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# Colossal-AI
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<div id="top" align="center">
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[](https://www.colossalai.org/)
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一个整合高效并行技术的AI大模型训练系统。
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<h3> <a href="https://arxiv.org/abs/2110.14883"> 论文 </a> |
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<a href="https://www.colossalai.org/"> 文档 </a> |
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<a href="https://github.com/hpcaitech/ColossalAI-Examples"> 例程 </a> |
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<a href="https://github.com/hpcaitech/ColossalAI/discussions"> 论坛 </a> |
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<a href="https://medium.com/@hpcaitech"> 博客 </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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## 目录
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<ul>
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<li><a href="#特点">特点</a> </li>
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<li>
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<a href="#展示样例">展示样例</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="#安装">安装</a>
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<ul>
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<li><a href="#PyPI">PyPI</a></li>
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<li><a href="#从源代码安装">从源代码安装</a></li>
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</ul>
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</li>
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<li><a href="#使用-Docker">使用 Docker</a></li>
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<li><a href="#社区">社区</a></li>
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<li><a href="#做出贡献">做出贡献</a></li>
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<li><a href="#快速预览">快速预览</a></li>
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<ul>
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<li><a href="#几行代码开启分布式训练">几行代码开启分布式训练</a></li>
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<li><a href="#构建一个简单的2维并行模型">构建一个简单的2维并行模型</a></li>
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</ul>
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<li><a href="#引用我们">引用我们</a></li>
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</ul>
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## 特点
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Colossal-AI为您提供了一系列并行训练组件。我们的目标是让您的分布式AI模型训练像普通的单GPU模型一样简单。我们提供的友好工具可以让您在几行代码内快速开始分布式训练。
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- 数据并行
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- 流水线并行
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- 1维, 2维, 2.5维, 3维张量并行
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- 序列并行
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- 友好的trainer和engine
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- 可扩展新的并行方式
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- 混合精度
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- 零冗余优化器 (ZeRO)
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<p align="right">(<a href="#top">返回顶端</a>)</p>
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## 展示样例
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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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- 14倍批大小和5倍训练速度（张量并行=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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- 释放 50% GPU 资源占用, 或 10.7% 加速
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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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- 降低11倍GPU显存占用，或超线性扩展（张量并行）
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<img src="https://raw.githubusercontent.com/hpcaitech/public_assets/main/colossalai/img/Colossal-AI%20with%20ZeRO.jpg" width=393>
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- 能训练接近11倍大小的模型（ZeRO）
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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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- 2倍训练速度，或1.5倍序列长度
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请访问我们的[文档和教程](https://www.colossalai.org/)以了解详情。
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<p align="right">(<a href="#top">返回顶端</a>)</p>
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## 安装
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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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该命令将会安装CUDA extension，如果你已安装CUDA, NVCC和torch。
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如果你不想安装CUDA extension, 可在命令中添加`--global-option="--no_cuda_ext"`, 例如:
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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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如果你想使用`ZeRO`, 你可以使用:
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```bash
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pip install colossalai[zero]
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```
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### 从源代码安装
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> Colossal-AI的版本将与该项目的主分支保持一致。欢迎通过issue反馈你遇到的任何问题 :)
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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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# 安装依赖
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pip install -r requirements/requirements.txt
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# 安装 colossalai
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pip install .
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```
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如果你不想安装和使用CUDA kernel fusion (使用fused优化器需安装):
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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">返回顶端</a>)</p>
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## 使用 Docker
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运行以下命令从我们提供的docker文件中建立docker镜像。
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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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运行以下命令从以交互式启动docker镜像.
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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">返回顶端</a>)</p>
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## 社区
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欢迎通过[论坛](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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或[微信](https://raw.githubusercontent.com/hpcaitech/public_assets/main/colossalai/img/WeChat.png "qrcode")加入Colossal-AI社区，与我们分享你的建议和问题。
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## 做出贡献
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欢迎为该项目做出贡献，请参阅[贡献指南](./CONTRIBUTING.md)。
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真诚感谢所有贡献者！
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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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*贡献者头像的展示顺序是随机的。*
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<p align="right">(<a href="#top">返回顶端</a>)</p>
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## 快速预览
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### 几行代码开启分布式训练
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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可以是config文件的路径或字典对象
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# 'localhost' 仅适用于单节点，在多节点时需指明节点名
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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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# 构建模型
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model = ...
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# 构建数据集, dataloader会默认处理分布式数据sampler
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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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# 构建优化器
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optimizer = ...
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# 构建损失函数
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criterion = ...
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# 初始化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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# 开始训练
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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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### 构建一个简单的2维并行模型
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假设我们有一个非常巨大的MLP模型，它巨大的hidden size使得它难以被单个GPU容纳。我们可以将该模型的权重以二维网格的形式分配到多个GPU上，且保持你熟悉的模型构建方式。
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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">返回顶端</a>)</p>
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## 引用我们
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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">返回顶端</a>)</p>
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