Building LAPACK included with OpenBLAS requires Fortran compiler.
$ brew install gfortran
$ sudo apt-get install gfortran
Add this line to your application's Gemfile:
And then execute:
$ bundle install
Or install it yourself as:
$ gem install numo-openblas
Note: Numo::OpenBLAS downloads and builds OpenBLAS during installation. In many cases, building OpenBLAS takes a lot of time. In addtion, the building OpenBLAS may fail on Apple M1 mac due to linker error:
ld: warning: object file (...) was built for newer macOS version (...) than being linked (...) ... Undefined symbols for architecture arm64: "___chkstk_darwin", referenced from: _sgemv_ in libopenblas_vortexp-r0.3.19.a(sgemv.o) _sger_ in libopenblas_vortexp-r0.3.19.a(sger.o) _cblas_sgemv in libopenblas_vortexp-r0.3.19.a(cblas_sgemv.o) _cblas_sger in libopenblas_vortexp-r0.3.19.a(cblas_sger.o) _dgemv_ in libopenblas_vortexp-r0.3.19.a(dgemv.o) _dger_ in libopenblas_vortexp-r0.3.19.a(dger.o) _cblas_dgemv in libopenblas_vortexp-r0.3.19.a(cblas_dgemv.o) ... ld: symbol(s) not found for architecture arm64
In that case, you can install it by giving
MACOSX_DEPLOYMENT_TARGET your mac version.
If you are using macOS Monterey, the installation command would be:
$ MACOSX_DEPLOYMENT_TARGET=12.0 gem install numo-openblas
Numo::OpenBLAS loads Numo::NArray and Numo::Linalg using OpenBLAS as a background library. You can use Numo::NArray and Numo::Linalg just by loading Numo::OpenBLAS.
require 'numo/openblas' x = Numo::DFloat.new(5, 2).rand c = x.transpose.dot(x) eig_val, eig_vec = Numo::Linalg.eigh(c)
Moreover, some of the build options are defined by constants.
> Numo::OpenBLAS::OPENBLAS_VERSION => " OpenBLAS 0.3.10 " > Numo::OpenBLAS::OPENBLAS_CHAR_CORENAME => "HASWELL" > Numo::OpenBLAS::OPENBLAS_NUM_CORES => 8
Bug reports and pull requests are welcome on GitHub at https://github.com/yoshoku/numo-openblas. This project is intended to be a safe, welcoming space for collaboration, and contributors are expected to adhere to the Contributor Covenant code of conduct.
The gem is available as open source under the terms of the BSD-3-Clause License.