https://en.wikipedia.org/wiki/Energy_functional
https://stackoverflow.com/questions/50342526/what-is-the-difference-between-energy-function-and-loss-function
objective function
cost function
loss function
https://en.wikipedia.org/wiki/Loss_function
likelihood function
In statistics, the likelihood function (often simply called likelihood) expresses how likely particular values of statistical parameters are for a given set of observations.
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