reduce travis-ci time of build_doc

doc/templates/conf.py.cn.in

@@ -15,12 +15,11 @@ import sys
 import os, subprocess
 import shlex
 from recommonmark import parser, transform
+sys.path.append(os.path.abspath('@PROJ_ROOT@/python'))
 try:
-   import py_paddle
    import paddle
    import paddle.v2
 except ImportError:
-   print("Must install paddle python package before generating documentation")
    sys.exit(1)
 
 MarkdownParser = parser.CommonMarkParser

doc/templates/conf.py.en.in

@@ -15,12 +15,11 @@ import sys
 import os, subprocess
 import shlex
 from recommonmark import parser, transform
+sys.path.append(os.path.abspath('@PROJ_ROOT@/python'))
 try:
-   import py_paddle
    import paddle
    import paddle.v2
 except ImportError:
-   print("Must install paddle python package before generating documentation")
    sys.exit(1)
 
 

paddle/scripts/travis/build_doc.sh

@@ -5,13 +5,6 @@ set -e
 mkdir -p $TRAVIS_BUILD_DIR/build
 cd $TRAVIS_BUILD_DIR/build
 
-# Compile paddle binaries first
-cmake .. -DCMAKE_BUILD_TYPE=Debug -DWITH_GPU=OFF -DWITH_DOC=OFF -DWITH_MKLDNN=OFF -DWITH_MKLML=OFF -DWITH_GOLANG=ON -DWITH_STYLE_CHECK=OFF
-
-mkdir output
-make -j `nproc`
-find .. -name '*whl' | xargs pip install  # install all wheels.
-rm -rf *
 # Compile Documentation only.
 cmake .. -DCMAKE_BUILD_TYPE=Debug -DWITH_GPU=OFF -DWITH_MKLDNN=OFF -DWITH_MKLML=OFF -DWITH_DOC=ON
 make -j `nproc` paddle_docs paddle_docs_cn
@@ -35,6 +28,7 @@ TARGET_BRANCH="gh-pages"
 SOURCE_BRANCH="master"
 
 # Clone the repo to output directory
+mkdir output
 git clone $REPO output
 cd output