Method to exclude a class

[abfleishman]

Sometimes there are images that have an example of a class in them that is not a good image to train on (the object is not typical, or partially obscured, or blurry). It would be nice to have a mechanism to easily exclude images with a specific tag or text string (bad, exclude, *_blurry, *_bad).

In VoTT the only option is to tag something, or no, so in terms of creating a labeled dataset, it is important to label everything in the dataset, so it would be nice to have the exclusion mechanism in the active learning side.