Python glmnet “No module named _glmnet”

问题

UPDATE Getting close. Now I'm running f2py on the .pyf file that should generate the _glmnet module.

I build the package python-glmnet packet with the following command.

python setup.py config_fc --fcompiler=gnu95         
                                           --f77flags='-fdefault-real-8'         
                                          --f90flags='-fdefault-real-8' build

But when I import the module I get this error:

File "/Users/rose/221/tagger/tagger/glmnet/glmnet.py", line 2, in import _glmnet ImportError: No module named _glmnet

How can I import that module?

The glmnet directory also contains a glmnet.pyf file that begins with the following:

!    -*- f90 -*-
! Note: the context of this file is case sensitive.

python module _glmnet ! in
    interface  ! in :_glmnet
        subroutine elnet(ka,parm,no,ni,x,y,w,jd,vp,ne,nx,nlam,flmin,ulam,thr,isd,lmu,a0,ca,ia,nin,rsq,alm,nlp,jerr) ! in :glmnet:glmnet.f
            integer optional :: ka=1 ! Use covariance updates over naive by default
            real*8 :: parm
            integer intent(hide),check(shape(x,0)==no),depend(x) :: no=shape(x,0)
            integer intent(hide),check(shape(x,1)==ni),depend(x) :: ni=shape(x,1)
            real*8 dimension(no,ni) :: x
            real*8 dimension(no),depend(no) :: y
            real*8 dimension(no),depend(no) :: w
            integer dimension(*) :: jd
            real*8 dimension(ni),depend(ni) :: vp
            integer optional,depend(x) :: ne=min(shape(x,1), nx)
            integer :: nx
            integer optional,check((flmin < 1.0 || len(ulam)==nlam)),depend(flmin,ulam) :: nlam=len(ulam)
            real*8 :: flmin
            real*8 dimension(nlam) :: ulam
            real*8 :: thr
            integer optional :: isd=1 ! Standardize predictors by default

UPDATE

Where can I find this _glmnet module? Is it contained in the glmnet.pyf file, as shown below? I tried adding this glment folder to my PYTHONPATH, but that didn't change anything.

~/221/tagger/tagger/glmnet master ls
__init__.py                  example_lasso_elastic_net.py glmnet.pyc
__init__.pyc                 glmnet.f                     glmnet.pyf
elastic_net.py               glmnet.py
~/221/tagger/tagger/glmnet master head -10 glmnet.pyf
!    -*- f90 -*-
! Note: the context of this file is case sensitive.

python module _glmnet ! in
    interface  ! in :_glmnet
        subroutine elnet(ka,parm,no,ni,x,y,w,jd,vp,ne,nx,nlam,flmin,ulam,thr,isd,lmu,a0,ca,ia,nin,rsq,alm,nlp,jerr) ! in :glmnet:glmnet.f
            integer optional :: ka=1 ! Use covariance updates over naive by default
            real*8 :: parm
            integer intent(hide),check(shape(x,0)==no),depend(x) :: no=shape(x,0)
            integer intent(hide),check(shape(x,1)==ni),depend(x) :: ni=shape(x,1)
~/221/tagger/tagger/glmnet master echo $PYTHONPATH
/Users/rose/221/tagger/tagger/glmnet:
~/221/tagger/tagger/glmnet master cd ..
~/221/tagger/tagger master python main.py
Traceback (most recent call last):
  File "main.py", line 14, in <module>
    from glmnet import glmnet
  File "/Users/rose/221/tagger/tagger/glmnet/glmnet.py", line 2, in <module>
    import _glmnet
ImportError: No module named _glmnet

回答1:

As far as I can tell from the source, it's looking for the _gmlnet module, which is defined in gmlnet.pyf. gmlnet.pyf is not a python module, it's a set of additional instructions for a program called f2py, and python will ignore the .pyf file. You need to compile the .pyf file along with a fortran file using f2py. Use a command like this:

f2py -c --fcompiler=gnu95 gmlnet.pyf gmlnet.f

Try installing f2py and then reinstalling the gmlnet package.

回答2:

Without knowing too much about what else is going on, this looks like python doesn't know where the _gmlnet package is located. If you haven't already, check the contents of your PYTHONPATH environment variable with echo $PYTHONPATH. If the _gmlnet directory isn't in there, you need to add it.

To add something to PYTHONPATH in bash, run the following command:

export PYTHONPATH=/path/to/_gmlnet/directory:$PYTHONPATH
You can check that python has parsed this correctly by going into the interactive terminal and typing

import sys

print sys.path
Lastly, you likely don't want to have to type this into your shell each time you start up your terminal. For Mac OS, add the following to the end of your ~/.bash_profile file if you use bash. Make sure that this file ends with a newline.

export PYTHONPATH=/path/to/_gmlnet/directory:$PYTHONPATH

来源：https://stackoverflow.com/questions/20459390/python-glmnet-no-module-named-glmnet

标签

python

fortran

glmnet