Depends what you&#x27;re tuning. If it&#x27;s something like the number of trees in a random forest, definitely do that automatically. If it&#x27;s the number of clusters in a clustering problem, that&#x27;s where you&#x27;d be asking an expert something like &quot;how many distinct groups of customers do you think we should try to split them into?&quot; and go from there. But even in that scenario, the expert&#x27;s opinion might just be your starting point for automatic tuning.