ubuntu安装Anaconda和pytorch

安装Anaconda

下载Anaconda：免费下载 |蟒蛇 (anaconda.com)

给Anaconda执行权限

sudo chmod 777 Anaconda3-2023.03-1-Linux-x86_64.sh

安装Anaconda
- ```
./Anaconda3-2023.03-1-Linux-x86_64.sh
```
- 这些设置基本上可以一直按Enter键
- 中间会让选择一个yes or no的问题，我们肯定直接选择yes
查看一下当前的环境
- ```
conda -V
```

修改环境变量

```
nano ~/.bashrc
```

在最后添加

export PATH=/home/****/anaconda3/bin:$PATH

****为用户名

更新一下环境变量
- ```
source ~/.bashrc
```
查看安装是否成功
- ```
conda -V
```
- 可以看到Anaconda已经安装成功了

问题

1. ubuntu的anaconda无法激活环境

CommandNotFoundError: Your shell has not been properly configured to use 'conda activate'.
To initialize your shell, run

    $ conda init <SHELL_NAME>

Currently supported shells are:
  - bash
  - fish
  - tcsh
  - xonsh
  - zsh
  - powershell

See 'conda init --help' for more information and options.

IMPORTANT: You may need to close and restart your shell after running 'conda init'.

答：

```
conda init bash
```
```
source activate
```

安装pytorch等环境

进入官网查看对应版本

安装

conda install pytorch==1.11.0 torchvision==0.12.0 torchaudio==0.11.0 cudatoolkit=11.3 -c pytorch

测试是否安装成功

#测试pytorch-gpu是否能用
import torch
flag = torch.cuda.is_available()
print(flag)
ngpu= 1
# Decide which device we want to run on
device = torch.device("cuda:0" if (torch.cuda.is_available() and ngpu > 0) else "cpu")
print('cuda设备名：',device)
print('gpu名称：',torch.cuda.get_device_name(0))
print('pytorch版本：',torch.__version__)
print('cuda版本：',torch.version.cuda)
print('cudnn版本号：',torch.backends.cudnn.version())
print('定义一个torch格式的3*3的矩阵：',torch.rand(3,3).cuda())