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README.md

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+---
+license: apache-2.0
+language: en
+datasets:
+- wikipedia
+- bookcorpus
+tags:
+- bert
+- exbert
+- linkbert
+- feature-extraction
+- fill-mask
+- question-answering
+- text-classification
+- token-classification
+---
+
+## LinkBERT-large
+
+LinkBERT-large model pretrained on English Wikipedia articles along with hyperlink information. It is introduced in the paper [LinkBERT: Pretraining Language Models with Document Links (ACL 2022)](https://arxiv.org/abs/2203.15827). The code and data are available in [this repository](https://github.com/michiyasunaga/LinkBERT).
+
+
+## Model description
+
+LinkBERT is a transformer encoder (BERT-like) model pretrained on a large corpus of documents. It is an improvement of BERT that newly captures **document links** such as hyperlinks and citation links to include knowledge that spans across multiple documents. Specifically, it was pretrained by feeding linked documents into the same language model context, besides a single document.
+
+LinkBERT can be used as a drop-in replacement for BERT. It achieves better performance for general language understanding tasks (e.g. text classification), and is also particularly effective for **knowledge-intensive** tasks (e.g. question answering) and **cross-document** tasks (e.g. reading comprehension, document retrieval).
+
+
+## Intended uses & limitations
+
+The model can be used by fine-tuning on a downstream task, such as question answering, sequence classification, and token classification.
+You can also use the raw model for feature extraction (i.e. obtaining embeddings for input text).
+
+
+### How to use
+
+To use the model to get the features of a given text in PyTorch:
+
+```python
+from transformers import AutoTokenizer, AutoModel
+tokenizer = AutoTokenizer.from_pretrained('michiyasunaga/LinkBERT-large')
+model = AutoModel.from_pretrained('michiyasunaga/LinkBERT-large')
+inputs = tokenizer("Hello, my dog is cute", return_tensors="pt")
+outputs = model(**inputs)
+last_hidden_states = outputs.last_hidden_state
+```
+
+For fine-tuning, you can use [this repository](https://github.com/michiyasunaga/LinkBERT) or follow any other BERT fine-tuning codebases.
+
+
+## Evaluation results
+
+When fine-tuned on downstream tasks, LinkBERT achieves the following results.
+
+**General benchmarks ([MRQA](https://github.com/mrqa/MRQA-Shared-Task-2019) and [GLUE](https://gluebenchmark.com/)):**
+
+|                         | HotpotQA | TriviaQA | SearchQA | NaturalQ | NewsQA   | SQuAD    | GLUE      |
+| ----------------------  | -------- | -------- | -------- | -------- | ------   | -----    | --------  |
+|                         | F1       | F1       | F1       |  F1      | F1       | F1       | Avg score |
+| BERT-base               | 76.0     | 70.3     | 74.2     | 76.5     | 65.7     | 88.7     | 79.2      |
+| **LinkBERT-base**       | **78.2** | **73.9** | **76.8** | **78.3** | **69.3** | **90.1** | **79.6**  |
+| BERT-large              | 78.1     | 73.7     | 78.3     | 79.0     | 70.9     | 91.1     | 80.7      |
+| **LinkBERT-large**      | **80.8** | **78.2** | **80.5** | **81.0** | **72.6** | **92.7** | **81.1**  |
+
+
+## Citation
+
+If you find LinkBERT useful in your project, please cite the following:
+
+```bibtex
+@InProceedings{yasunaga2022linkbert,
+  author =  {Michihiro Yasunaga and Jure Leskovec and Percy Liang},
+  title =   {LinkBERT: Pretraining Language Models with Document Links},
+  year =    {2022},  
+  booktitle = {Association for Computational Linguistics (ACL)},  
+}
+```

config.json

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+{
+  "architectures": [
+    "BertModel"
+  ],
+  "attention_probs_dropout_prob": 0.1,
+  "directionality": "bidi",
+  "gradient_checkpointing": false,
+  "hidden_act": "gelu",
+  "hidden_dropout_prob": 0.1,
+  "hidden_size": 1024,
+  "initializer_range": 0.02,
+  "intermediate_size": 4096,
+  "layer_norm_eps": 1e-12,
+  "max_position_embeddings": 512,
+  "model_type": "bert",
+  "num_attention_heads": 16,
+  "num_hidden_layers": 24,
+  "pad_token_id": 0,
+  "pooler_fc_size": 768,
+  "pooler_num_attention_heads": 12,
+  "pooler_num_fc_layers": 3,
+  "pooler_size_per_head": 128,
+  "pooler_type": "first_token_transform",
+  "position_embedding_type": "absolute",
+  "transformers_version": "4.9.1",
+  "type_vocab_size": 2,
+  "use_cache": true,
+  "vocab_size": 28996
+}

pytorch_model.bin

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special_tokens_map.json

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+{"unk_token": "[UNK]", "sep_token": "[SEP]", "pad_token": "[PAD]", "cls_token": "[CLS]", "mask_token": "[MASK]"}

tokenizer_config.json

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