Fix typo in classification function selection logic to improve code consistency #32031
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Fixes #32030
(previously tagged
#32013)The existing logic has a typo in it, where, for example, it selects a sigmoid classification function if the problem type is "multi_label_classification" or num_labels is 1. The num_labels condition overrides the problem_type condition, so in practice, I don't think this error will cause a bug, but it's confusing.
This fix corrects the problem type conditions.
Please review at your convenience @Narsil