* make remote client support multiprocessing

* refine unittest

* refine unittest

* refine comment

* Add parl monitor.

* Add clustermonitor.py

* Fix thread safety bug.

* Fix js bugs.

* Fix End of Files.

* fix cluster_test bug

* yapf error

* fix bugs in tests/job_center_test.py

* fix bugs in tests/job_center_test.py

* add test_cluster_monitor.py

* add worker.exit in test_cluster_monitor.py

* Update model-based.md

* Update and rename model-based.md to archive.md

* add learning curve for ES

* add learning curve for ES

* support new APIs of the cluster

* Update README.md

* Update README.md

* Update README.md

* Update README.md

* Update README.md

* rename learner.py

* Update README.md

* Update README.md

* Update README.cn.md

* Update README.md

* Update README.cn.md

* Update README.md

* ES example

* refine settings

* fix yapf

* refine documentation; remove csv logger

* fix bug

* merge learner.py and train.py; add version requirements of gym and atari_py

* unify actor num

* fix bug of ParamAttr

* refine imports of unittest

* fix a number of bug

* update comments

* paddle license

* revert the change on client_not_init_test.py

* fix timeout bug & unnitest

* add unit test for potential bugs

* yapf

* unit test

* logger

* logger#2

* fix job's bug that will cause dead-lock

* fix bug

* add missing files

* solve hanging

* fix comments; exit job completely

* hanging problem

* hanging problem#2

* hanging_program#3

* CMAKE

* remove unused variables

* add new_alg.rst

* rename LiftSim_demo as LiftSim_baseline

* Update new_alg.rst

* Update new_alg.rst

* fix bug: removing the job from the cluster twice; add test scripts

* fix attribute error

* fix comment

* rename

* fix the bug in unit test

* remove queue

* add liftsim baseline

* yapf

* yapf...

* modify acc. comments

* yapf

* yapf..........

* yapf!

why is yapf on paddle different from that on my mac!!!!!

* fix the vital issue on compatibility

* resolve the warning log

* yapf

* yapf

* first pr

* start a worker when the master is started.

* First PR & Fix logger bugs.

* update docs for a2c, impala and ga3c

* update doc

* yapf modification

* update logger

* yapf correct

* yapf

* setup.py

* old setup.py

* worker 86

* add docs for the cluster

* mispelling issues

* minor change

* fix comment

* fix comments from yuxiang

* fix comment

* fix the bug of hyperlink

* rename

* release version 1.1.1

* add version requirement of tensorboard

* new feature: save params

* add unittest for save()/retore()

* add an example demonstrating the usage

* rename the variable

* yapf

* fix comment

* fix the bug in building  the the docs

* update the version of the required Paddle

* fix the compatibility issue

* fix the comment issue

* support paddle 1.5.1 and replace PE with compiler

* yapf&copyright

* yapf

* fix the teamcity problem

* fix the teamcity problem

* fix comment

* only support paddle 1.5.1

* Cmake

* fix comment

* add documentaion for basic classes

* change the order of three basic classes

* fix commemt & yapf

* comment #2

* yapf#3

* fix commemt@zhs

* minor change

* modify comment

* Update algorithm.py

* Update agent.py

* Update algorithm.py

* fix issue#101

* yapf

* fix some problems of tensorboard

* yapf

* fix the compatibility issue

* fix the comment issue

* support paddle 1.5.1 and replace PE with compiler

* yapf&copyright

* yapf

* fix the teamcity problem

* fix the teamcity problem

* fix comment

* only support paddle 1.5.1

* Cmake

* fix comment

* fix the compatibility issue

* fix the comment issue

* add the tutorial: getting started

* fix commemt

* minor change

* remove previous algorithms; use the forward function in parl.Model

* remove abundant lines

* yapf

* intra-version: move parl.framework into parl.core.fluid

* add folder: parl.core

* remove former test folders

* yapf

* yapf0.24

* add tensorboardX

* yapf

* Code License

* Update model-based.md

* make the quickstart more compact

* remove args in the main function

* yapf

* add gif

* remove render

* Update README.md

* Update README.md

* Update README.md

* add unittest for compling the docs

* record the time of change

* remove unused requirements

* reduce font size of the changelog

* Update README.cn.md

* Update README.md

* Update README.md

* Update README.cn.md

* Update README.md

* Update README.md

* Update README.md

* Update README.md

* Update README.md

* test

* add installation of the current package

* remove the dependencies file

* test_docs

* Create index.md

* Delete index.md

* check yapf

* remove source

* Update conf.py

* update requirements

* add a new line at the end

* Fix End of Files

* fix-end-of-line

* remove requirements.txt

* Update .readthedocs.yml

* refine A2C example

* fix unittest in python2; fix codestyle

* fix codestyle

* refine comment

* add traceback of remote function calling

* assert traceback information

* support serialize/deserialize instance of custom class

* update version requirement of dependences

* remove requirements of unittest which are included in parl

* use fashion style of pyarrow serialization context; add thread safe unittest of serialize/deserialize

* add thread-safe test of remote module; add more exception tips of serialize/deserialize

* refine comment

Now we can check the parl version by calling parl.__version__