Algorithm 2. Pseudocode of genetic-based extreme gradient boosting (GXGBoost) model.
1.	Initialization
2.	minPopulation = 5;//Minimum population of GA
3.	maxPopulation = 10;//Maximum population of GA
4.	numIterations = 10;//Number of iterations to evaluate GA
5.	minNumEstimators =5, minLearningRate =0.1, lowMaxDepth =2;
6.	maxNumEstimators =50, maxLearningRate =0.4, highMaxDepth =20;
7.	Input
8.	TrainingSet, ValidationSet;
9.	Begin
10.	numPopulation = random.randint (minPopulation, maxPopulation);//Generating random number of population
11.	populationGXGBoost = [];
12.	For i in range (numPopulation):
13.	GXGBoostParameters = random.randint (minNumEstimators, minLearningRate, lowMaxDepth, maxNumEstimators, maxLearningRate, highMaxDepth);//Generating random values of GXGBoost’s parameters
14.	GXGBoostModel = generateGXGBoost (GXGBoostParameters);
15.	populationGXGBoost.append (GXGBoostModel);
16.	End for i
17.	maxAccuracy = 0;
18.	best_model = None;
19.	populationValidationAccuracy = [];
20.	For i in range (numIterations):
21.	For j in range (numPopulation):
22.	GXGBoostModel = populationGXGBoost [j];//Evaluating population
23.	validationAccuracy = evaluateGXGBoost (GXGBoostModel, TrainingSet, ValidationSet);
24.	populationValidationAccuracy.append (validationAccuracy);
25.	If validationAccuracy > maxAccuracy:
26.	maxAccuracy = validationAccuracy;
27.	bestModel = GXGBoostModel;
28.	End if
29.	End for
	//Creating the new generations from the current best GXGBoostModel
30.	For popIndex in range (numPopulation):
31.	model_1 = populationGXGBoost [popIndex];
32.	model_1ValidationAccuracy = populationValidationAccuracy [popIndex];
33.	model_2 = bestModel;
34.	model_2ValidationAccuracy = maxAccuracy;
	//Creating the new generations with crossovers
35.	newModel = crossoverGXGBoost (model_1, model_1ValidationAccuracy, model_2, model_2ValidationAccuracy);
36.	mutateGXGBoost (newModel);//Mutating the new generations
37.	populationGXGBoost [popIndex] = newModel;//Replace current model
38.	End for
39.	End for
40.	Return bestModel, maxAccuracy;
41.	End