Note that the rename method was called after we wrote the `json` hierarchy and thus only the `lgroups.gmt` contain the proper names while the other are annotated with the indernal index values. Cluster names are deduced by the index values joined by a `.`. If you look in the `gmt` file with a text editor you will see that the first column contains the `child` cluster and the second columns first entry contains the `parent` cluster name (it is also followed by more information joined in with a `:`).
Note that the rename method was called after we wrote the `json` hierarchy and thus only the `lgroups.gmt` contain the proper names while the other are annotated with the internal index values. Cluster names are deduced by the index values joined by a `.`. If you look in the `gmt` file with a text editor you will see that the first column contains the `child` cluster and the second columns first entry contains the `parent` cluster name (it is also followed by more information joined in with a `:`). The field delimiter for `gmt` file fields is a tab delimiter.
See also solution with less dependencies in the [graphtastic](https://github.com/richardtjornhammar/graphtastic) library
