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	---
	language: Chinese
	datasets: CLUECorpusSmall
	widget:
	- text: "作为电子extra0的平台，京东绝对是领先者。如今的刘强extra1已经是身价过extra2的老板。"


	---


	# Chinese T5 Version 1.1

	## Model description

	This is the set of Chinese T5 Version 1.1 models pre-trained by [UER-py](https://github.com/dbiir/UER-py/), which is introduced in [this paper](https://arxiv.org/abs/1909.05658).

	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](https://github.com/dbiir/UER-py/wiki/Modelzoo), or via HuggingFace from the links below:

	\| \| Link \|
	\| ----------------- \| :----------------------------: \|
	\| T5-v1_1-Small \| [L=8/H=512 (Small)][small] \|
	\| T5-v1_1-Base \| [L=12/H=768 (Base)][base] \|

	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):

	```python
	>>> 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](https://github.com/CLUEbenchmark/CLUECorpus2020/) is used as training data.

	## 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 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}
	}
	```

	[small]:https://huggingface.co/uer/t5-v1_1-small-chinese-cluecorpussmall
	[base]:https://huggingface.co/uer/t5-v1_1-base-chinese-cluecorpussmall