Merge branch 'add-ci-docs-gen' into 'master'

Add docs build in CI

See merge request !470

.gitlab-ci.yml

 stages:
   - cpplint
   - pycodestyle
+  - docs
   - platform_compitable_tests
   - ops_test
   - api_test
@@ -18,6 +19,23 @@ pycodestyle:
   script:
     - pycodestyle $(find -name "*.py")
 
+docs:
+  stage: docs
+  script:
+    - cd docs
+    - make html
+    - CI_LATEST_OUTPUT_PATH=/mace-build-output/$CI_PROJECT_NAME/latest
+    - CI_JOB_OUTPUT_PATH=/mace-build-output/$CI_PROJECT_NAME/$CI_BUILD_ID
+    - mkdir -p $CI_JOB_OUTPUT_PATH
+    - cp -r _build/html $CI_JOB_OUTPUT_PATH/docs
+    - rm -rf $CI_LATEST_OUTPUT_PATH
+    - mkdir -p $CI_LATEST_OUTPUT_PATH
+    - cp -r _build/html $CI_LATEST_OUTPUT_PATH/docs
+
+  artifacts:
+    paths:
+      - docs/_build
+
 ops_test:
   stage: ops_test
   script:

docker/Dockerfile

@@ -116,7 +116,11 @@ RUN pip install -i http://pypi.douban.com/simple/ --trusted-host pypi.douban.com
     pyyaml \
     sh==1.12.14 \
     pycodestyle==2.4.0 \
-    filelock
+    filelock \
+    sphinx \
+    sphinx-autobuild \
+    sphinx_rtd_theme \
+    recommonmark
 
 # Download tensorflow tools
 RUN wget https://cnbj1.fds.api.xiaomi.com/mace/tools/transform_graph && \