Download Behavioral Program Synthesis with Genetic Programming by Krzysztof Krawiec PDF

By Krzysztof Krawiec

Genetic programming (GP) is a well-liked heuristic method of software synthesis with origins in evolutionary computation. during this generate-and-test process, candidate courses are iteratively produced and evaluated. The latter comprises working courses on exams, the place they show advanced behaviors mirrored in alterations of variables, registers, or reminiscence. That habit not just finally determines application output, yet can also demonstrate its `hidden traits' and critical features of the thought of synthesis challenge. notwithstanding, the traditional GP is oblivious to such a lot of that info and typically cares merely concerning the variety of exams glided by a application. This `evaluation bottleneck' leaves seek set of rules underinformed in regards to the genuine and strength traits of candidate programs.

This e-book proposes behavioral software synthesis, a conceptual framework that opens GP to distinct details on application habit so that it will make application synthesis extra effective. numerous present and novel mechanisms subscribing to that standpoint to various quantity are provided and mentioned, together with implicit health sharing, semantic GP, co-solvability, hint convergence research, pattern-guided application synthesis, and behavioral files of subprograms. The framework comprises numerous innovations which are new to GP, together with execution list, mixed hint, and seek motive force, a generalization of aim functionality. Empirical proof collected in numerous offered experiments in actual fact demonstrates the usefulness of behavioral strategy. The e-book comprises additionally an in depth dialogue of implications of the behavioral standpoint for application synthesis and beyond.

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Extra resources for Behavioral Program Synthesis with Genetic Programming

Example text

See [82] for the complete figure. In Fig. 4, we present an analogous graph for the much harder par3 problem, where a correct program should return true if and only if the number of input variables that have the value true is even. The graph, generated using the same instruction set and identical settings as for mux3, features a substantially different structure of arcs. The log-odds of the orders between 1 and 2 occur already one layer lower than for mux3. In the second layer from the top, all nodes are marked by ∞ and all the outgoing arrows point downwards: no program with these outcomes vectors in the considered sample underwent an improving mutation.

A generate-and-test program synthesis method like GP will usually start with the programs occupying middle levels in the lattice, and progress toward the top node. Any program interacting with the tests in T can be unambiguously assigned to one and only one node in this lattice based on its outcome vector. Multiple programs may occupy the same node in the lattice due to the mapping from programs to their behaviors being many-to-one (Sect. 4). For most programming languages P, some behaviors of programs in P are more common than others.

Consider a hypothetical task with such a transition graph shown in Fig. 2a. The arrows mark the possibility of transitions between outcome vectors. 2 Consequences of evaluation bottleneck 27 vector 010 such that it can2 be modified by the considered search operator so that its outcome vector changes to 110. Note that in general one should not expect the arrows to be mirrored: a search operator may be unable to revert the effects of its application. It does not take long to realize that the problem shown in Fig.

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