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> In most real world scenarios there is no canonical objective function

How does this claim mesh with this quote from the paper: """Stoke (Schkufza et al., 2013) performs black-box optimization of a cost function on the space of programs, represented as a series of instructions. Each instruction is composed of an opcode, specifying what to execute, and some operands, specifying the corresponding registers. Each given input program T defines a cost function. For a candidate program R called rewrite, the goal is to optimize the following cost function"""

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