Tue 16 Jun 2015 10:30 - 10:55 at PLDI Main RED (Portland 256) - Synthesis I Chair(s): Kathleen Fisher

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.

Tue 16 Jun

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09:15 - 10:55
Synthesis IResearch Papers at PLDI Main RED (Portland 256)
Chair(s): Kathleen Fisher Tufts University
09:15
25m
Talk
Efficient Synthesis of Network Updates
Research Papers
Jedidiah McClurg University of Colorado Boulder, Hossein Hojjat Cornell University, Pavol Cerny University of Colorado Boulder, Nate Foster Cornell University
Pre-print Media Attached
09:40
25m
Talk
Efficient Synthesis of Probabilistic Programs
Research Papers
Aditya Nori Microsoft Research, UK, Sherjil Ozair IIT Delhi, Sriram Rajamani Microsoft Research, Deepak Vijaykeerthy Microsoft Research
Media Attached
10:05
25m
Talk
FlashRelate: Extracting Relational Data from Semi-Structured Spreadsheets Using Examples
Research Papers
Dan Barowy University of Massachusetts Amherst, Sumit Gulwani Microsoft Research, Ted Hart Microsoft Research, Benjamin Zorn Microsoft Research
Media Attached
10:30
25m
Talk
Synthesizing Data Structure Transformations from Input-Output Examples
Research Papers
John Feser Rice University, Swarat Chaudhuri Rice University, Isil Dillig University of Texas, Austin
Media Attached