* Update common.py

* fix precision issue

fix #367

- add prioritized dqn
- fix#239

solve #362 

* fix bug of rpm

* fix bug of rpm

* soft link

* fix bug of checking the startup of log_server

* add notification

* add notification

* fix rarfile error in python2

* 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

Helps humans and linters understand what is expected.

* fix compatibility of batch_norm layer

* fix yapf

* fix error with cpu version paddle in the GPU envrionment.

* add ppo

* fix bugs

* yapf

* redirect stdout to log file while initializing the remote actor instance

* add test for catching output in  `Actor.__init__`

* catch `TypeError` in `remote.__del__`

* `log_server_test.py` windows compatibility

* add logger for remote actors

* resolve issues

* `get_free_tcp_port` and `is_port_available` move to utils.py

* add information for user in the remote log web UI

* yapf formatting

* fix unittest error

* yapf formatting

* update remote job web UI

* add option for log server port

* fix windows support

* fix `os.devnull` in windows

* fix port argument passing

* fix bug

* fix kill log_server

* fix log server not started

* add log_server_test
Co-authored-by: NHongsheng Zeng <zenghongsheng@baidu.com>

* upgrade DQN's lr interface compatibility

* yapf

* update example DQN

* fix the bug of recursive creating actors

* add comment

* update comment

* rename test files

* fix workspace bug

* fix the bug of distributing files

* update comment

* ban passing a absolute path

* use kill_process

* Update utils.py

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

* stop using pickle cloud to transmit the remote class

* add VisualDL as summary logging backend

* yapf

* copyright

* using visualdl as the default logging tool

* only support linux at the moment

* yapf

* yapf

* remove dependency on six

* unittest

* yapf

* ping the master before connection

* yapf

* fix comments

* remove the useless library

* install ping for the docker environment

* remove protobuf intallation

* remove evokit test

* replace tensorboard with summary to support VDL in the future

* unittest

* rename keys for record

* yapf

* Update utils.py

* Update utils.py

* state to obs

* yapf & update softlink in offline-q-learning

* first version; unittest in parl/remote is passed

* add windows local unittest shell; fix some incompatible problem

* fix save api

* refine comments and remove log of xparl stop

* fix bug

* Update scripts.py

* Update utils.py

* Update agent_base_test.py

* remove version 1.3 warnings

* update

* yapf

* add algorithms test

* Update algs_test.py

* Update algs_test.py

add SAC DDPG TD3 tests

* yapf

* release v1.2.3

* change dep of liftsim a2c

* fix a2c cannot run in paddle 1.6.0

* fix impala compatibility

* yapf