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StructBERT: Incorporating Language Structures into Pre-training for Deep Language Understanding

https://arxiv.org/abs/1908.04577

Introduction

We extend BERT to a new model, StructBERT, by incorporating language structures into pre-training. Specifically, we pre-train StructBERT with two auxiliary tasks to make the most of the sequential order of words and sentences, which leverage language structures at the word and sentence levels, respectively.

Pre-trained models

Model Description #params Download
structbert.en.large StructBERT using the BERT-large architecture 340M structbert.en.large
structroberta.en.large StructRoBERTa continue training from RoBERTa 355M Coming soon
structbert.ch.large Chinese StructBERT; BERT-large architecture 330M structbert.ch.large

Results

The results of GLUE & CLUE tasks can be reproduced using the hyperparameters listed in the following "Example usage" section.

structbert.en.large

GLUE benchmark

Model MNLI QNLIv2 QQP SST-2 MRPC
structbert.en.large 86.86% 93.04% 91.67% 93.23% 86.51%

structbert.ch.large

CLUE benchmark

Model CMNLI OCNLI TNEWS AFQMC
structbert.ch.large 84.47% 81.28% 68.67% 76.11%

Example usage

Requirements and Installation

  • PyTorch version >= 1.0.1

  • Install other libraries via

pip install -r requirements.txt
  • For faster training install NVIDIA's apex library

Finetune MNLI

python run_classifier_multi_task.py \
  --task_name MNLI \
  --do_train \
  --do_eval \
  --do_test \
  --amp_type O1 \
  --lr_decay_factor 1 \
  --dropout 0.1 \
  --do_lower_case \
  --detach_index -1 \
  --core_encoder bert \
  --data_dir path_to_glue_data \
  --vocab_file config/vocab.txt \
  --bert_config_file config/large_bert_config.json \
  --init_checkpoint path_to_pretrained_model \
  --max_seq_length 128 \
  --train_batch_size 32 \
  --learning_rate 2e-5 \
  --num_train_epochs 3 \
  --fast_train \
  --gradient_accumulation_steps 1 \
  --output_dir path_to_output_dir

Citation

If you use our work, please cite:

@article{wang2019structbert,
  title={Structbert: Incorporating language structures into pre-training for deep language understanding},
  author={Wang, Wei and Bi, Bin and Yan, Ming and Wu, Chen and Bao, Zuyi and Xia, Jiangnan and Peng, Liwei and Si, Luo},
  journal={arXiv preprint arXiv:1908.04577},
  year={2019}
}