use child codes as parent in classifier#688
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Adds the option (during first step of span classifier wizard) to merge child codes into parents.
This changes both the dataset statistics (shown before training) as well as the actual training data.
Given a code hierarchy like
and selecting a & b as codes, this will treat a1,a2,a11 as a, and b1,b2 as b. Thus, more fine-grained codes can be used for their coarse-grained parent codes recursively.
As child codes spans might overlap, only distinct spans (after in-place conversion to parent code) are counted for the dataset statistic. This fits the IO/BIO tagging scheme of the classifier, that can only output a single code per token.
If 'merge child codes into parents' is not used, behavior is as before.