Rename Metadata num_classes to be more clear #5461
Merged
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A recent completed PR (#5299) created a new Metadata method num_classes(), but this can be confused with the actual num_classes in a Dataset. It should definitely be the same number, but the new method is specifically returning the num_classes as configured and allocated in Metadata. Reviewers requested to rename this method to be clearer. New name is num_init_score_classes().