* [Doc] Try use image converter instead of svg2pdf which requires more dependencies
* [Doc] Add img converter to conf.py
* [Doc] Bug fix in importing imgconverter package
* [Doc] Try to fix the bug when importing python packages
* [Doc] bug fix
* [Doc] Try to use imgconverter rather than cairo
* [Doc] Add svg to latex config in sphinx configuration file
* [Doc] Try cairo svg converter
* [Doc] Correct bugs in compiling latexpdf
* [Doc] Use latest image in building readthedocs
* [Doc] Now use readthedocs docker image in building online documentation
* [Doc] Correct typo in readthedocs setting
* [Doc] Try to use inkscape converter as imgconverter converted SVG to black images
* [Doc] Try RSVG
tangxifan