Correction to: Nature Machine Intelligence https://doi.org/10.1038/s42256-019-0068-6, published online 9 July 2019.

In the version of this Article originally published, in the Code availability section the URL for the feature activation map (FAM) generation capsule was incorrect as https://doi.org/10.24433/CO.3573560.v2; it should have been https://doi.org/10.24433/CO.7749421.v1. This has now been corrected.