Merge branch 'fix-doc' into 'master'

Fix doc

See merge request open-mmlab/mmaction-lite!205

.gitlab-ci.yml

@@ -48,6 +48,7 @@ pages:
   image: $PYTORCH_IMAGE
   stage: deploy
   script:
+    - pip install mmcv
     - pip install sphinx sphinx_rtd_theme recommonmark sphinx-markdown-tables
     - cd docs
     - ./add_models.sh

docs/api.rst

-API Documentation
-=================
+API Reference
+=============
 
 mmaction.core
 -------------

docs/conf.py

@@ -35,9 +35,8 @@ extensions = [
     'recommonmark', 'sphinx_markdown_tables'
 ]
 
-autodoc_mock_imports = [
-    'mmaction.version', 'torch', 'torchvision', 'cv2', 'mmcv', 'numpy'
-]
+# numpy and torch are required
+autodoc_mock_imports = ['mmaction.version', 'cv2', 'PIL']
 
 # Add any paths that contain templates here, relative to this directory.
 templates_path = ['_templates']