That's a pretty bold claim.
There's uncountable inputs. It's like trying to accurately predict the weather - chaos theory or something. Emotions are "essentially" gas exchange, but the areas and rate or whatever are not standardized across humans.
I have neither experienced or observed anything about human emotions that indicates they are in any way chaotic, random or unexplainable. We have beliefs, memories and experiences. emotions always use these variables and produce some output. Not only are emotions deterministic, but they are used by any number of people, from spies, to advertisers, to state-level disinformation propagandists to manipulate large numbers of peoples reliably.
Famously, human experience is quite subjective (gestures broadly at 3 millenniums worth of philosophy), so I don't believe your individual experience means much here.
So is your claim that 100% of all human emotions are deterministic? That's quite a bold claim don't you think?
i never said emotions were inputs. The gas exchange and the resulting reaction or "thoughts" or "emotions" have uncountable inputs. Some people don't have the ability to "put themselves in someone else's shoes", some people do. Some people can see pictures in their "mind's eye" and some can't.
I don't think we're talking about the same thing, based on your last sentence.