Hi experts,
I got an import error while importing pytorch_geometric.
My environment:
//======================================
CentOS Linux release 7.6.1810 (Core)
Python 3.6.8 :: Anaconda custom (64-bit)
torch==1.2.0+cpu
torch-cluster==1.4.4
torch-geometric==1.3.1
torch-scatter==1.3.1
torch-sparse==0.4.0
torch-spline-conv==1.1.0
torchvision==0.4.0+cpu
//======================================
Error messages:
//======================================



import torch
import torch_geometric
Traceback (most recent call last):
File “”, line 1, in 
File “/home/hliu/.conda/envs/hliuPython/lib/python3.6/site-packages/torch_geometric/init.py”, line 2, in 
import torch_geometric.nn
File “/home/hliu/.conda/envs/hliuPython/lib/python3.6/site-packages/torch_geometric/nn/init.py”, line 2, in 
from .data_parallel import DataParallel
File “/home/hliu/.conda/envs/hliuPython/lib/python3.6/site-packages/torch_geometric/nn/data_parallel.py”, line 5, in 
from torch_geometric.data import Batch
File “/home/hliu/.conda/envs/hliuPython/lib/python3.6/site-packages/torch_geometric/data/init.py”, line 1, in 
from .data import Data
File “/home/hliu/.conda/envs/hliuPython/lib/python3.6/site-packages/torch_geometric/data/data.py”, line 7, in 
from torch_sparse import coalesce
File “/home/hliu/.conda/envs/hliuPython/lib/python3.6/site-packages/torch_sparse-0.4.0-py3.6-linux-x86_64.egg/torch_sparse/init.py”, line 6, in 
from .spspmm import spspmm
File “/home/hliu/.conda/envs/hliuPython/lib/python3.6/site-packages/torch_sparse-0.4.0-py3.6-linux-x86_64.egg/torch_sparse/spspmm.py”, line 4, in 
import torch_sparse.spspmm_cpu
ImportError: /home/hliu/.conda/envs/hliuPython/lib/python3.6/site-packages/torch_sparse-0.4.0-py3.6-linux-x86_64.egg/torch_sparse/spspmm_cpu.cpython-36m-x86_64-linux-gnu.so: undefined symbol: _ZN3c105ErrorC1ENS_14SourceLocationERKNSt7__cxx1112basic_stringIcSt11char_traitsIcESaIcEEE
// ===========================================