课程: Machine Learning and AI Foundations: Decision Trees with KNIME

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When to turn off pruning

When to turn off pruning - KNIME教程

课程: Machine Learning and AI Foundations: Decision Trees with KNIME

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When to turn off pruning

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- [Instructor] Okay, we are in the same workflow. We've built our model, we've checked its accuracy. On one level, we're all done. But I want to talk about the effects of turning off pruning and actually demonstrate that. So let's take a look. So we go in and we have an opportunity to deselect Reduced Error Pruning. We're going to keep it on for just a little bit longer. I also want to mention that reduced error pruning is the type of pruning and C4.5. Classification trees has a different kind of pruning called cost complexity pruning. We're going to talk only about this kind, because it's supported in decision tree learner. We won't be demonstrating cost complexity pruning, 'cause it's not supported in the decision tree learner. So let's click on OK. And it's just reminding us that the settings weren't changed. That's fine, 'cause we're going to do a little exercise here. We're going to take a look at the decision tree,…

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