[BUG] Quick start example code does not work about dgl-ke HOT 4 OPEN

# install dgl-cu113 of version 0.8.2
pip install dgl-cu113==0.8.2 dglgo -f https://data.dgl.ai/wheels/repo.html

# install dgl-ke using newest version (the version in pypi hasn't been updated to the newest one on github)
git clone https://github.com/awslabs/dgl-ke.git
cd dgl-ke/python
python setup.py install

Traceback (most recent call last):
  File "/anaconda/envs/dgl-ke/bin/dglke_train", line 33, in <module>
    sys.exit(load_entry_point('dglke==0.1.0.dev0', 'console_scripts', 'dglke_train')())
  File "/anaconda/envs/dgl-ke/bin/dglke_train", line 25, in importlib_load_entry_point
    return next(matches).load()
  File "/anaconda/envs/dgl-ke/lib/python3.10/importlib/metadata/__init__.py", line 171, in load
    module = import_module(match.group('module'))
  File "/anaconda/envs/dgl-ke/lib/python3.10/importlib/__init__.py", line 126, in import_module
    return _bootstrap._gcd_import(name[level:], package, level)
  File "<frozen importlib._bootstrap>", line 1050, in _gcd_import
  File "<frozen importlib._bootstrap>", line 1027, in _find_and_load
  File "<frozen importlib._bootstrap>", line 1006, in _find_and_load_unlocked
  File "<frozen importlib._bootstrap>", line 688, in _load_unlocked
  File "<frozen importlib._bootstrap_external>", line 883, in exec_module
  File "<frozen importlib._bootstrap>", line 241, in _call_with_frames_removed
  File "/anaconda/envs/dgl-ke/lib/python3.10/site-packages/dglke-0.1.0.dev0-py3.10.egg/dglke/train.py", line 23, in <module>
  File "/anaconda/envs/dgl-ke/lib/python3.10/site-packages/dglke-0.1.0.dev0-py3.10.egg/dglke/dataloader/__init__.py", line 21, in <module>
  File "/anaconda/envs/dgl-ke/lib/python3.10/site-packages/dglke-0.1.0.dev0-py3.10.egg/dglke/dataloader/sampler.py", line 23, in <module>
ModuleNotFoundError: No module named 'dgl.backend'