Min objective and function evaluations

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Salad Box
Salad Box on 15 Jan 2019
Answered: Don Mathis on 16 Jan 2019
As I was learning to optimize regression tree, I'm struggling to understand some of the codes and graphs generated in the matlab example ' Optimize Regression Tree'
load carsmall
X = [Weight,Horsepower];
Y = MPG;
rng default
Mdl = fitrtree(X,Y,'OptimizeHyperparameters','auto',...
'HyperparameterOptimizationOptions',struct('AcquisitionFunctionName',...
'expected-improvement-plus'))
As you can see from the above code, they set the 'OptimizeHyperparameters' to 'auto', they struct 'AcquisitionFunctionName' to 'expected-improvement-plus', they also put 'HyperparameterOptimizationOptions' in the bracket.
My first question is that i'm not familiar with all the parameters I could put here, is there a list of those parameters out there for me to familiarize with all the properties I could put in the bracket?
Once you type the above code, the outputs are two graphs shown below.
OptimizeARegressionTreeExample_01.png
OptimizeARegressionTreeExample_02.png
My second question is that in the first graph, what does 'Min objective' mean? What does 'Number of function Evaluations' mean?

Answers (1)

Don Mathis
Don Mathis on 16 Jan 2019
Question 2: As mentioned in the link for Question 1, it's using the 'bayesopt' function. Start here: https://www.mathworks.com/help/stats/bayesopt.html

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