Synthesizing Data Structure Transformations from Input-Output Examples
We present a method for example-guided synthesis of functional programs over recursive data structures. Given a set of input-output examples, our method synthesizes a program in a functional language with higher-order combinators like map and fold. The synthesized program is guaranteed to be the simplest program in the language to fit the examples.
Our approach combines three technical ideas: inductive generalization, deduction, and enumerative search. First, we generalize the input-output examples into hypotheses about the structure of the target program. For each hypothesis, we use deduction to infer new input/output examples for the missing subexpressions. This leads to a new subproblem where the goal is to synthesize expressions within each hypothesis. Since not every hypothesis can be realized into a program that fits the examples, we use a combination of best-first enumeration and deduction to search for a hypothesis that meets our needs.
We have implemented our method in a tool called Lambda^2, and we evaluate this tool on a large set of synthesis problems involving lists, trees, and nested data structures. The experiments demonstrate the scalability and broad scope of Lambda^2. A highlight is the synthesis of a program believed to be the world’s earliest functional pearl.
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09:15 - 10:55 | Synthesis IResearch Papers at PLDI Main RED (Portland 256) Chair(s): Kathleen FisherTufts University | ||
09:15 25mTalk | Efficient Synthesis of Network Updates Research Papers Jedidiah McClurgUniversity of Colorado Boulder, Hossein HojjatCornell University, Pavol CernyUniversity of Colorado Boulder, Nate FosterCornell University Pre-print Media Attached | ||
09:40 25mTalk | Efficient Synthesis of Probabilistic Programs Research Papers Aditya NoriMicrosoft Research, UK, Sherjil OzairIIT Delhi, Sriram RajamaniMicrosoft Research, Deepak VijaykeerthyMicrosoft Research Media Attached | ||
10:05 25mTalk | FlashRelate: Extracting Relational Data from Semi-Structured Spreadsheets Using Examples Research Papers Dan BarowyUniversity of Massachusetts Amherst, Sumit GulwaniMicrosoft Research, Ted HartMicrosoft Research, Benjamin ZornMicrosoft Research Media Attached | ||
10:30 25mTalk | Synthesizing Data Structure Transformations from Input-Output Examples Research Papers Media Attached |