Does Python SciPy need BLAS

Question

numpy distutils system info BlasNotFoundError       Blas  http   www netlib org blas   libraries not found      Directories to search for the libraries can be specified in the     numpy distutils site cfg file  section  blas   or by setting     the BLAS environment variable    Which tar do I need to download off this site   I ve tried the fortrans  but I keep getting this error  after setting the environment variable obviously

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Following the instructions given by  cfi  works for me  although there are a few pieces they left out that you might need      1  Your lapack directory  after unzipping  may be called lapack-X-Y  some version number   so you can just rename that to LAPACK     cd   src mv lapack- tab  LAPACK   2  In that directory  you may need to do   cd   src LAPACK  cp lapack LINUX a libflapack a

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Try using   sudo apt-get install python3-scipy

User · Answer

The SciPy webpage used to provide build and installation instructions  but the instructions there now rely on OS binary distributions  To build SciPy  and NumPy  on operating systems without precompiled packages of the required libraries  you must build and then statically link to the Fortran libraries BLAS and LAPACK   mkdir -p   src  cd   src  wget http   www netlib org blas blas tgz tar xzf blas tgz cd BLAS-      NOTE  The selected Fortran compiler must be consistent for BLAS  LAPACK  NumPy  and SciPy     For GNU compiler on 32-bit systems   g77 -O2 -fno-second-underscore -c   f                       with g77  gfortran -O2 -std legacy -fno-second-underscore -c   f      with gfortran    OR for GNU compiler on 64-bit systems   g77 -O3 -m64 -fno-second-underscore -fPIC -c   f                       with g77 gfortran -O3 -std legacy -m64 -fno-second-underscore -fPIC -c   f      with gfortran    OR for Intel compiler   ifort -FI -w90 -w95 -cm -O3 -unroll -c   f    Continue below irrespective of compiler  ar r libfblas a   o ranlib libfblas a rm -rf   o export BLAS   src BLAS-  libfblas a   Execute only one of the five g77 gfortran ifort commands  I have commented out all  but the gfortran which I use  The subsequent LAPACK installation requires a Fortran 90 compiler  and since both installs should use the same Fortran compiler  g77 should not be used for BLAS   Next  you ll need to install the LAPACK stuff  The SciPy webpage s instructions helped me here as well  but I had to modify them to suit my environment   mkdir -p   src cd   src  wget http   www netlib org lapack lapack tgz tar xzf lapack tgz cd lapack-   cp INSTALL make inc gfortran make inc            On Linux with lapack-3 2 1 or newer make lapacklib make clean export LAPACK   src lapack-  liblapack a   Update on 3-Sep-2015  Verified some comments today  thanks to all   Before running make lapacklib edit the make inc file and add -fPIC option to OPTS and NOOPT settings  If you are on a 64bit architecture or want to compile for one  also add -m64  It is important that BLAS and LAPACK are compiled with these options set to the same values  If you forget the -fPIC SciPy will actually give you an error about missing symbols and will recommend this switch  The specific section of make inc looks like this in my setup   FORTRAN    gfortran  OPTS       -O2 -frecursive -fPIC -m64 DRVOPTS      OPTS  NOOPT      -O0 -frecursive -fPIC -m64 LOADER     gfortran   On old machines  e g  RedHat 5   gfortran might be installed in an older version  e g  4 1 2  and does not understand option -frecursive  Simply remove it from the make inc file in such cases   The lapack test target of the Makefile fails in my setup because it cannot find the blas libraries  If you are thorough you can temporarily move the blas library to the specified location to test the lapack  I m a lazy person  so I trust the devs to have it working and verify only in SciPy

User · Answer

I guess you are talking about installation in Ubuntu  Just use    apt-get install python-numpy python-scipy   That should take care of the BLAS libraries compiling as well  Else  compiling the BLAS libraries is very difficult

User · Answer

If you need to use the latest versions of SciPy rather than the packaged version  without going through the hassle of building BLAS and LAPACK  you can follow the below procedure   Install linear algebra libraries from repository  for Ubuntu    sudo apt-get install gfortran libopenblas-dev liblapack-dev   Then install SciPy   after downloading the SciPy source   python setup py install or  pip install scipy   As the case may be

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For Windows users there is a nice binary package by Chris  warning  it s a pretty large download  191 nbsp MB     http   www lfd uci edu  gohlke pythonlibs  scipy-stack

User · Answer

On Fedora  this works     yum install lapack lapack-devel blas blas-devel  pip install numpy  pip install scipy   Remember to install  lapack-devel  and  blas-devel  in addition to  blas  and  lapack  otherwise you ll get the error you mentioned or the  numpy distutils system info LapackNotFoundError  error

[python] Does Python SciPy need BLAS?

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