---
category: academic
type: academic
person: Yanxin Lu
date: 2015-04
source: engi600_2015.pptx
---

# ENGI 600: Data-Driven Program Repair

Yanxin Lu, Swarat Chaudhuri, Christopher Jermaine, Joe Warren, and Scott Rixner. 12 slides.

## Slide 1: Title
Data-Driven Program Repair

## Slide 2: Debugging is difficult

## Slide 3: Related work
- Talus, tutoring system (Murray, 1986) — reference program, program analysis
- Mutation (Debroy and Wong, 2010) — predefined rules for mutating programs

## Slide 4: Data-driven program repair
- Code database for evaluatePoly
- Incorrect Program → Correct Program

## Slide 5: EvaluatePoly
- A program which evaluates polynomials
- Poly: a list of coefficients
- X: the x value in the polynomial

## Slide 6: Similar and correct implementations
- Distance between programs
- Incorrect Program → Code Database → Correct Programs → Template Generation

## Slide 7: Template Generation
- Find differences and replace them with holes
- Ignore variable names

## Slide 8: Filling in the Holes
- Search for ways to replace holes
- Variable Renaming

## Slide 9: Variable Renaming
- Rename variables in the good program

## Slide 10: Unit Testing
- Filter all incorrect fixes using unit testing
- If multiple correct fixes, choose the most similar one

## Slide 11: Experiment

## Slide 12: Conclusion
- Data-driven program repair
- Effective in fixing small incorrect programs
- Computer science education — same mistakes