Add ci and code format checking.

.clang-format

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+# This file is used by clang-format to autoformat paddle source code
+#
+# The clang-format is part of llvm toolchain.
+# It need to install llvm and clang to format source code style.
+#
+# The basic usage is,
+#   clang-format -i -style=file PATH/TO/SOURCE/CODE
+#
+# The -style=file implicit use ".clang-format" file located in one of
+# parent directory.
+# The -i means inplace change.
+#
+# The document of clang-format is
+#   http://clang.llvm.org/docs/ClangFormat.html
+#   http://clang.llvm.org/docs/ClangFormatStyleOptions.html
+---
+Language:        Cpp
+BasedOnStyle:  Google
+IndentWidth:     2
+TabWidth:        2
+ContinuationIndentWidth: 4
+MaxEmptyLinesToKeep: 2
+AccessModifierOffset: -2  # The private/protected/public has no indent in class
+Standard:  Cpp11
+AllowAllParametersOfDeclarationOnNextLine: true
+BinPackParameters: false
+BinPackArguments: false
+...
+

.clang_format.hook

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+#!/usr/bin/env bash
+set -e
+
+readonly VERSION="3.8"
+
+version=$(clang-format -version)
+
+if ! [[ $version == *"$VERSION"* ]]; then
+    echo "clang-format version check failed."
+    echo "a version contains '$VERSION' is needed, but get '$version'"
+    echo "you can install the right version, and make an soft-link to '\$PATH' env"
+    exit -1
+fi
+
+clang-format $@

.gitignore

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+.DS_Store
+*.pyc

.pre-commit-config.yaml

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+-   repo: https://github.com/pre-commit/mirrors-yapf.git
+    sha: v0.16.0
+    hooks:
+    -   id: yapf
+        files: \.py$
+-   repo: https://github.com/pre-commit/pre-commit-hooks
+    sha: a11d9314b22d8f8c7556443875b731ef05965464
+    hooks:
+    -   id: check-merge-conflict
+    -   id: check-symlinks
+    -   id: detect-private-key
+        files: (?!.*paddle)^.*$
+    -   id: end-of-file-fixer
+        files: \.md$
+    -   id: trailing-whitespace
+        files: \.md$
+-   repo: https://github.com/Lucas-C/pre-commit-hooks
+    sha: v1.0.1
+    hooks:
+    -   id: forbid-crlf
+        files: \.md$
+    -   id: remove-crlf
+        files: \.md$
+    -   id: forbid-tabs
+        files: \.md$
+    -   id: remove-tabs
+        files: \.md$
+-   repo: local
+    hooks:
+    -   id: clang-format
+        name: clang-format
+        description: Format files with ClangFormat
+        entry: bash .clang_format.hook -i
+        language: system
+        files: \.(c|cc|cxx|cpp|cu|h|hpp|hxx|cuh|proto)$
+-   repo: local
+    hooks:
+    -   id: convert-markdown-into-html
+        name: convert-markdown-into-html
+        description: Convert README.md into index.html
+        entry: python .pre-commit-hooks/convert_markdown_into_html.py
+        language: system
+        files: .+README\.md$

.style.yapf

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+[style]
+based_on_style = pep8
+column_limit = 80

.travis.yml

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+language: cpp
+cache: ccache
+sudo: required
+dist: trusty
+services:
+  - docker
+os:
+  - linux
+env:
+  - JOB=PRE_COMMIT
+
+addons:
+  apt:
+    packages:
+      - git
+      - python
+      - python-pip
+      - python2.7-dev
+  ssh_known_hosts: 52.76.173.135
+before_install:
+  -  sudo pip install -U virtualenv pre-commit pip
+  -  docker pull paddlepaddle/paddle:latest
+script:
+  -  .travis/precommit.sh
+  -  docker run -i --rm -v "$PWD:/py_unittest" paddlepaddle/paddle:latest /bin/bash -c
+    'cd /py_unittest; sh .travis/unittest.sh'
+  - |
+    if [[ "$TRAVIS_PULL_REQUEST" != "false" ]]; then exit 0; fi;
+    if [[ "$TRAVIS_BRANCH" != "develop"  && ! "$TRAVIS_BRANCH" =~ ^v[[:digit:]]+\.[[:digit:]]+(\.[[:digit:]]+)?(-\S*)?$ ]]; then echo "not develop branch, no deploy"; exit 0; fi;
+    export DEPLOY_DOCS_SH=https://raw.githubusercontent.com/PaddlePaddle/PaddlePaddle.org/master/scripts/deploy/deploy_docs.sh
+    export MODELS_DIR=`pwd`
+    cd ..
+    curl $DEPLOY_DOCS_SH | bash -s $CONTENT_DEC_PASSWD $TRAVIS_BRANCH $MODELS_DIR
+notifications:
+  email:
+    on_success: change
+    on_failure: always

.travis/precommit.sh

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+#!/bin/bash
+function abort(){
+    echo "Your commit not fit PaddlePaddle code style" 1>&2
+    echo "Please use pre-commit scripts to auto-format your code" 1>&2
+    exit 1
+}
+
+trap 'abort' 0
+set -e
+cd `dirname $0`
+cd ..
+export PATH=/usr/bin:$PATH
+pre-commit install
+
+if ! pre-commit run -a ; then
+  ls -lh
+  git diff  --exit-code
+  exit 1
+fi
+
+trap : 0

.travis/unittest.sh

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+#!/bin/bash
+
+abort(){
+    echo "Run unittest failed" 1>&2
+    echo "Please check your code" 1>&2
+    exit 1
+}
+
+unittest(){
+    cd $1 > /dev/null
+    if [ -f "setup.sh" ]; then
+        sh setup.sh
+        export LD_LIBRARY_PATH=/usr/local/lib:$LD_LIBRARY_PATH
+    fi
+    if [ $? != 0 ]; then
+        exit 1
+    fi
+    find . -name 'tests' -type d -print0 | \
+        xargs -0 -I{} -n1 bash -c \
+        'python -m unittest discover -v -s {}'
+    cd - > /dev/null
+}
+
+trap 'abort' 0
+set -e
+
+for proj in */ ; do
+    if [ -d $proj ]; then
+        unittest $proj
+        if [ $? != 0 ]; then
+            exit 1
+        fi
+    fi
+done
+
+trap : 0