update

docs/algo_docs/impala/index.rst

@@ -5,4 +5,5 @@ Algorithms.impala
   :maxdepth: 1
 
   impala
-  vtrace
\ No newline at end of file
+  vtrace
+  
\ No newline at end of file

docs/algo_docs/index.rst

@@ -9,4 +9,5 @@ PARL.Algorithms
   ddpg
   dqn
   policy_gradient
-  ppo
\ No newline at end of file
+  ppo
+  
\ No newline at end of file

docs/conf.py

@@ -35,8 +35,6 @@ import os
 import sys
 import parl
 autodoc_mock_imports = ['paddle']
-sys.path.insert(0, os.path.abspath('.'))
-sys.path.insert(0, os.path.abspath('..'))
 release = parl.__version__
 project = 'PARL'
 copyright = '2019, nlp-ol@baidu.com'