Faiss安装问题解决

一、使用conda安装

安装conda（略）
安装faiss

CPU版本：conda install -c pytorch faiss-cpu
GPU版本：conda install faiss-gpu cudatoolkit=11 -c pytorch

我下载的python版本是3.9的，导致无法安装faiss，报错如下

Collecting package metadata (current_repodata.json): done
Solving environment: failed with initial frozen solve. Retrying with flexible solve.
Solving environment: failed with repodata from current_repodata.json, will retry with next repodata source.
Collecting package metadata (repodata.json): done
Solving environment: failed with initial frozen solve. Retrying with flexible solve.
Solving environment: \
Found conflicts! Looking for incompatible packages.
This can take several minutes.  Press CTRL-C to abort.
failed                                                                                                                                                                                 UnsatisfiableError: The following specifications were found
to be incompatible with the existing python installation in your environment:Specifications:- faiss-gpu -> python[version='>=2.7,<2.8.0a0|>=3.6,<3.7.0a0|>=3.8,<3.9.0a0|>=3.7,<3.8.0a0|>=3.5,<3.6.0a0']Your python: python=3.9If 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. Note that conda will not
change your python version to a different minor version unless you explicitly specify
that.

需要对python进行降级

conda install python=3.8

Openblas在线安装

sudo apt-get install libopenblas-dev

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