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271 lines
8.4 KiB
271 lines
8.4 KiB
# Colossal-AI
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<div id="top" align="center">
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[](https://www.colossalai.org/)
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An integrated large-scale model training system with efficient parallelization techniques.
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<h3> <a href="https://arxiv.org/abs/2110.14883"> Paper </a> |
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<a href="https://www.colossalai.org/"> Documentation </a> |
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<a href="https://github.com/hpcaitech/ColossalAI-Examples"> Examples </a> |
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<a href="https://github.com/hpcaitech/ColossalAI/discussions"> Forum </a> |
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<a href="https://medium.com/@hpcaitech"> Blog </a></h3>
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[](https://github.com/hpcaitech/ColossalAI/actions/workflows/build.yml)
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[](https://colossalai.readthedocs.io/en/latest/?badge=latest)
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[](https://www.codefactor.io/repository/github/hpcaitech/colossalai)
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[](https://huggingface.co/hpcai-tech)
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[](https://join.slack.com/t/colossalaiworkspace/shared_invite/zt-z7b26eeb-CBp7jouvu~r0~lcFzX832w)
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[](https://raw.githubusercontent.com/hpcaitech/public_assets/main/colossalai/img/WeChat.png)
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| [English](README.md) | [中文](README-zh-Hans.md) |
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</div>
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## Table of Contents
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<ul>
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<li><a href="#Features">Features</a> </li>
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<li>
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<a href="#Demo">Demo</a>
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<ul>
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<li><a href="#ViT">ViT</a></li>
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<li><a href="#GPT-3">GPT-3</a></li>
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<li><a href="#GPT-2">GPT-2</a></li>
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<li><a href="#BERT">BERT</a></li>
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</ul>
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</li>
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<li>
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<a href="#Installation">Installation</a>
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<ul>
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<li><a href="#PyPI">PyPI</a></li>
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<li><a href="#Install-From-Source">Install From Source</a></li>
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</ul>
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</li>
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<li><a href="#Use-Docker">Use Docker</a></li>
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<li><a href="#Community">Community</a></li>
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<li><a href="#contributing">Contributing</a></li>
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<li><a href="#Quick-View">Quick View</a></li>
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<ul>
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<li><a href="#Start-Distributed-Training-in-Lines">Start Distributed Training in Lines</a></li>
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<li><a href="#Write-a-Simple-2D-Parallel-Model">Write a Simple 2D Parallel Model</a></li>
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</ul>
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<li><a href="#Cite-Us">Cite Us</a></li>
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</ul>
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## Features
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Colossal-AI provides a collection of parallel training components for you. We aim to support you to write your
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distributed deep learning models just like how you write your single-GPU model. We provide friendly tools to kickstart
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distributed training in a few lines.
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- Data Parallelism
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- Pipeline Parallelism
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- 1D, 2D, 2.5D, 3D tensor parallelism
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- Sequence parallelism
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- Friendly trainer and engine
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- Extensible for new parallelism
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- Mixed Precision Training
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- Zero Redundancy Optimizer (ZeRO)
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<p align="right">(<a href="#top">back to top</a>)</p>
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## Demo
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### ViT
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<img src="https://raw.githubusercontent.com/hpcaitech/public_assets/main/colossalai/img/ViT.png" width="450" />
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- 14x larger batch size, and 5x faster training for Tensor Parallel = 64
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### GPT-3
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<img src="https://raw.githubusercontent.com/hpcaitech/public_assets/main/colossalai/img/GPT3.png" width=700/>
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- Free 50% GPU resources, or 10.7% acceleration
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### GPT-2
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<img src="https://raw.githubusercontent.com/hpcaitech/public_assets/main/colossalai/img/GPT2.png" width=800/>
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- 11x lower GPU RAM, or superlinear scaling
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### BERT
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<img src="https://raw.githubusercontent.com/hpcaitech/public_assets/main/colossalai/img/BERT.png" width=800/>
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- 2x faster training, or 50% longer sequence length
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Please visit our [documentation and tutorials](https://www.colossalai.org/) for more details.
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<p align="right">(<a href="#top">back to top</a>)</p>
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## Installation
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### PyPI
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```bash
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pip install colossalai
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```
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This command will install CUDA extension if your have installed CUDA, NVCC and torch.
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If you don't want to install CUDA extension, you should add `--global-option="--no_cuda_ext"`, like:
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```bash
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pip install colossalai --global-option="--no_cuda_ext"
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```
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If you want to use `ZeRO`, you can run:
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```bash
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pip install colossalai[zero]
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```
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### Install From Source
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> The version of Colossal-AI will be in line with the main branch of the repository. Feel free to raise an issue if you encounter any problem. :)
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```shell
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git clone https://github.com/hpcaitech/ColossalAI.git
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cd ColossalAI
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# install dependency
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pip install -r requirements/requirements.txt
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# install colossalai
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pip install .
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```
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If you don't want to install and enable CUDA kernel fusion (compulsory installation when using fused optimizer):
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```shell
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pip install --global-option="--no_cuda_ext" .
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```
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<p align="right">(<a href="#top">back to top</a>)</p>
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## Use Docker
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Run the following command to build a docker image from Dockerfile provided.
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```bash
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cd ColossalAI
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docker build -t colossalai ./docker
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```
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Run the following command to start the docker container in interactive mode.
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```bash
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docker run -ti --gpus all --rm --ipc=host colossalai bash
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```
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<p align="right">(<a href="#top">back to top</a>)</p>
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## Community
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Join the Colossal-AI community on [Forum](https://github.com/hpcaitech/ColossalAI/discussions),
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[Slack](https://join.slack.com/t/colossalaiworkspace/shared_invite/zt-z7b26eeb-CBp7jouvu~r0~lcFzX832w),
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and [WeChat](https://raw.githubusercontent.com/hpcaitech/public_assets/main/colossalai/img/WeChat.png "qrcode") to share your suggestions, advice, and questions with our engineering team.
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## Contributing
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If you wish to contribute to this project, please follow the guideline in [Contributing](./CONTRIBUTING.md).
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Thanks so much to all of our amazing contributors!
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<a href="https://github.com/hpcaitech/ColossalAI/graphs/contributors"><img src="https://raw.githubusercontent.com/hpcaitech/public_assets/main/colossalai/img/contributor_avatar.png" width="800px"></a>
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*The order of contributor avatars is randomly shuffled.*
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<p align="right">(<a href="#top">back to top</a>)</p>
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## Quick View
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### Start Distributed Training in Lines
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```python
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import colossalai
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from colossalai.utils import get_dataloader
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# my_config can be path to config file or a dictionary obj
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# 'localhost' is only for single node, you need to specify
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# the node name if using multiple nodes
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colossalai.launch(
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config=my_config,
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rank=rank,
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world_size=world_size,
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backend='nccl',
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port=29500,
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host='localhost'
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)
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# build your model
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model = ...
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# build you dataset, the dataloader will have distributed data
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# sampler by default
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train_dataset = ...
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train_dataloader = get_dataloader(dataset=dataset,
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shuffle=True
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)
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# build your optimizer
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optimizer = ...
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# build your loss function
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criterion = ...
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# initialize colossalai
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engine, train_dataloader, _, _ = colossalai.initialize(
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model=model,
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optimizer=optimizer,
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criterion=criterion,
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train_dataloader=train_dataloader
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)
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# start training
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engine.train()
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for epoch in range(NUM_EPOCHS):
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for data, label in train_dataloader:
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engine.zero_grad()
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output = engine(data)
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loss = engine.criterion(output, label)
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engine.backward(loss)
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engine.step()
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```
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### Write a Simple 2D Parallel Model
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Let's say we have a huge MLP model and its very large hidden size makes it difficult to fit into a single GPU. We can
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then distribute the model weights across GPUs in a 2D mesh while you still write your model in a familiar way.
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```python
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from colossalai.nn import Linear2D
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import torch.nn as nn
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class MLP_2D(nn.Module):
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def __init__(self):
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super().__init__()
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self.linear_1 = Linear2D(in_features=1024, out_features=16384)
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self.linear_2 = Linear2D(in_features=16384, out_features=1024)
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def forward(self, x):
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x = self.linear_1(x)
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x = self.linear_2(x)
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return x
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```
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<p align="right">(<a href="#top">back to top</a>)</p>
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## Cite Us
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```
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@article{bian2021colossal,
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title={Colossal-AI: A Unified Deep Learning System For Large-Scale Parallel Training},
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author={Bian, Zhengda and Liu, Hongxin and Wang, Boxiang and Huang, Haichen and Li, Yongbin and Wang, Chuanrui and Cui, Fan and You, Yang},
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journal={arXiv preprint arXiv:2110.14883},
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year={2021}
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}
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```
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<p align="right">(<a href="#top">back to top</a>)</p>
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