Import Error:

[facebookresearch]

Import Error:

[btgraham]

Sorry you are having problems.
What version of Ubuntu are you using?
One possible solution may be to install PyTorch inside a conda environment (download from https://conda.io/miniconda.html) and then run 'python setup.py develop' in the conda environment.
Ben

[mmderakhshani]

Thanks for your response Mr. @btgraham. The Ubutntu version of mine is 16.04. My installation procedure is as same as your suggestion. I have installed the Anaconda and then create a virtual environment called sparse in that and activate it using source activate sparse. Then I have run following commands

sudo apt-get install libsparsehash-dev
git clone [email protected]:facebookresearch/SparseConvNet.git
cd SparseConvNet/PyTorch/
python setup.py develop

I think the installation did not have any problems and also no warnings and errors. But when I want to import sparseconvnet for example in an ipython, it generates the aforementioned error.

Here is the stack trace:

ImportError Traceback (most recent call last)
in ()
----> 1 import sparseconvnet

/home/mohammad/SparseConvNet-master/PyTorch/sparseconvnet/init.py in ()
7 forward_pass_multiplyAdd_count = 0
8 forward_pass_hidden_states = 0
----> 9 from .activations import Tanh, Sigmoid, ReLU, ELU
10 from .averagePooling import AveragePooling
11 from .batchNormalization import BatchNormalization, BatchNormReLU, BatchNormLeakyReLU

/home/mohammad/SparseConvNet-master/PyTorch/sparseconvnet/activations.py in ()
9 from torch.autograd import Function, Variable
10 from torch.nn import Module, Parameter
---> 11 from .utils import *
12 from .sparseConvNetTensor import SparseConvNetTensor
13 from .batchNormalization import BatchNormalization

/home/mohammad/SparseConvNet-master/PyTorch/sparseconvnet/utils.py in ()
6
7 import torch
----> 8 import sparseconvnet.SCN as scn
9 from cffi import FFI
10

/home/mohammad/SparseConvNet-master/PyTorch/sparseconvnet/SCN/init.py in ()
1
2 from torch.utils.ffi import _wrap_function
----> 3 from ._SCN import lib as _lib, ffi as _ffi
4
5 all = []

ImportError: /home/mohammad/SparseConvNet-master/PyTorch/sparseconvnet/SCN/_SCN.so: undefined symbol: _ZNSt12length_errorC1EPKc

[btgraham]

Hmm. Can you please try taking the attached file, and moving it to PyTorch/setup.py (so remove the .txt from the filename) and rerunning 'python setup.py develop' command.

setup.py.txt

[mmderakhshani]

@btgraham, Same error as above.

[lawrencekiba]

_ZN3c105ErrorC1ENS_14SourceLocationERKSs

Resolved by reinstalling PyTorch