import error

[techfort]

Hi there, great work on this. When i try to compile it under linux 64 bit though i get

neural.c: In function ‘neural_sgd_back_prop’:
neural.c:141:3: error: ‘for’ loop initial declarations are only allowed in C99 or C11 mode
   for (int j = 0; j < cols; j++) {

i tried setting the -std=c++0x flag but to no avail, probably because it's C not C++. Could you look into this? Thanks!

[techfort]

Actually scratch that. I just was unfamiliar with plain C compilation flags.
Using:

CFLAGS="-I/path/to/cblas/include -L/path/to/cblas/lib -lcblas -std=c11" python setup.py build_ext

works just fine.
However, when trying to import it i get:

ImportError: ./pyneural.so: undefined symbol: cblas_saxpy

[tburmeister]

Hi techfort,

Have you installed cblas? If so, the include and library directories (-I and -L) in my example are just placeholders - you need to fill in the actual paths to the cblas include and library directories. cblas_saxpy is part of the cblas library, so I think that error indicates that cblas is not being found.

-Taylor

[techfort]

hey Taylor
cblas is installed and i'm using real paths not placeholders.
I know because before installing cblas it wouldn't even compile.
The whole installation seems to have gone well, but when importing the package into python i'm getting the above error.

[tburmeister]

Hmm, interesting... Probably won't have time to look into this until this evening, but what version of Linux are you using?

[techfort]

Kubuntu 14.04 64-bit. No rush.

[tburmeister]

Hey, finally got around to digging into this. I ran into the same issue trying to install on Ubuntu; apparently it's pretty finicky about compiler flags. I managed to get the library to compile after editing the setup.py, which had the added bonus of making things a little cleaner. Try doing a git pull and then running just:
python setup.py build_ext
sudo python setup.py install
You may need to change the include_dirs and library_dirs in setup.py first, depending on where you installed OpenBLAS.

[techfort]

Hi Taylor,
thanks for that, I'll be trying this out tomorrow and let you know.

[techfort]

Hey, you can close this, it's working perfectly. Note that the LD_LIBRARY_PATH step was necessary, without it python would break complaining libopenblas.so.0 was not found. Thanks!