How much training data for facial action unit detection?

Jeffrey M. Girard Jeffrey F. Cohn László A. Jeni Simon Lucey Fernando De la Torre How much training data for facial action unit detection? 1-8 2015 FG https://doi.org/10.1109/FG.2015.7163106 https://doi.ieeecomputersociety.org/10.1109/FG.2015.7163106 https://www.wikidata.org/entity/Q31106430 conf/fgr/2015 db/conf/fgr/fg2015.html#GirardCJLT15