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Performance of individual Gradient Boosted Trees

Dear Community,

I have executed the GBT tutorial process and could see that an overall Performance Vector was generated. I assume that the underlying performance values are representative for the sum of the ten GBTs which were generated, right?

Is there a possbility to see the performance development of the intermediate steps or does the algorithm "only" calculates an overall score? So probably, what is the performance of Tree 5?

Image: https://us.v-cdn.net/6030995/uploads/editor/l7/ss370fi6f5gk.jpg

Best regards

Fatih

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MartinLiebig

Hi Fatih,

i think there is a bit of a misconception. Those trees are not parallel to one another but depend on the proceeding ones. If you want to use a subset of the trees, you would need to evaluate the first 1-k trees compared to the first 1-k+m trees. I don't see a reason to evaluate trees individually.

ABoth things are afaik not easily doable.

Best,

Martin

Muhammed_Fatih_

Hi @mschmitz,

thank you for your answer!

Does this mean that the Performance Vector calculates the values for the last (in this case:10th) Decision Tree which is sequentially optimised?

Best regards!

Fatih

MartinLiebig

Hi,

maybe have a look at this kb article: https://community.rapidminer.com/discussion/51258/a-practical-guide-to-gradient-boosted-trees-part-i-regression this should help. Happy to help for further questions.

Best,

Martin