I imagine a keyword decomposition would work very well with a pathologists' report too - essentially using the biological feature-names as "tags" on the image would eventually allow a program to correlate an image of that feature with a name much faster than a general "good v bad" fitness function.

If this is how it works, it's a shame this isn't made clearer in the texts. You could get someone to tag images whimsically but consistently, rather than go the whole trouble of writing poetry.