dgl: Import error from installation from source

🐛 Bug

To Reproduce

Steps to reproduce the behavior:

1. Built master branch (cd2cf60) from source https://docs.dgl.ai/en/0.6.x/install/
2. import dgl in python shell
3. got import error message :

[GCC 7.3.0] :: Anaconda, Inc. on linux
Type "help", "copyright", "credits" or "license" for more information.
>>> import dgl
[23:48:28] /home/tiger/usr_name/dgl/src/runtime/tensordispatch.cc:43: TensorDispatcher: dlopen failed: /home/tiger/anaconda3/envs/usr_name/lib/python3.8/site-packages/dgl-0.8-py3.8-linux-x86_64.egg/dgl/tensoradapter/pytorch/libtensoradapter_pytorch_1.9.0.so: cannot open shared object file: No such file or directory
Using backend: pytorch
>>>

Environment

• DGL Version (e.g., 1.0): 0.8
• Backend Library & Version (e.g., PyTorch 0.4.1, MXNet/Gluon 1.3): PyTorch 1.9.0
• OS (e.g., Linux): Debian
• How you installed DGL: source
• Build command you used (if compiling from source):

git clone --recurse-submodules https://github.com/dmlc/dgl.git
sudo apt-get update
sudo apt-get install -y build-essential python3-dev make cmake
cd dgl
mkdir build
cd build
cmake ..
make -j4

• Python version: 3.8.5
• CUDA/cuDNN version (if applicable): NA
• GPU models and configuration (e.g. V100): NA
• Any other relevant information: