How to deal with multiple version of Theano?

[乔睿]

Hi, 

I've been using Lasagne for a while, thank you for developing this amazing package.

Now I am trying to install Lasagne on a high performance server. The server has installed an old version of Theano so I installed the latest version in my own directory and it works fine. But when I install Lasagne it seems to have troubles finding the latest version of Theano. So when I try to import I get this:

>>> import theano

>>> theano.__version__

'0.7.0.dev-ecd9dc0ba6fa70b7f65c6de620c21e502c414c5e'

>>> import lasagne

Traceback (most recent call last):

  File "<stdin>", line 1, in <module>

  File "lasagne/__init__.py", line 17, in <module>

    raise ImportError("Your Theano version is too old." + install_instr)

ImportError: Your Theano version is too old.


Please make sure you install a recent enough version of Theano. Note that a

simple 'pip install theano' will usually give you a version that is too old

for Lasagne. See the installation docs for more details:

http://lasagne.readthedocs.org/en/latest/user/installation.html#theano

I only have write permission in my own directory so I can't uninstall the old version of Theano. Is there a way to specify the right version of Theano that Lasagne should use when installing?

[Kyle McDonald]

I am working in a similar environment where Theano is pre-installed, but I want to update it and use it with Lasagne.

To do this, I just undefine PYTHONPATH before doing anything. For example:

> virtualenv lasagne

> source lasagne/bin/activate

> PYTHONPATH=

> pip install https://github.com/Theano/Theano/archive/master.zip

> pip install https://github.com/Lasagne/Lasagne/archive/master.zip

In my situation, undefining PYTHONPATH is the fastest way to make sure pip isn't looking at any of the preinstalled packages, just the ones in the virtual environment.

There's probably a better way that doesn't leave the PYTHONPATH mangled after running `deactivate`, but I couldn't get it working by modifying the `activate` script so I just do this in a `screen` session :)

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[goo...@jan-schlueter.de]

Instead of checking `theano.__version__`, you should check `theano.__file__`. This will tell you where it imported Theano from. If it's not your home directory, check `sys.path`. Probably the system-wide path (e.g., `/usr/local/python2.7/dist-packages`) is listed before your local one (`/home/.../.local/lib/python2.7/site-packages`). Check if there is any `*.pth` file in `~/.local/lib/python2.7/site-packages` that lists `/usr/local/python2.7/dist-packages` and remove that line to make sure it doesn't take precedence over your home directory. Hope this helps!

[Ray]

This way should work, and I think this will automatically install numpy by pip. In my case it may cause numpy link to the wrong BLAS package.

Really Thanks for replying!

在 2015年11月12日星期四 UTC-5下午5:23:25，Kyle McDonald写道：

[Ray]

Thanks a lot!!

problem solved now

在 2015年11月13日星期五 UTC-5上午6:41:17，goo...@jan-schlueter.de写道：