We can get more than 50 blendshape coefficients from iphoneX, which are distributed in eyes, mouth, check and so on. So I want to know if we can recognize the facial expression/emotions like happy, sad, angry etc. by these blendshapes? Is there a standard or official correspondence between the blendshapes and the facial expression like happy, sad, angry etc. ? I hope someone woule help me to answer these, thanks.