Incubator-mxnet: version `GOMP_4.0' not found/fedora 23

[NiranjanMudhiraj]

[niranjan@localhost mxnet]$ python example/image-classification/train_mnist.py

Traceback (most recent call last):
  File "example/image-classification/train_mnist.py", line 1, in <module>
    import find_mxnet
  File "/home/niranjan/mxnet/example/image-classification/find_mxnet.py", line 7, in <module>
    import mxnet as mx
  File "/home/niranjan/mxnet/example/image-classification/../../python/mxnet/__init__.py", line 7, in <module>
    from .base import MXNetError
  File "/home/niranjan/mxnet/example/image-classification/../../python/mxnet/base.py", line 43, in <module>
    _LIB = _load_lib()
  File "/home/niranjan/mxnet/example/image-classification/../../python/mxnet/base.py", line 35, in _load_lib
    lib = ctypes.cdll.LoadLibrary(lib_path[0])
  File "/home/niranjan/anaconda/lib/python2.7/ctypes/__init__.py", line 443, in LoadLibrary
    return self._dlltype(name)
  File "/home/niranjan/anaconda/lib/python2.7/ctypes/__init__.py", line 365, in __init__
    self._handle = _dlopen(self._name, mode)
OSError: /lib64/libpangoft2-1.0.so.0: undefined symbol: FcWeightToOpenType

[piiswrong]

libpangoft2 is a gnome library. I'm guessing your opencv is not correctly installed/linked. Try compiling with USE_OPENCV=0 and see if the error persists.

[NiranjanMudhiraj]

i fixed above error by running this,

conda install -c asmeurer pango

but i got another error.

[niranjan@localhost mxnet]$ python example/image-classification/train_mnist.py

Traceback (most recent call last):
  File "example/image-classification/train_mnist.py", line 1, in <module>
    import find_mxnet
  File "/home/niranjan/mxnet/example/image-classification/find_mxnet.py", line 7, in <module>
    import mxnet as mx
  File "/home/niranjan/mxnet/example/image-classification/../../python/mxnet/__init__.py", line 7, in <module>
    from .base import MXNetError
  File "/home/niranjan/mxnet/example/image-classification/../../python/mxnet/base.py", line 43, in <module>
    _LIB = _load_lib()
  File "/home/niranjan/mxnet/example/image-classification/../../python/mxnet/base.py", line 35, in _load_lib
    lib = ctypes.cdll.LoadLibrary(lib_path[0])
  File "/home/niranjan/anaconda/lib/python2.7/ctypes/__init__.py", line 443, in LoadLibrary
    return self._dlltype(name)
  File "/home/niranjan/anaconda/lib/python2.7/ctypes/__init__.py", line 365, in __init__
    self._handle = _dlopen(self._name, mode)
OSError: /home/niranjan/anaconda/bin/../lib/libgomp.so.1: version `GOMP_4.0' not found (required by /home/niranjan/mxnet/python/mxnet/../../lib/libmxnet.so)

[thirdwing]

The system needs GOMP for openmp support. It seems you need to check it.

[NiranjanMudhiraj]

libgcc-5.3.1-2.fc23.x86_64 is already installed in my machine.can you tell me how to fix error.

[thirdwing]

Hi, sorry for the late reply.

I think the OpenMP doesn't install properly on your machine. Can you set USE_OPENMP = 0 and try again?

If it works, at least we know where the error came from.

[NiranjanMudhiraj]

can you tell me how to set USE_OPENMP = 0 , i have openMP version gcc-5.3.1-2.fc23.x86_64

[thirdwing]

In the file https://github.com/dmlc/mxnet/blob/master/make/config.mk#L60

[thirdwing]

I think we can say the problem is from OpenMP.

It is because you are using anaconda, which will link to GOMP_4.0. However, in your system you are using gcc5. So you met the error.

Closing this now. Feel free to reopen it.

[NiranjanMudhiraj]

i set USE_OPENMP = 0 , i tried again it is working without any errors, but python package installation step i got error

[niranjan@localhost mxnet]$ cd python/
[niranjan@localhost python]$ sudo python setup.py install
[sudo] password for niranjan: 
Traceback (most recent call last):
  File "setup.py", line 14, in <module>
    LIB_PATH = libinfo['find_lib_path']()
  File "mxnet/libinfo.py", line 26, in find_lib_path
    elif os.name == "posix" and os.environ['LD_LIBRARY_PATH']:
  File "/usr/lib64/python2.7/UserDict.py", line 23, in __getitem__
    raise KeyError(key)
KeyError: 'LD_LIBRARY_PATH'

[thirdwing]

The same error with https://github.com/dmlc/mxnet/issues/1283

Please wait for a little while.

[r-luo]

I met the same problem as in the 3rd post, but not sure if my solution applies here. I'm on Ubuntu 16.04 with CUDA 8 and CUDNN v5.1.

❯ python train_mnist.py
Traceback (most recent call last):
  File "train_mnist.py", line 1, in <module>
    import find_mxnet
  File "/mnt/raid/user1/Temp/image-classification/find_mxnet.py", line 2, in <module>
    import mxnet as mx
  File "/home/user1/mxnet/python/mxnet/__init__.py", line 7, in <module>
    from .base import MXNetError
  File "/home/user1/mxnet/python/mxnet/base.py", line 43, in <module>
    _LIB = _load_lib()
  File "/home/user1/mxnet/python/mxnet/base.py", line 35, in _load_lib
    lib = ctypes.cdll.LoadLibrary(lib_path[0])
  File "/home/user1/anaconda3/envs/mxnet/lib/python2.7/ctypes/__init__.py", line 440, in LoadLibrary
    return self._dlltype(name)
  File "/home/user1/anaconda3/envs/mxnet/lib/python2.7/ctypes/__init__.py", line 362, in __init__
    self._handle = _dlopen(self._name, mode)
OSError: /home/user1/anaconda3/envs/mxnet/bin/../lib/libgomp.so.1: version `GOMP_4.0' not found (required by /home/user1/mxnet/python/mxnet/../../lib/libmxnet.so)

Then I realised that it's looking at a different place for libgomp.so.1 from what
ldd ~/mxnet/lib/libmxnet.so
says:

❯ ldd lib/libmxnet.so | grep libgomp
    libgomp.so.1 => /usr/lib/x86_64-linux-gnu/libgomp.so.1 (0x00007f3e30635000)

Turns out that those are all just symbolic links to the actual library file libgomp.so.1.0.0

so I replaced /home/user1/anaconda3/envs/mxnet/bin/../lib/libgomp.so.1.0.0 with /usr/lib/x86_64-linux-gnu/libgomp.so.1.0.0 and it proceeded to the next error:

❯ python train_mnist.py
Traceback (most recent call last):
  File "train_mnist.py", line 1, in <module>
    import find_mxnet
  File "/mnt/user1/rluo/Temp/image-classification/find_mxnet.py", line 2, in <module>
    import mxnet as mx
  File "/home/user1/mxnet/python/mxnet/__init__.py", line 7, in <module>
    from .base import MXNetError
  File "/home/user1/mxnet/python/mxnet/base.py", line 43, in <module>
    _LIB = _load_lib()
  File "/home/user1/mxnet/python/mxnet/base.py", line 35, in _load_lib
    lib = ctypes.cdll.LoadLibrary(lib_path[0])
  File "/home/user1/anaconda3/envs/mxnet/lib/python2.7/ctypes/__init__.py", line 440, in LoadLibrary
    return self._dlltype(name)
  File "/home/user1/anaconda3/envs/mxnet/lib/python2.7/ctypes/__init__.py", line 362, in __init__
    self._handle = _dlopen(self._name, mode)
OSError: /home/user1/anaconda3/envs/mxnet/bin/../lib/libstdc++.so.6: version `GLIBCXX_3.4.20' not found (required by /home/user1/mxnet/python/mxnet/../../lib/libmxnet.so)

from here I started to suspect that it's all anaconda's fault...

ldd ~/mxnet/lib/libmxnet.so
returns

❯ ldd lib/libmxnet.so | grep libstdc++
    libstdc++.so.6 => /usr/lib/x86_64-linux-gnu/libstdc++.so.6 (0x00007fadd0a21000)

/home/user1/anaconda3/envs/mxnet/bin/../lib/libstdc++.so.6 linkes to libstdc++.so.6.0.19, while /usr/lib/x86_64-linux-gnu/libstdc++.so.6 links to libstdc++.so.6.0.21

So I copied libstdc++.so.6.0.21 over and changed the symbolic links, and it seems to work fine now.

[LukeMathWalker]

I've the same problem and I've not understood how to apply madcarrot solution :/

[kexul]

Ubuntu 16.10 ,follow the comment ,fisrt changed listdc++,then changed libgomp,then changed pango .It works!

[Soonhwan-Kwon]

Thank you for great solution @madcarrot
in summary

ldd lib/libmxnet.so | grep libgomp
rm /your/path/to/anaconda2/lib/libgomp.so.1
ln -s /usr/lib/x86_64-linux-gnu/libgomp.so.1 /your/path/to//anaconda2/lib/libgomp.so.1
ldd ~/mxnet/lib/libmxnet.so
rm /your/path/to/anaconda2/bin/../lib/libstdc++.so.6
ln -s /usr/lib/x86_64-linux-gnu/libstdc++.so.6 /your/path/to/anaconda2/bin/../lib/libstdc++.so.6

but please be aware that it differs depends on ldd command result