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---
license: apache-2.0
language: en
---
# BART (large-sized model)
BART model pre-trained on English language. It was introduced in the paper [BART: Denoising Sequence-to-Sequence Pre-training for Natural Language Generation, Translation, and Comprehension](https://arxiv.org/abs/1910.13461) by Lewis et al. and first released in [this repository](https://github.com/pytorch/fairseq/tree/master/examples/bart).
Disclaimer: The team releasing BART did not write a model card for this model so this model card has been written by the Hugging Face team.
## Model description
BART is a transformer encoder-decoder (seq2seq) model with a bidirectional (BERT-like) encoder and an autoregressive (GPT-like) decoder. BART is pre-trained by (1) corrupting text with an arbitrary noising function, and (2) learning a model to reconstruct the original text.
BART is particularly effective when fine-tuned for text generation (e.g. summarization, translation) but also works well for comprehension tasks (e.g. text classification, question answering).
## Intended uses & limitations
You can use the raw model for text infilling. However, the model is mostly meant to be fine-tuned on a supervised dataset. See the [model hub](https://huggingface.co/models?search=bart) to look for fine-tuned versions on a task that interests you.
### How to use
Here is how to use this model in PyTorch:
```python
from transformers import BartTokenizer, BartModel
tokenizer = BartTokenizer.from_pretrained('facebook/bart-large')
model = BartModel.from_pretrained('facebook/bart-large')
inputs = tokenizer("Hello, my dog is cute", return_tensors="pt")
outputs = model(**inputs)
last_hidden_states = outputs.last_hidden_state
```
### BibTeX entry and citation info
```bibtex
@article{DBLP:journals/corr/abs-1910-13461,
author = {Mike Lewis and
Yinhan Liu and
Naman Goyal and
Marjan Ghazvininejad and
Abdelrahman Mohamed and
Omer Levy and
Veselin Stoyanov and
Luke Zettlemoyer},
title = {{BART:} Denoising Sequence-to-Sequence Pre-training for Natural Language
Generation, Translation, and Comprehension},
journal = {CoRR},
volume = {abs/1910.13461},
year = {2019},
url = {http://arxiv.org/abs/1910.13461},
eprinttype = {arXiv},
eprint = {1910.13461},
timestamp = {Thu, 31 Oct 2019 14:02:26 +0100},
biburl = {https://dblp.org/rec/journals/corr/abs-1910-13461.bib},
bibsource = {dblp computer science bibliography, https://dblp.org}
}
```

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{ {
"activation_dropout": 0.1, "_num_labels": 3,
"activation_dropout": 0.0,
"activation_function": "gelu", "activation_function": "gelu",
"add_bias_logits": false,
"add_final_layer_norm": false, "add_final_layer_norm": false,
"architectures": [ "architectures": [
"BartModel" "BartModel",
"BartForMaskedLM",
"BartForSequenceClassification"
], ],
"attention_dropout": 0.1, "attention_dropout": 0.0,
"bos_token_id": 0, "bos_token_id": 0,
"classif_dropout": 0.1, "classif_dropout": 0.0,
"classifier_dropout": 0.0,
"d_model": 1024, "d_model": 1024,
"decoder_attention_heads": 16, "decoder_attention_heads": 16,
"decoder_ffn_dim": 4096, "decoder_ffn_dim": 4096,
@ -17,15 +18,11 @@
"decoder_layers": 12, "decoder_layers": 12,
"decoder_start_token_id": 2, "decoder_start_token_id": 2,
"dropout": 0.1, "dropout": 0.1,
"early_stopping": true,
"encoder_attention_heads": 16, "encoder_attention_heads": 16,
"encoder_ffn_dim": 4096, "encoder_ffn_dim": 4096,
"encoder_layerdrop": 0.0, "encoder_layerdrop": 0.0,
"encoder_layers": 12, "encoder_layers": 12,
"eos_token_id": 2, "eos_token_id": 2,
"forced_eos_token_id": 2,
"forced_bos_token_id": 0,
"gradient_checkpointing": false,
"id2label": { "id2label": {
"0": "LABEL_0", "0": "LABEL_0",
"1": "LABEL_1", "1": "LABEL_1",
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}, },
"max_position_embeddings": 1024, "max_position_embeddings": 1024,
"model_type": "bart", "model_type": "bart",
"no_repeat_ngram_size": 3,
"normalize_before": false, "normalize_before": false,
"num_beams": 4,
"num_hidden_layers": 12, "num_hidden_layers": 12,
"output_past": false,
"pad_token_id": 1, "pad_token_id": 1,
"prefix": " ",
"scale_embedding": false, "scale_embedding": false,
"task_specific_params": { "task_specific_params": {
"summarization": { "summarization": {
"length_penalty": 1.0, "early_stopping": true,
"max_length": 128,
"min_length": 12,
"num_beams": 4
},
"summarization_cnn": {
"length_penalty": 2.0, "length_penalty": 2.0,
"max_length": 142, "max_length": 142,
"min_length": 56, "min_length": 56,
"no_repeat_ngram_size": 3,
"num_beams": 4 "num_beams": 4
},
"summarization_xsum": {
"length_penalty": 1.0,
"max_length": 62,
"min_length": 11,
"num_beams": 6
} }
}, },
"transformers_version": "4.7.0.dev0",
"use_cache": true,
"vocab_size": 50265 "vocab_size": 50265
} }

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