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Showing posts from December, 2017

To pin or not to pin dependencies: reproducible vs. reusable software

We recently had a very interesting conversation in our lab about how to describe software dependencies (libraries one needs to install) for a software project in the context of research. One camp was proposing explicitly listing which version of a dependency is required (a scheme also referred to "pinning") and the other camp was more in favor of either not specifying version at all or specifying the minimal required version. Luckily both camps agreed on the importance of specifying dependencies, but what's the big deal about pinning vs not pinning?

Advantages of pinning dependencies When you pin a dependency (for example by saying "numpy==1.1.3") you explicitly point to a version of a library that a) you know works with your script b) was used to generate the result you present in your paper. This is very useful for people trying to replicate your results using your code as well as yourself attempting to revisit a project that was put aside for a while (for e…