a51fb975227d6640e4fe47854476d133-Supplemental.pdf

According to FACS, given an expression, AUs can be grouped into primary(P) and secondary(S) categories. Given a specific expression, the probability for its primary AU to be present is higher than it's absence. We include the reported probabilities under 6 basic expressions as another source of the generic knowledge. We formulate the probabilities by considering the pairwise positive correlation for each pair of AUs (Xaui,Xauj) within a AU combination. The dependencies are further divided into positive correlations and negative correlations.