Another new feature coming in Pennyworth is the ability to rename or delete labels you have applied to training examples:

This interface is located in the Preferences and can be used to correct misspellings, merge labels, or delete irrelevant training cases. The way that it works is that it creates an operation (delete or rename) and applies that operation to the appropriate machine learner.

In deletion cases, the examples labeled the same as the one specified are simply deleted from the training cases and the learner generates a new model. In the renaming operation, matching cases have their labels replaced with the new one and the learner generates a new model.

I’m hoping to finish testing this release in the next few days and do a proper release this weekend.