python2.7如何安装pytorch？

Question

我在虚拟环境中使用 python2.7。我尝试在 python2.7 中安装 pytorch，但出现以下错误：

UnsatisfiableError: The following specifications were found
to be incompatible with the existing python installation in your environment:

  - pytorch-cpu -> python[version='3.5.*|3.6.*']
  - pytorch-cpu -> python[version='>=3.5,<3.6.0a0|>=3.6,<3.7.0a0|>=3.7,<3.8.0a0']

If python is on the left-most side of the chain, that's the version you've asked for.
When python appears to the right, that indicates that the thing on the left is somehow
not available for the python version you are constrained to.  Your current python version
is (python=2.7).  Note that conda will not change your python version to a different minor version
unless you explicitly specify that.

The following specifications were found to be incompatible with each other:



Package wheel conflicts for:
python=2.7 -> pip -> wheel
pytorch-cpu -> python[version='>=3.6,<3.7.0a0'] -> pip -> wheel
Package vc conflicts for:
python=2.7 -> sqlite[version='>=3.27.2,<4.0a0'] -> vc[version='14.*|>=14,<15.0a0|>=14.1,<15.0a0']
python=2.7 -> vc[version='9.*|>=9,<10.0a0']
pytorch-cpu -> numpy[version='>=1.11'] -> vc[version='14|14.*|>=14,<15.0a0']
pytorch-cpu -> vc[version='>=14.1,<15.0a0']
Package cffi conflicts for:
pytorch-cpu -> cffi
pytorch-cpu -> python[version='>=3.6,<3.7.0a0'] -> pip -> requests -> urllib3[version='>=1.21.1,<1.25'] -> cryptography[version='>=1.3.4'] -> cffi[version='>=1.7']
python=2.7 -> pip -> requests -> urllib3[version='>=1.21.1,<1.25'] -> cryptography[version='>=1.3.4'] -> cffi[version='>=1.7']
Package pip conflicts for:
python=2.7 -> pip
pytorch-cpu -> python[version='>=3.6,<3.7.0a0'] -> pip
Package setuptools conflicts for:
python=2.7 -> pip -> setuptools
pytorch-cpu -> python[version='>=3.6,<3.7.0a0'] -> pip -> setuptools
Package msgpack-python conflicts for:
python=2.7 -> pip -> cachecontrol -> msgpack-python
pytorch-cpu -> python[version='>=3.6,<3.7.0a0'] -> pip -> cachecontrol -> msgpack-python

我尝试了 conda install pytorch-cpu -c pytorch 和链接（https://pytorch.org/get-started/locally/）。但它不起作用。那么我应该怎么做才能在python version2.7中安装torch？我想安装 pytorch cpu 版本。

请帮忙:)

Answer 1

这是PyTorch official download page的链接

从这里，您可以根据您的环境和操作系统选择python版本（2.7）和CUDA（无）等相关细节。

其他有用的链接：

• windows
  
• windows
  
• mac
  
• ubuntu
  
• all

Answer 2

似乎 pytorch 尝试安装一些需要 python >= 3.6 版本的包。

Package wheel conflicts for:
python=2.7 -> pip -> wheel
pytorch-cpu -> python[version='>=3.6,<3.7.0a0'] -> pip -> wheel

您必须在命令中指定要安装 pytorch 的 python 版本

Answer 3

对我来说链接https://www.learnopencv.com/installing-deep-learning-frameworks-on-ubuntu-with-cuda-support/中的方法 工作。

这就是我的做法：

!pip install http://download.pytorch.org/whl/cu80/torch-0.2.0.post3-cp27-cp27mu-manylinux1_x86_64.whl

Answer 4

先用python2.7安装conda：
conda install pytorch torchvision torchaudio cpuonly -c pytorch

然后激活环境：
conda 激活 python2

然后安装pytorch：
conda install pytorch torchvision torchaudio cpuonly -c pytorch

检查确认：

python    
import torch
print(torch._ _version_ _)