One could probably train a model with the 
Facial Action Coding System to be able to decode emotions based on facial expressions.

One could probably train a model with the 
Facial Action Coding System to be able to decode emotions based on facial expressions.


https://en.m.wikipedia.org/wiki/Facial_Action_Coding_System

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I would treat it like any other language.
You need a good training sample across cultures for it to work globally.
It'll also need to learn to tell when something is fake.

We're still struggling on these things for LLMs

Interesting! But given that a poker face or cultural nuances exist, how reliable do you think an AI's emotion read would be across the board? 🤖🤨🤔