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doc/python: Demonstrate how to override the blas implementation

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Doron Behar 2023-07-12 15:17:32 +03:00 committed by Martin Weinelt
parent 8e5efa270f
commit 5262a7d1c9
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24
doc/languages-frameworks/python.section.md
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@ -1185,8 +1185,7 @@ following are specific to `buildPythonPackage`:
variables which will be available when the binary is run. For example,
`makeWrapperArgs = ["--set FOO BAR" "--set BAZ QUX"]`.
* `namePrefix`: Prepends text to `${name}` parameter. In case of libraries, this
defaults to `"python3.8-"` for Python 3.8, etc., and in case of applications
to `""`.
defaults to `"python3.8-"` for Python 3.8, etc., and in case of applications to `""`.
* `pipInstallFlags ? []`: A list of strings. Arguments to be passed to `pip
install`. To pass options to `python setup.py install`, use
`--install-option`. E.g., `pipInstallFlags=["--install-option='--cpp_implementation'"]`.
@ -1244,6 +1243,27 @@ with import <nixpkgs> {};
in python.withPackages(ps: [ ps.blaze ])).env
```
The next example shows a non trivial overriding of the `blas` implementation to
be used through out all of the Python package set:
```nix
python3MyBlas = pkgs.python3.override {
packageOverrides = self: super: {
# We need toPythonModule for the package set to evaluate this
blas = super.toPythonModule(super.pkgs.blas.override {
blasProvider = super.pkgs.mkl;
});
lapack = super.toPythonModule(super.pkgs.lapack.override {
lapackProvider = super.pkgs.mkl;
});
};
};
```
This is particularly useful for numpy and scipy users who want to gain speed with other blas implementations.
Note that using simply `scipy = super.scipy.override { blas = super.pkgs.mkl; };` will likely result in
compilation issues, because scipy dependencies need to use the same blas implementation as well.
#### Optional extra dependencies {#python-optional-dependencies}
Some packages define optional dependencies for additional features. With