Chinese T5 Version 1.1

Model description

This is the set of Chinese T5 Version 1.1 models pre-trained by UER-py , which is introduced in this paper .

Version 1.1

Chinese T5 Version 1.1 includes the following improvements compared to our Chinese T5 model:

• GEGLU activation in feed-forward hidden layer, rather than ReLU
• Dropout was turned off in pre-training
• no parameter sharing between embedding and classifier layer

You can download the set of Chinese T5 Version 1.1 models either from the UER-py Modelzoo page , or via HuggingFace from the links below:

In T5 Version 1.1, spans of the input sequence are masked by so-called sentinel token. Each sentinel token represents a unique mask token for the input sequence and should start with <extra_id_0> , <extra_id_1> , … up to <extra_id_99> . However, <extra_id_xxx> is separated into multiple parts in Huggingface's Hosted inference API. Therefore, we replace <extra_id_xxx> with extraxxx in vocabulary and BertTokenizer regards extraxxx as one sentinel token.

How to use

You can use this model directly with a pipeline for text2text generation (take the case of T5-v1_1-Small):

>>> from transformers import BertTokenizer, MT5ForConditionalGeneration, Text2TextGenerationPipeline
>>> tokenizer = BertTokenizer.from_pretrained("uer/t5-v1_1-small-chinese-cluecorpussmall")
>>> model = MT5ForConditionalGeneration.from_pretrained("uer/t5-v1_1-small-chinese-cluecorpussmall")
>>> text2text_generator = Text2TextGenerationPipeline(model, tokenizer)  
>>> text2text_generator("中国的首都是extra0京", max_length=50, do_sample=False)
    [{'generated_text': 'extra0 北 extra1 extra2 extra3 extra4 extra5'}]

Training data

CLUECorpusSmall is used as training data.

Training procedure

The model is pre-trained by UER-py on Tencent Cloud . We pre-train 1,000,000 steps with a sequence length of 128 and then pre-train 250,000 additional steps with a sequence length of 512. We use the same hyper-parameters on different model sizes.

Taking the case of T5-v1_1-Small

Stage1:

python3 preprocess.py --corpus_path corpora/cluecorpussmall.txt \
                      --vocab_path models/google_zh_with_sentinel_vocab.txt \
                      --dataset_path cluecorpussmall_t5-v1_1_seq128_dataset.pt \
                      --processes_num 32 --seq_length 128 \
                      --dynamic_masking --data_processor t5 

python3 pretrain.py --dataset_path cluecorpussmall_t5-v1_1_seq128_dataset.pt \
                    --vocab_path models/google_zh_with_sentinel_vocab.txt \
                    --config_path models/t5-v1_1/small_config.json \
                    --output_model_path models/cluecorpussmall_t5-v1_1_small_seq128_model.bin \
                    --world_size 8 --gpu_ranks 0 1 2 3 4 5 6 7 \
                    --total_steps 1000000 --save_checkpoint_steps 100000 --report_steps 50000 \
                    --learning_rate 1e-3 --batch_size 64 \
                    --span_masking --span_geo_prob 0.3 --span_max_length 5

Stage2:

python3 preprocess.py --corpus_path corpora/cluecorpussmall.txt \
                      --vocab_path models/google_zh_with_sentinel_vocab.txt \
                      --dataset_path cluecorpussmall_t5-v1_1_seq512_dataset.pt \
                      --processes_num 32 --seq_length 512 \
                      --dynamic_masking --data_processor t5 

python3 pretrain.py --dataset_path cluecorpussmall_t5-v1_1_seq512_dataset.pt \
                    --pretrained_model_path models/cluecorpussmall_t5-v1_1_small_seq128_model.bin-1000000 \
                    --vocab_path models/google_zh_with_sentinel_vocab.txt \
                    --config_path models/t5-v1_1/small_config.json \
                    --output_model_path models/cluecorpussmall_t5-v1_1_small_seq512_model.bin \
                    --world_size 8 --gpu_ranks 0 1 2 3 4 5 6 7 \
                    --total_steps 250000 --save_checkpoint_steps 50000 --report_steps 10000 \
                    --learning_rate 5e-4 --batch_size 16 \
                    --span_masking --span_geo_prob 0.3 --span_max_length 5

Finally, we convert the pre-trained model into Huggingface's format:

python3 scripts/convert_t5_from_uer_to_huggingface.py --input_model_path cluecorpussmall_t5_small_seq512_model.bin-250000 \
                                                      --output_model_path pytorch_model.bin \
                                                      --layers_num 8 \
                                                      --type t5-v1_1

BibTeX entry and citation info

@article{2020t5,
  title   = {Exploring the Limits of Transfer Learning with a Unified Text-to-Text Transformer},
  author  = {Colin Raffel and Noam Shazeer and Adam Roberts and Katherine Lee and Sharan Narang and Michael Matena and Yanqi Zhou and Wei Li and Peter J. Liu},
  journal = {Journal of Machine Learning Research},
  pages   = {1-67},
  year    = {2020}
}

@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}
}