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Google 送你的一台云电脑,自带显卡

Google 送你的一台云电脑,自带显卡

想学深度学习,显卡太贵甚至缺货。别慌,Google 早就给你备好了一块免费的 GPU,打开浏览器就能用。它叫 Colab

Colab 是什么?

简单说:Google 送你的一台云电脑,自带显卡。

不需要买硬件,不需要装驱动,不需要配 CUDA。打开浏览器 → 写代码 → 点运行。就像用在线文档一样写 Python,但背后跑着的是一块真实的 GPU。

适合谁?

  • 学深度学习的在校生(尤其显卡预算为零的那种)
  • 想快速验证一个模型想法的研究者
  • 需要偶尔跑小规模训练的开发者

不适合谁?

  • 需要连续训练几十小时的项目(免费 GPU 有时限)
  • 处理超大模型(显存不够)
  • 对数据隐私要求极高的场景

三步上手:从零到跑通

第一步:打开 Colab

你需要一个 Google 账号(就是 Gmail 那个,没有的话花 3 分钟注册)。

打开浏览器,输入:colab.research.google.com

进去之后点「新建笔记本」。你会看到一个和 Jupyter Notebook 一模一样的界面——没错,Colab 本质上就是云端版的 Jupyter。

第二步:开启免费 GPU

这是最关键的一步。不操作的话,你用的只是普通 CPU。

点击菜单栏:代码执行程序 → 更改运行时类型

在弹窗里找到「硬件加速器」,下拉选 GPU(通常是 T4)。然后保存。

T4 是什么水平?大约相当于 GTX 1080 Ti,显存 16GB。跑大多数教程级别的小模型绰绰有余。

第三步:连接并测试

点击右上角的「连接」按钮,等几秒钟——看到 RAM 和磁盘的指示条亮起来,就说明环境就绪了。

现在验证一下 GPU 是不是真的到位了。新建一个代码单元格,输入:

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import torchprint(torch.cuda.is_available())        # 应该输出 Trueprint(torch.cuda.get_device_name(0))    # 应该输出 Tesla T4

点击运行——如果看到 True 和 Tesla T4,恭喜你,白嫖成功 🎉

进阶操作:挂载 Google Drive

跑完模型,东西存在哪儿?

Colab 的运行环境是临时的——断开连接后,文件就没了。所以你需要把代码和数据存到 Google Drive 里。

挂载方式很简单,一个命令:

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from google.colab import drivedrive.mount('/content/drive')

运行后会弹出一个授权链接,点开 → 登录 → 复制验证码 → 粘贴回来。之后你的 Google Drive 就会出现在 /content/drive/MyDrive/ 下。

每个 Google 账号自带 15GB 免费空间。放数据集、存模型权重、备份代码,够用很长一段时间。

一条龙实战:安装 PyTorch + 跑个 MNIST

理论讲完,直接上代码。新建一个 Colab 笔记本,按顺序跑:

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# 1. 检查 GPU!nvidia-smi
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# 2. 安装 PyTorch(Colab 通常已预装,以防万一)!pip install torch torchvision
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# 3. 导入 + 下载 MNIST 数据集import torchimport torch.nn as nnimport torchvisionimport torchvision.transforms as transformstransform = transforms.ToTensor()train_set = torchvision.datasets.MNIST(root='./data', train=True, download=True, transform=transform)train_loader = torch.utils.data.DataLoader(train_set, batch_size=64, shuffle=True)
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# 4. 定义一个简单的 CNNclass SimpleCNN(nn.Module):    def __init__(self):        super().__init__()        self.conv = nn.Sequential(            nn.Conv2d(1, 16, 3),            nn.ReLU(),            nn.MaxPool2d(2),            nn.Conv2d(16, 32, 3),            nn.ReLU(),            nn.MaxPool2d(2)        )        self.fc = nn.Linear(32 * 5 * 5, 10)    def forward(self, x):        x = self.conv(x)        x = x.view(x.size(0), -1)        return self.fc(x)device = torch.device('cuda')model = SimpleCNN().to(device)criterion = nn.CrossEntropyLoss()optimizer = torch.optim.Adam(model.parameters(), lr=0.001)
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# 5. 训练 3 个 epochfor epoch in range(3):    for images, labels in train_loader:        images, labels = images.to(device), labels.to(device)        optimizer.zero_grad()        loss = criterion(model(images), labels)        loss.backward()        optimizer.step()    print(f'Epoch {epoch+1} done ✅')

全程不用下载任何软件,浏览器里就跑完了。

常见坑和破解方法

坑 1:跑着跑着断掉了。免费版 Colab 在闲置约 90 分钟后会自动断开,连续使用也有时限(通常几小时)。破解:经常点一点笔记本,别让它闲着;或者重要训练中途把模型权重存到 Drive。

坑 2:显存不够。T4 有 16GB,绝大多数学习场景够了。如果真的不够——要么减小 batch size,要么考虑 Colab Pro(付费升级到 V100 或 A100)。

坑 3:数据集太大,下载到 Colab 很慢。先把数据集上传到 Google Drive,然后挂载读取——Google 内部网络传输快很多。或者用 wget 从国内镜像站下载。

坑 4:装的库重启后就没了。Colab 环境每次重启都是「全新」的。解决方法:把 !pip install 命令写在笔记本第一个单元格,每次重连先跑一遍。

免费 vs 付费,怎么选?

版本
GPU
价格
适合
免费版
T4 (16GB)
0 元
学习、小实验、教程复现
Pay As You Go
按需选择
按用量
偶尔需要更强算力
Colab Pro
V100 / A100
约 $10/月
中等规模训练、kaggle 比赛
Colab Pro+
更好 GPU + 更长运行
约 $50/月
高频重度使用

建议:先白嫖免费版。等真的遇到瓶颈了——T4 实在跑不动了——再考虑升级。

总结

  • Google Colab = 免费云 GPU,浏览器即用
  • 三步上手:打开网页 → 换 GPU 运行时 → 点连接
  • 挂载 Google Drive 存文件,防止断连丢数据
  • 跑 PyTorch / TensorFlow 完全够用,学深度学习不用买显卡

别因为「没有显卡」就放弃学深度学习。打开 Colab,现在就可以开始。


文中的代码已实测可在 Colab 免费版上运行。遇到问题欢迎留言交流。

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  1. CONNECT:[ UseTime:0.001226s ] mysql:host=127.0.0.1;port=3306;dbname=wenku;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.001583s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.000750s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.000694s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.001431s ]
  6. SELECT * FROM `set` [ RunTime:0.000729s ]
  7. SHOW FULL COLUMNS FROM `article` [ RunTime:0.002038s ]
  8. SELECT * FROM `article` WHERE `id` = 859809 LIMIT 1 [ RunTime:0.001578s ]
  9. UPDATE `article` SET `lasttime` = 1784732202 WHERE `id` = 859809 [ RunTime:0.074802s ]
  10. SELECT * FROM `fenlei` WHERE `id` = 64 LIMIT 1 [ RunTime:0.013921s ]
  11. SELECT * FROM `article` WHERE `id` < 859809 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.000668s ]
  12. SELECT * FROM `article` WHERE `id` > 859809 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.011504s ]
  13. SELECT * FROM `article` WHERE `id` < 859809 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.052312s ]
  14. SELECT * FROM `article` WHERE `id` < 859809 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.020632s ]
  15. SELECT * FROM `article` WHERE `id` < 859809 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.056088s ]
0.354377s