Using Theano on Windows: missing lazylinker_ext.pyd - windows

Question

When running a Python script that contain import theano, I get this error:
===============================
00001 #include <Python.h>
00002 #include "structmember.h"
00003 #include <sys/time.h>
00004
00005 // Old Python compatibility from here:
00006 // http://www.python.org/dev/peps/pep-0353/
[...]
01077 return RETVAL;
01078 }
01079
01080
Problem occurred during compilation with the command line below:
C:\programming\cpp\gcc-4.9.2-tdm-1-core\bin\g++.exe -shared -g -D NPY_NO_DEPRECATED_API=NPY_1_7_API_VERSION -m64 -DMS_WIN64 -IC:\Anaconda\lib\site-packages\numpy\core\include -IC:\Anaconda\include -o C:\Users\Francky\AppData\Local\Theano\compiledir_Windows-7-6.1.7601-SP1-Intel64_Family_6_Model_58_Stepping_9_GenuineIntel-2.7.10-64\lazylinker_ext\lazylinker_ext.pyd C:\Users\Francky\AppData\Local\Theano\compiledir_Windows-7-6.1.7601-SP1-Intel64_Family_6_Model_58_Stepping_9_GenuineIntel-2.7.10-64\lazylinker_ext\mod.cpp -LC:\Anaconda\libs -LC:\Anaconda -lpython27
===============================
g++.exe: error: CreateProcess: No such file or directory
Traceback (most recent call last):
File "C:\Users\Francky\Documents\GitHub\nlp\6864project\code\theano\eval_dialog_cat.py", line 7, in <module>
import theano
File "c:\users\francky\downloads\theano-rel-0.7\theano-rel-0.7\theano\__init__.py", line 55, in <module>
from theano.compile import \
File "c:\users\francky\downloads\theano-rel-0.7\theano-rel-0.7\theano\compile\__init__.py", line 9, in <module>
from theano.compile.function_module import *
File "c:\users\francky\downloads\theano-rel-0.7\theano-rel-0.7\theano\compile\function_module.py", line 18, in <module>
import theano.compile.mode
File "c:\users\francky\downloads\theano-rel-0.7\theano-rel-0.7\theano\compile\mode.py", line 11, in <module>
import theano.gof.vm
File "c:\users\francky\downloads\theano-rel-0.7\theano-rel-0.7\theano\gof\vm.py", line 568, in <module>
import lazylinker_c
File "c:\users\francky\downloads\theano-rel-0.7\theano-rel-0.7\theano\gof\lazylinker_c.py", line 116, in <module>
preargs=args)
File "c:\users\francky\downloads\theano-rel-0.7\theano-rel-0.7\theano\gof\cmodule.py", line 2010, in compile_str
(status, compile_stderr.replace('\n', '. ')))
. ception: Compilation failed (return status=1): g++.exe: error: CreateProcess: No such file or directory
It looks like g++.exe: error: CreateProcess: No such file or directory is caused by the absence of the file C:\Users\Francky\AppData\Local\Theano\compiledir_Windows-7-6.1.7601-SP1-Intel64_Family_6_Model_58_Stepping_9_GenuineIntel-2.7.10-64\lazylinker_ext\lazylinker_ext.pyd. How am I supposed to get this file?
I have installed Theano in Anaconda Python 2.7.10 X64 as follows:
conda install mingw libpython
pip install theano
Then I changed the g++ compiler namely TDM-GCC MinGW Compiler so that it compiles to x64 (otherwise I get C:\Users\Francky\AppData\Local\Theano\compiledir_Windows-7-6.1.7601-SP1-Intel64_Family_6_Model_58_Stepping_9_GenuineIntel-2.7.10-64\lazylinker_ext\mod.cpp:1: sorry, unimplemented: 64-bit mode not compiled in).

Answer 1

From here.
Have you closed your Command window and opened a new one? Changes to your environment variables (via the standard Windows dialogue window) will not apply to open Command windows (you could set the variables separately and manually in an open Command window though).
If setting environment variables doesn't help, the other answers to the linked question may help.

Answer 2

I've spent a couple of days on this. Ultimately I had to update theano AFTER changing my G++ compiler to 64 bit (I used http://mingw-w64.org/doku.php). Windows "where" command makes it easy to see where the g++ is installed: where g++ gave me several locations including the 32bit version.