SCG News

Hyperparameter Optimization to Improve the Accuracy of Predicting the Number of Bugs

Haidar Osman, Mohammad Ghafari, and Oscar Nierstrasz. Hyperparameter Optimization to Improve the Accuracy of Predicting the Number of Bugs. Submitted to MaLTeSQuE 2017: International Workshop on Machine Learning Techniques for Software Quality Evaluation. Details.

Posted by scg at 12 January 2017, 11:15 am comment link

Hyperparameter Optimization to Improve the Accuracy of Predicting the Number of Bugs

Haidar Osman, Mohammad Ghafari, and Oscar Nierstrasz. Hyperparameter Optimization to Improve the Accuracy of Predicting the Number of Bugs. Submitted to MaLTeSQuE 2017: International Workshop on Machine Learning Techniques for Software Quality Evaluation. Details.

Posted by scg at 2 January 2017, 12:15 pm comment link

NullSpy — An approach to pinpoint the origin location of a null reference

Lina Tran. NullSpy — An approach to pinpoint the origin location of a null reference. Bachelor’s thesis, University of Bern, December 2016. Details.

Abstract

A previous study found that null pointer exceptions are the most frequently occurring exceptions in Java projects. Also, it is difficult to debug because a developer is only provided with a stack trace to the line of code where the exception was thrown. This only gives insight into the effect of the fault but not into its cause. The aim of the project is to provide the developer with an additional stack trace. It shows the location where the variable that caused the null pointer exception was initially assigned to null. We attempt to achieve this goal by instrumenting Java source code while striving for minimal execution overhead. By tracking the null assignments through static analysis and bytecode instrumentation we can achieve a more efficient debugging process after an occurrence of a null pointer exception.

Posted by scg at 20 December 2016, 3:15 pm comment link

Exploring Cheap Type Inference Heuristics in Dynamically Typed Languages

Nevena Milojković and Oscar Nierstrasz. Exploring Cheap Type Inference Heuristics in Dynamically Typed Languages. In Proceedings of the 2016 ACM International Symposium on New Ideas, New Paradigms, and Reflections on Programming and Software, Onward! 2016, p. 43—56, ACM, New York, NY, USA, 2016. Details.

Abstract

Although dynamically typed languages allow developers to be more productive in writing source code, their lack of information about types of variables is one of the main obstacles during program comprehension. Static type information helps developers to decrease software maintenance time. Inferring the types of variables requires complex algorithms in order to avoid false positives or negatives. Their main aim is to shorten the list of possible types for a variable. We have developed a couple of cheap heuristics that use easily accessible information about the presence of each class in the available source code to promote the correct type towards the top of the list of possible types for a variable. Our evaluation of a proof-of-concept prototype, implemented in Pharo Smalltalk, shows that both for domain- specific types and standard libraries these heuristics tend to work well. The evaluated heuristics prove to be reasonably precise, promoting the correct types of a variable towards the top of the list in 50.67% up to 89.09% of cases on average, depending on the applied heuristic. The heuristic that has proven to be the best was compared with one existing type inference algorithm and the best heuristic yields significantly better results with less effort.

Posted by scg at 1 December 2016, 10:15 am comment link

Engineering Academic Software (Dagstuhl Perspectives Workshop 16252)

Carol Goble, James Howison, Claude Kirchner, Oscar Nierstrasz, and Jurgen J. Vinju. Engineering Academic Software (Dagstuhl Perspectives Workshop 16252). In Dagstuhl Reports 6(6) p. 62—87, 2016. Details.

Abstract

This report documents the program and the outcomes of Dagstuhl Perspectives Workshop 16252 “Engineering Academic Software”.

Posted by scg at 18 November 2016, 10:15 am comment link
<< 1 2 3 4 5 6 7 8 9 10 >>
Last changed by scg on 17 August 2016