如何在Python2.7中安装PyTorch？

Question

我正在虚拟环境中使用Python2.7。我尝试在Python2.7中安装PyTorch，但是出现了以下错误：

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

我尝试使用conda install pytorch-cpu -c pytorch以及链接（https://pytorch.org/get-started/locally/）安装，但是没有成功。那么我应该如何在Python版本2.7中安装torch？我想安装pytorch cpu版本。

请帮忙:)

- mimi

---

无论是针对PyTorch还是机器学习，您最好在虚拟环境中安装Python 3。 - anirudh

Answer 1

这是指向PyTorch官方下载页面的链接。

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）等其他相关详细信息。

其他有用的链接：

• Windows
  
• Windows
  
• Mac
  
• Ubuntu
  
• 全部

- Rishab P

Answer 2

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

这是我做的：

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

- Pe Dro

Answer 3

首先安装conda和python2.7：
conda install pytorch torchvision torchaudio cpuonly -c pytorch

然后激活环境：
conda activate python2

接着安装pytorch：
conda install pytorch torchvision torchaudio cpuonly -c pytorch

确认是否安装成功：

python    
import torch
print(torch._ _version_ _)

- shyam maurya

Answer 4

似乎pytorch试图安装一些需要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

您需要在命令中指定要安装PyTorch的Python版本。

- Ishinomori

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那么，您的意思是我应该为Python2.7指定Pytorch版本？ - mimi

你使用的是哪个操作系统？请注意，PyTorch不支持在Windows上使用Python 2.7。 - Ishinomori

我使用Windows。天哪！我不能在Windows上使用Python2.7中的Torch吗？:( - mimi