* fix self.alg

* torch agent initialization

* remove definition of self.alg in PPO

* replace self.algorithm with self.alg

* remove unnecessary definition of self.alg

* fix cn readme

* unittest

* yapf

* Travis CI: Discover undefined names in Python code

Blocked by #304 and #305

* Add linter directive # noqa: F821

* Flake8: Add E722 do not use bare 'except'

* Flake8: Remove bare 'except' and open #309

#309

% `python3.8`
```
>>> 0 is 0
<stdin>:1: SyntaxWarning: "is" with a literal. Did you mean "=="?
>>> 'Double' is 'Double'
<stdin>:1: SyntaxWarning: "is" with a literal. Did you mean "=="?
```

* add ppo

* fix bugs

* yapf

* version 0.1

* fix bug

* Update README.md

* Update README.md

* fix yapf
Co-authored-by: NTomorrowIsAnOtherDay <2466956298@qq.com>

* replace tensorboard with summary to support VDL in the future

* unittest

* rename keys for record

* yapf

* state to obs

* yapf & update softlink in offline-q-learning

* torch benchmark policy gradient

* refine comments and use native api

* add pytorch a2c

* add set/get_weights test & copyright

* yapf....

* Update model_base_test_torch.py

* update

* Delete banma.py

* Update model_base_test_torch.py

* update

* Update model.py

* update torch tests

* Update model_base_test_torch.py

* git commit -m torchdqn

* yapf

* fix bugs

* fix bugs

* fix bugs

* yapf

* remove fstring format

* torch_test yapf

* yapf

* Add torch in unittest.requirements

* update torch_unittest

* Torch and FLUID conflict problem in __init__.py

* Unittest fail for torch when both torch and fluid exists.

* cluster_test fail in the unittest, add timeout seconds.

* Torch backend for PARL

* add sleep time for unit test send_job_test.py

* Unit test for send_job_test.py

* use multiple try for unit test

* Fix compatibility for python2.7.

* fix send_job_test.py bugs

* check file exist before send_job_test.py

* Modify send_job_test.py