readme: ---
  language: zh
  widget: 
  - text: "[CLS]当是时"
  
  
  ---
  
  
  # Chinese Ancient GPT2 Model
  
  ## Model description
  
  The model is used to generate ancient Chinese. You can download the model either from the [GPT2-Chinese Github page](https://github.com/Morizeyao/GPT2-Chinese), or via HuggingFace from the link [gpt2-chinese-ancient](https://huggingface.co/uer/gpt2-chinese-ancient)
  
  ## How to use
  
  You can use the model directly with a pipeline for text generation:
  
  ```python
  >>> from transformers import BertTokenizer, GPT2LMHeadModel, TextGenerationPipeline
  >>> tokenizer = BertTokenizer.from_pretrained("uer/gpt2-chinese-ancient")
  >>> model = GPT2LMHeadModel.from_pretrained("uer/gpt2-chinese-ancient")
  >>> text_generator = TextGenerationPipeline(model, tokenizer)   
  >>> text_generator("当是时", max_length=100, do_sample=True)
      [{'generated_text': '[CLS]当是时 所 议 者 不 为 无 据 ， 况 亦 在 之 列 乎 ？ 然 则 今 日 之 事 ， 所 当 思 者 在 何 ？ 欲 求 国 是 于 天 下 ， 莫 在 于 得 人 。 臣 以 为 求 人 之 法 ， 不 在 多 用 官 一 途 。 诚 使 得 才 者 众 ， 人 才 者 优 ， 则 治 所 当 得 ， 而 不 事 于 官 者 ， 人 才 乃 其 常 也 。 所 当 讲 者'}]
  ```
  
  ## Training data
  
  Training data contains 3,000,000 ancient Chinese which are collected by [daizhigev20](https://github.com/garychowcmu/daizhigev20). Since part of ancient corpus has no punctuation, we used the [ancient Chinese punctuation system](https://seg.shenshen.wiki) developed by [BNU ICIP lab](http://icip.bnu.edu.cn/).　
  
  
  ## Training procedure
  
  The model is pre-trained by [UER-py](https://github.com/dbiir/UER-py/) on [Tencent Cloud](https://cloud.tencent.com/). We pre-train 500,000 steps with a sequence length of 320. We use extended vocabulary to handle out-of-vocabulary words. The Chinese character that occurs greater than or equal to 100 in ancient Chinese corpus is added to the vocabulary.
  
  ```
  python3 preprocess.py --corpus_path corpora/ancient_chinese.txt \
                        --vocab_path models/google_zh_vocab.txt \
                        --dataset_path ancient_chinese_dataset.pt --processes_num 16 \
                        --seq_length 320 --data_processor lm
  ```
  
  ```
  python3 pretrain.py --dataset_path ancient_chinese_dataset.pt \
                      --vocab_path models/google_zh_vocab.txt \
                      --config_path models/bert_base_config.json \
                      --output_model_path models/ancient_chinese_gpt2_model.bin \
                      --world_size 8 --gpu_ranks 0 1 2 3 4 5 6 7 \
                      --total_steps 500000 --save_checkpoint_steps 100000 --report_steps 10000 \
                      --learning_rate 5e-4 --batch_size 32
  ```
  
  Finally, we convert the pre-trained model into Huggingface's format:
  
  ```
  python3 scripts/convert_gpt2_from_uer_to_huggingface.py --input_model_path ancient_chinese_gpt2_model.bin-500000 \
                                                          --output_model_path pytorch_model.bin \
                                                          --layers_num 12
  ```
  
  ### BibTeX entry and citation info
  
  ```
  @article{radford2019language,
    title={Language Models are Unsupervised Multitask Learners},
    author={Radford, Alec and Wu, Jeff and Child, Rewon and Luan, David and Amodei, Dario and Sutskever, Ilya},
    year={2019}
  }
  
  @article{zhao2019uer,
    title={UER: An Open-Source Toolkit for Pre-training Models},
    author={Zhao, Zhe and Chen, Hui and Zhang, Jinbin and Zhao, Xin and Liu, Tao and Lu, Wei and Chen, Xi and Deng, Haotang and Ju, Qi and Du, Xiaoyong},
    journal={EMNLP-IJCNLP 2019},
    pages={241},
    year={2019}
  }
  ```