustly Optimized {BERT} Pretraining Approach},
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journal = {CoRR},
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volume = {abs/1907.11692},
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year = {2019},
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url = {http://arxiv.org/abs/1907.11692},
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archivePrefix = {arXiv},
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eprint = {1907.11692},
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timestamp = {Thu, 01 Aug 2019 08:59:33 +0200},
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biburl = {https://dblp.org/rec/journals/corr/abs-1907-11692.bib},
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bibsource = {dblp computer science bibliography, https://dblp.org}
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}
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```
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<a href="https://huggingface.co/exbert/?model=roberta-base">
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<img width="300px" src="https://cdn-media.huggingface.co/exbert/button.png">
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</a>
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---
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datasets:
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- squad
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widget:
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- text: "Which name is also used to describe the Amazon rainforest in English?"
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context: "The Amazon rainforest (Portuguese: Floresta Amazônica or Amazônia; Spanish: Selva Amazónica, Amazonía or usually Amazonia; French: Forêt amazonienne; Dutch: Amazoneregenwoud), also known in English as Amazonia or the Amazon Jungle, is a moist broadleaf forest that covers most of the Amazon basin of South America. This basin encompasses 7,000,000 square kilometres (2,700,000 sq mi), of which 5,500,000 square kilometres (2,100,000 sq mi) are covered by the rainforest. This region includes territory belonging to nine nations. The majority of the forest is contained within Brazil, with 60% of the rainforest, followed by Peru with 13%, Colombia with 10%, and with minor amounts in Venezuela, Ecuador, Bolivia, Guyana, Suriname and French Guiana. States or departments in four nations contain \"Amazonas\" in their names. The Amazon represents over half of the planet's remaining rainforests, and comprises the largest and most biodiverse tract of tropical rainforest in the world, with an estimated 390 billion individual trees divided into 16,000 species."
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- text: "How many square kilometers of rainforest is covered in the basin?"
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context: "The Amazon rainforest (Portuguese: Floresta Amazônica or Amazônia; Spanish: Selva Amazónica, Amazonía or usually Amazonia; French: Forêt amazonienne; Dutch: Amazoneregenwoud), also known in English as Amazonia or the Amazon Jungle, is a moist broadleaf forest that covers most of the Amazon basin of South America. This basin encompasses 7,000,000 square kilometres (2,700,000 sq mi), of which 5,500,000 square kilometres (2,100,000 sq mi) are covered by the rainforest. This region includes territory belonging to nine nations. The majority of the forest is contained within Brazil, with 60% of the rainforest, followed by Peru with 13%, Colombia with 10%, and with minor amounts in Venezuela, Ecuador, Bolivia, Guyana, Suriname and French Guiana. States or departments in four nations contain \"Amazonas\" in their names. The Amazon represents over half of the planet's remaining rainforests, and comprises the largest and most biodiverse tract of tropical rainforest in the world, with an estimated 390 billion individual trees divided into 16,000 species."
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