This seems a bit circular.
The universe (U) itself would be the prediction machine.
To be fair, there would be no definition of "circular" without the universe.
The reality we - or habitants from other universes or other domensions - can measure seems to be some kind of "Fractal collapsing" at the dimension/universe that the "measurer" is located.
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Kind of related:
Dostoiévsk, in his book notes from underground proposes an interesting problem.
I paraphrase it below:
What would you do if you receive from god himself a manuscript of the actions (down to the minimum possible dt) that will maximize your "satisfaction function" considering all your life?
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Rick and Morty also explored this using another analogy:
Psychologists are like horses in a caroussel trying to understand it's mechanism. They'll do their best, but in the end won't help much and feel terrified.