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* Define `best_iteration` only if early stopping is used. This is the behavior specified by the document but not honored in the actual code. - Don't set the attributes if there's no early stopping. - Clean up the code for callbacks, and replace assertions with proper exceptions. - Assign the attributes when early stopping `save_best` is used. - Turn the attributes into Python properties. --------- Co-authored-by: Philip Hyunsu Cho <chohyu01@cs.washington.edu>
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