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adding model

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+ ---
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+ language: en
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+ tags:
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+ - exbert
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+
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+ license: mit
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+ ---
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+
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+
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+ # GPT-2
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+
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+ Test the whole generation capabilities here: https://transformer.huggingface.co/doc/gpt2-large
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+
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+ Pretrained model on English language using a causal language modeling (CLM) objective. It was introduced in
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+ [this paper](https://d4mucfpksywv.cloudfront.net/better-language-models/language_models_are_unsupervised_multitask_learners.pdf)
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+ and first released at [this page](https://openai.com/blog/better-language-models/).
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+
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+ Disclaimer: The team releasing GPT-2 also wrote a
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+ [model card](https://github.com/openai/gpt-2/blob/master/model_card.md) for their model. Content from this model card
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+ has been written by the Hugging Face team to complete the information they provided and give specific examples of bias.
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+
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+ ## Model description
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+
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+ GPT-2 is a transformers model pretrained on a very large corpus of English data in a self-supervised fashion. This
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+ means it was pretrained on the raw texts only, with no humans labelling them in any way (which is why it can use lots
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+ of publicly available data) with an automatic process to generate inputs and labels from those texts. More precisely,
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+ it was trained to guess the next word in sentences.
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+
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+ More precisely, inputs are sequences of continuous text of a certain length and the targets are the same sequence,
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+ shifted one token (word or piece of word) to the right. The model uses internally a mask-mechanism to make sure the
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+ predictions for the token `i` only uses the inputs from `1` to `i` but not the future tokens.
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+
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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. The model is best at what it was pretrained for however, which is generating texts from a
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+ prompt.
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+
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+ This is the **smallest** version of GPT-2, with 124M parameters.
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+
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+ **Related Models:** [GPT-Large](https://huggingface.co/gpt2-large), [GPT-Medium](https://huggingface.co/gpt2-medium) and [GPT-XL](https://huggingface.co/gpt2-xl)
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+
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+ ## Intended uses & limitations
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+
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+ You can use the raw model for text generation or fine-tune it to a downstream task. See the
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+ [model hub](https://huggingface.co/models?filter=gpt2) to look for fine-tuned versions on a task that interests you.
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+
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+ ### How to use
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+
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+ You can use this model directly with a pipeline for text generation. Since the generation relies on some randomness, we
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+ set a seed for reproducibility:
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+
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+ ```python
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+ >>> from transformers import pipeline, set_seed
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+ >>> generator = pipeline('text-generation', model='gpt2')
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+ >>> set_seed(42)
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+ >>> generator("Hello, I'm a language model,", max_length=30, num_return_sequences=5)
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+
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+ [{'generated_text': "Hello, I'm a language model, a language for thinking, a language for expressing thoughts."},
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+ {'generated_text': "Hello, I'm a language model, a compiler, a compiler library, I just want to know how I build this kind of stuff. I don"},
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+ {'generated_text': "Hello, I'm a language model, and also have more than a few of your own, but I understand that they're going to need some help"},
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+ {'generated_text': "Hello, I'm a language model, a system model. I want to know my language so that it might be more interesting, more user-friendly"},
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+ {'generated_text': 'Hello, I\'m a language model, not a language model"\n\nThe concept of "no-tricks" comes in handy later with new'}]
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+ ```
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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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+
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+ ```python
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+ from transformers import GPT2Tokenizer, GPT2Model
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+ tokenizer = GPT2Tokenizer.from_pretrained('gpt2')
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+ model = GPT2Model.from_pretrained('gpt2')
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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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+
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+ and in TensorFlow:
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+
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+ ```python
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+ from transformers import GPT2Tokenizer, TFGPT2Model
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+ tokenizer = GPT2Tokenizer.from_pretrained('gpt2')
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+ model = TFGPT2Model.from_pretrained('gpt2')
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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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+
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+ ### Limitations and bias
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+
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+ The training data used for this model has not been released as a dataset one can browse. We know it contains a lot of
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+ unfiltered content from the internet, which is far from neutral. As the openAI team themselves point out in their
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+ [model card](https://github.com/openai/gpt-2/blob/master/model_card.md#out-of-scope-use-cases):
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+
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+ > Because large-scale language models like GPT-2 do not distinguish fact from fiction, we don’t support use-cases
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+ > that require the generated text to be true.
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+ >
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+ > Additionally, language models like GPT-2 reflect the biases inherent to the systems they were trained on, so we do
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+ > not recommend that they be deployed into systems that interact with humans > unless the deployers first carry out a
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+ > study of biases relevant to the intended use-case. We found no statistically significant difference in gender, race,
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+ > and religious bias probes between 774M and 1.5B, implying all versions of GPT-2 should be approached with similar
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+ > levels of caution around use cases that are sensitive to biases around human attributes.
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+
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+ Here's an example of how the model can have biased predictions:
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+
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+ ```python
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+ >>> from transformers import pipeline, set_seed
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+ >>> generator = pipeline('text-generation', model='gpt2')
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+ >>> set_seed(42)
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+ >>> generator("The White man worked as a", max_length=10, num_return_sequences=5)
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+
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+ [{'generated_text': 'The White man worked as a mannequin for'},
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+ {'generated_text': 'The White man worked as a maniser of the'},
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+ {'generated_text': 'The White man worked as a bus conductor by day'},
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+ {'generated_text': 'The White man worked as a plumber at the'},
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+ {'generated_text': 'The White man worked as a journalist. He had'}]
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+
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+ >>> set_seed(42)
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+ >>> generator("The Black man worked as a", max_length=10, num_return_sequences=5)
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+
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+ [{'generated_text': 'The Black man worked as a man at a restaurant'},
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+ {'generated_text': 'The Black man worked as a car salesman in a'},
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+ {'generated_text': 'The Black man worked as a police sergeant at the'},
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+ {'generated_text': 'The Black man worked as a man-eating monster'},
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+ {'generated_text': 'The Black man worked as a slave, and was'}]
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+ ```
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+
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+ This bias will also affect all fine-tuned versions of this model.
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+
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+ ## Training data
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+
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+ The OpenAI team wanted to train this model on a corpus as large as possible. To build it, they scraped all the web
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+ pages from outbound links on Reddit which received at least 3 karma. Note that all Wikipedia pages were removed from
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+ this dataset, so the model was not trained on any part of Wikipedia. The resulting dataset (called WebText) weights
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+ 40GB of texts but has not been publicly released. You can find a list of the top 1,000 domains present in WebText
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+ [here](https://github.com/openai/gpt-2/blob/master/domains.txt).
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+
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+ ## Training procedure
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+
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+ ### Preprocessing
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+
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+ The texts are tokenized using a byte-level version of Byte Pair Encoding (BPE) (for unicode characters) and a
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+ vocabulary size of 50,257. The inputs are sequences of 1024 consecutive tokens.
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+
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+ The larger model was trained on 256 cloud TPU v3 cores. The training duration was not disclosed, nor were the exact
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+ details of training.
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+
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+ ## Evaluation results
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+
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+ The model achieves the following results without any fine-tuning (zero-shot):
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+
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+ | Dataset | LAMBADA | LAMBADA | CBT-CN | CBT-NE | WikiText2 | PTB | enwiki8 | text8 | WikiText103 | 1BW |
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+ |:--------:|:-------:|:-------:|:------:|:------:|:---------:|:------:|:-------:|:------:|:-----------:|:-----:|
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+ | (metric) | (PPL) | (ACC) | (ACC) | (ACC) | (PPL) | (PPL) | (BPB) | (BPC) | (PPL) | (PPL) |
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+ | | 35.13 | 45.99 | 87.65 | 83.4 | 29.41 | 65.85 | 1.16 | 1,17 | 37.50 | 75.20 |
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+
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+
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+ ### BibTeX entry and citation info
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+
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+ ```bibtex
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+ @article{radford2019language,
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+ title={Language Models are Unsupervised Multitask Learners},
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+ author={Radford, Alec and Wu, Jeff and Child, Rewon and Luan, David and Amodei, Dario and Sutskever, Ilya},
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+ year={2019}
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+ }
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+ ```
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+
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+ <a href="https://huggingface.co/exbert/?model=gpt2">
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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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