How to evaluate XGBoost model with learning curves example 2?
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How to evaluate XGBoost model with learning curves example 2?

How to evaluate XGBoost model with learning curves example 2?

This recipe helps you evaluate XGBoost model with learning curves example 2

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In [2]:
## How to evaluate XGBoost model with learning curves - source MLM
def Snippet_189():
    print()
    print(format('Hoe to visualise XGBoost model with learning curves','*^82'))
    import warnings
    warnings.filterwarnings("ignore")

    # load libraries
    from numpy import loadtxt
    from xgboost import XGBClassifier
    from sklearn.model_selection import train_test_split
    from sklearn.metrics import accuracy_score
    from matplotlib import pyplot
    import matplotlib.pyplot as plt

    plt.style.use('ggplot')

    # load data
    dataset = loadtxt('pima.indians.diabetes.data.csv', delimiter=",")

    # split data into X and y
    X = dataset[:,0:8]
    Y = dataset[:,8]

    # split data into train and test sets
    X_train, X_test, y_train, y_test = train_test_split(X, Y, test_size=0.33, random_state=7)

    # fit model no training data
    model = XGBClassifier()
    eval_set = [(X_train, y_train), (X_test, y_test)]
    model.fit(X_train, y_train, eval_metric=["error", "logloss"], eval_set=eval_set, verbose=False)

    # make predictions for test data
    y_pred = model.predict(X_test)
    predictions = [round(value) for value in y_pred]

    # evaluate predictions
    accuracy = accuracy_score(y_test, predictions)
    print("Accuracy: %.2f%%" % (accuracy * 100.0))

    # retrieve performance metrics
    results = model.evals_result()
    epochs = len(results['validation_0']['error'])
    x_axis = range(0, epochs)

    # plot log loss
    fig, ax = pyplot.subplots(figsize=(12,12))
    ax.plot(x_axis, results['validation_0']['logloss'], label='Train')
    ax.plot(x_axis, results['validation_1']['logloss'], label='Test')
    ax.legend()
    pyplot.ylabel('Log Loss')
    pyplot.title('XGBoost Log Loss')
    pyplot.show()

    # plot classification error
    fig, ax = pyplot.subplots(figsize=(12,12))
    ax.plot(x_axis, results['validation_0']['error'], label='Train')
    ax.plot(x_axis, results['validation_1']['error'], label='Test')
    ax.legend()
    pyplot.ylabel('Classification Error')
    pyplot.title('XGBoost Classification Error')
    pyplot.show()

Snippet_189()
***************Hoe to visualise XGBoost model with learning curves****************
Accuracy: 77.95%

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