I cloned the extension-cpp repo 35, and setup installed the cpp extension for lltm, but when run the following instructions:
import torch
import lltm

error thrown:
lltm_cpp.cpython-36m-x86_64-linux-gnu.so: undefined symbol: _ZN3c105ErrorC1ENS_14SourceLocationERKSs

btw, I did compile pytorch and cpp extension using gcc 5.4.
System info:
CUDA 9.0
CUDNN 7.1.4
Python 3.6.4
PyTorch 1.0
miniconda 3
GCC 5.4.0