Dependency issues of libdali.so and backend_impl.so

Hi, I met a strange issue when after compiling DALI from scratch on Ubuntu 18.04, Anaconda python 3.6.

I created a {build_root} for compile process, and no error occurred during compiling. But as long as I renamed or deleted the "{build_root}/dali/python/nvidia/dali/libdali.so" file, I would get the following error when excuting import:

python -c "import nvidia.dali"
Traceback (most recent call last):
  File "<string>", line 1, in <module>
  File "/home/room/anaconda3/lib/python3.6/site-packages/nvidia/dali/__init__.py", line 17, in <module>
    from . import ops
  File "/home/room/anaconda3/lib/python3.6/site-packages/nvidia/dali/ops.py", line 19, in <module>
    from nvidia.dali import backend as b
  File "/home/room/anaconda3/lib/python3.6/site-packages/nvidia/dali/backend.py", line 15, in <module>
    from nvidia.dali.backend_impl import *
ImportError: libdali.so: cannot open shared object file: No such file or directory

The python site-packages dir has the correct libdali.so file, but it seems that "backend_impl.cpython-36m-x86_64-linux-gnu.so" can only recognize "libdali.so" in the {build_root}, not site-packages dir in python. I guess there might be some dependency issues here ?

Any tips?

Start with the compiled dali/python/nvidia/dali/libdali.so and backend_impl.cpython-36m-x86_64-linux-gnu.so, then reproduce the failure with python -c "import nvidia.dali" after removing the build-tree library. Compare the dependency resolution with the copy in the Python site-packages directory; done means the import works without the build-root libdali.so.