Import caffe/scipy error: liblapack.so.3: undefined symbol: sgetrs_N_single

Question

I installed Caffe on a stock Ubuntu 16.04 system running on a Jetson TX1. It was running fine until I compiled and installed OpenBlas, then started getting this error in importing caffe in Python 2:

>>> import caffe

[ Large stack backtrace omitted]

from scipy.linalg import _fblas
ImportError: /usr/lib/liblapack.so.3: undefined symbol: sgetrs_N_single

I was able to get back running by using this command:

sudo update-alternatives --config liblapack.so.3

and choosing the liblapack.so.3 in /usr/lib , not in /usr/lib/openblas-base .

I'd rather not have to do this each time I install OpenBlas. I've Googled for this error, but didn't see any solutions come up. Anyone see this?

Answer 1

Looking in the source of openblas, it looks like this symbol is used in a Makfile for building getrs .

It appears that this library is missing a set of underlying binaries. sgetrs_N_single is the first in the makefile, but I suspect if it were removed you would get the same error next for sgetrs_T_single . When the shared library looks for this sub-component, it can't find it. I suspect something went wrong too quietly in the build or there is a step missing in the build instructions.