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CodeT5: Identifier-aware Unified Pre-trained Encoder-Decoder Models for Code Understanding and Generation

This is the official PyTorch implementation for the following EMNLP 2021 paper from Salesforce Research:

Title: CodeT5: Identifier-aware Unified Pre-trained Encoder-Decoder Models for Code Understanding and Generation

Authors: Yue Wang, Weishi Wang , Shafiq Joty, and Steven C.H. Hoi

CodeT5 demo


July 06, 2022

We release two large-sized CodeT5 checkpoints at Hugging Face: Salesforce/codet5-large and Salesforce/codet5-large-ntp-py, which are introduced by the paper: CodeRL: Mastering Code Generation through Pretrained Models and Deep Reinforcement Learning by Hung Le, Yue Wang, Akhilesh Deepak Gotmare, Silvio Savarese, Steven C.H. Hoi.

  • CodeT5-large was pretrained using Masked Span Prediction (MSP) objective on CodeSearchNet and achieve new SOTA results on several CodeXGLUE benchmarks. The finetuned checkpoints are released at here. See Appendix A.1 of the paper for more details.

  • CodeT5-large-ntp-py was first pretrained using Masked Span Prediction (MSP) objective on CodeSearchNet and GCPY (the Python split of Github Code data), followed by another 10 epochs on GCPY using Next Token Prediction (NTP) objective.

CodeT5-large-ntp-py is especially optimized for Python code generation tasks and employed as the foundation model for our CodeRL, yielding new SOTA results on the APPS Python competition-level program synthesis benchmark. See the paper for more details.

Oct 29, 2021

We release fine-tuned checkpoints for all the downstream tasks covered in the paper.

Oct 25, 2021

We release a CodeT5-base fine-tuned checkpoint (Salesforce/codet5-base-multi-sum) for multilingual code summarzation. Below is how to use this model:

from transformers import RobertaTokenizer, T5ForConditionalGeneration

if __name__ == '__main__':
    tokenizer = RobertaTokenizer.from_pretrained('Salesforce/codet5-base')
    model = T5ForConditionalGeneration.from_pretrained('Salesforce/codet5-base-multi-sum')

    text = """def svg_to_image(string, size=None):
    if isinstance(string, unicode):
        string = string.encode('utf-8')
        renderer = QtSvg.QSvgRenderer(QtCore.QByteArray(string))
    if not renderer.isValid():
        raise ValueError('Invalid SVG data.')
    if size is None:
        size = renderer.defaultSize()
        image = QtGui.QImage(size, QtGui.QImage.Format_ARGB32)
        painter = QtGui.QPainter(image)
    return image"""

    input_ids = tokenizer(text, return_tensors="pt").input_ids

    generated_ids = model.generate(input_ids, max_length=20)
    print(tokenizer.decode(generated_ids[0], skip_special_tokens=True))
    # this prints: "Convert a SVG string to a QImage."

Oct 18, 2021

We add a model card for CodeT5! Please reach out if you have any questions about it.

Sep 24, 2021

CodeT5 is now in hugginface!

You can simply load the model (CodeT5-small and CodeT5-base) and do the inference:

from transformers import RobertaTokenizer, T5ForConditionalGeneration

tokenizer = RobertaTokenizer.from_pretrained('Salesforce/codet5-base')
model = T5ForConditionalGeneration.from_pretrained('Salesforce/codet5-base')

text = "def greet(user): print(f'hello <extra_id_0>!')"
input_ids = tokenizer(text, return_tensors="pt").input_ids

# simply generate one code span
generated_ids = model.generate(input_ids, max_length=8)
print(tokenizer.decode(generated_ids[0], skip_special_tokens=True))
# this prints "{user.username}"


This repo provides the code for reproducing the experiments in CodeT5: Identifier-aware Unified Pre-trained Encoder-Decoder Models for Code Understanding and Generation . CodeT5 is a new pre-trained encoder-decoder model for programming languages, which is pre-trained on 8.35M functions in 8 programming languages (Python, Java, JavaScript, PHP, Ruby, Go, C, and C#). In total, it achieves state-of-the-art results on 14 sub-tasks in a code intelligence benchmark - CodeXGLUE.

Paper link: https://arxiv.org/abs/2109.00859

Blog link: https://blog.salesforceairesearch.com/codet5/

The code currently includes two pre-trained checkpoints (CodeT5-small and CodeT5-base) and scripts to fine-tune them on 4 generation tasks ( code summarization, code generation, translation, and refinement) plus 2 understanding tasks (code defect detection and clone detection) in CodeXGLUE. We also provide their fine-tuned checkpoints to facilitate the easy replication of our paper.

In practice, CodeT5 can be deployed as an AI-powered coding assistant to boost the productivity of software developers. At Salesforce, we build an AI coding assistant demo using CodeT5 as a VS Code plugin to provide three capabilities for Apex developers:

  • Text-to-code generation: generate code based on the natural language description.
  • Code autocompletion: complete the whole function of code given the target function name.
  • Code summarization: generate the summary of a function in natural language description.

Table of Contents

  1. Citation
  2. License
  3. Dependency
  4. Download
  5. Fine-tuning
  6. Get Involved


If you find this code to be useful for your research, please consider citing:

    title={CodeT5: Identifier-aware Unified Pre-trained Encoder-Decoder Models for Code Understanding and Generation}, 
    author={Yue Wang, Weishi Wang, Shafiq Joty, Steven C.H. Hoi},
    booktitle={Proceedings of the 2021 Conference on Empirical Methods in Natural Language Processing, EMNLP 2021},

  title={CodeRL: Mastering Code Generation through Pretrained Models and Deep Reinforcement Learning},
  author={Le, Hung and Wang, Yue and Gotmare, Akhilesh Deepak and Savarese, Silvio and Hoi, Steven C. H.},
  journal={arXiv preprint arXiv:2207.01780},


The code is released under the BSD-3 License (see LICENSE.txt for details), but we also ask that users respect the following:

This software should not be used to promote or profit from:

violence, hate, and division,

environmental destruction,

abuse of human rights, or

the destruction of people's physical and mental health.

We encourage users of this software to tell us about the applications in which they are putting it to use by emailing codeT5@salesforce.com, and to use appropriate documentation when developing high-stakes applications of this model.


  • Pytorch 1.7.1
  • tensorboard 2.4.1
  • transformers 4.6.1
  • tree-sitter 0.2.2


Instructions to download:

# pip install gsutil
cd your-cloned-codet5-path

gsutil -m cp -r "gs://sfr-codet5-data-research/pretrained_models" .
gsutil -m cp -r "gs://sfr-codet5-data-research/data" .
gsutil -m cp -r "gs://sfr-codet5-data-research/finetuned_models" .


Go to sh folder, set the WORKDIR in exp_with_args.sh to be your cloned CodeT5 repository path.

You can use run_exp.py to run a broad set of experiments by simply passing the model_tag, task, and sub_task arguments. In total, we support five models (i.e., ['roberta', 'codebert', 'bart_base', 'codet5_small', 'codet5_base']) and six tasks (i.e., ['summarize', 'concode', 'translate', 'refine', 'defect', 'clone']). For each task, we use the sub_task to specify which specific datasets to fine-tne on. Below is the full list:

--task --sub_task Description
summarize ruby/javascript/go/python/java/php code summarization task on CodeSearchNet data with six PLs
concode none text-to-code generation on Concode data
translate java-cs/cs-java code-to-code translation between Java and C#
refine small/medium code refinement on code repair data with small/medium functions
defect none code defect detection in C/C++ data
clone none code clone detection in Java data

For example, if you want to run CodeT5-base model on the code summarization task for Python, you can simply run:

python run_exp.py --model_tag codet5_base --task summarize --sub_task python

For multi-task training, you can type:

python run_exp.py --model_tag codet5_base --task multi_task --sub_task none

Besides, you can specify:

model_dir: where to save fine-tuning checkpoints
res_dir: where to save the performance results 
summary_dir: where to save the training curves
data_num: how many data instances to use, the default -1 is for using the full data
gpu: the index of the GPU to use in the cluster

You can also revise the suggested arguments here or directly customize the exp_with_args.sh bash file. Please refer to the argument flags in configs.py for the full available options. The saved training curves in summary_dir can be visualized using tensorboard. Note that we employ one A100 GPU for all fine-tuning experiments.

How to reproduce the results using the released finetuned checkpoints?

  • Remove the --do_train --do_eval --do_eval_bleu and reserve only --do_test at here.
  • Pass the path of your downloaded finetuned checkpoint to load at here, e.g., file = "CodeT5/finetuned_models/summarize_python_codet5_base.bin"
  • Run the program: python run_exp.py --model_tag codet5_base --task summarize --sub_task python

How to fine-tune on your own task and dataset?

If you want to fine-tune on your dataset, you can add your own task and sub_task in configs.py (here) and add your data path and the function to read in utils.py (here and here). The read function can be implemented in _utils.py similar to this one. If your task to add is a generation task, you can simply reuse or customize the run_gen.py. For understanding tasks, please refer to run_defect.py and run_clone.py.

Get Involved

Please create a GitHub issue if you have any questions, suggestions, requests or bug-reports. We welcome PRs!

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