Can we derive formulas from neural networks or decision trees?

(updated on June 10, 2020)

I was wondering if we could derive numerical relationships between input variables and output variables from nonlinear model structures such neural networks and decision trees. I find a Q&A on ResearchGate, and I like the answer.

One answer wrote: "It is possible to obtain an equation after developing an ANN for prediction. in fact, you will end up with a long equation including the inputs, weights, biases, etc."

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