La curva ROC

Ora che hai costruito un modello di regressione logistica per prevedere lo stato di diabete, puoi tracciare la curva ROC per visualizzare come variano il tasso di veri positivi e di falsi positivi al variare della soglia decisionale.

Le etichette di prova, y_test, e le probabilità previste delle caratteristiche di prova appartenenti alla classe positiva, y_pred_probs, sono state precaricate per te, insieme a matplotlib.pyplot e plt.

Creerai una curva ROC e poi interpreterai i risultati.

Questo esercizio fa parte del corso

Apprendimento supervisionato con scikit-learn

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Esercizio pratico interattivo

Prova a risolvere questo esercizio completando il codice di esempio.

# Import roc_curve
____

# Generate ROC curve values: fpr, tpr, thresholds
fpr, tpr, thresholds = ____(____, ____)

plt.plot([0, 1], [0, 1], 'k--')

# Plot tpr against fpr
plt.plot(____, ____)
plt.xlabel('False Positive Rate')
plt.ylabel('True Positive Rate')
plt.title('ROC Curve for Diabetes Prediction')
plt.show()

Modifica ed esegui il codice

Questo esercizio fa parte del corso

Apprendimento supervisionato con scikit-learn

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In this chapter, you'll be introduced to classification problems and learn how to solve them using supervised learning techniques. You'll learn how to split data into training and test sets, fit a model, make predictions, and evaluate accuracy. You’ll discover the relationship between model complexity and performance, applying what you learn to a churn dataset, where you will classify the churn status of a telecom company's customers.

Exercise 1: Machine learning with scikit-learn Exercise 2: Binary classification Exercise 3: The supervised learning workflow Exercise 4: The classification challenge Exercise 5: k-Nearest Neighbors: Fit Exercise 6: k-Nearest Neighbors: Predict Exercise 7: Measuring model performance Exercise 8: Train/test split + computing accuracy Exercise 9: Overfitting and underfitting Exercise 10: Visualizing model complexity

In this chapter, you will be introduced to regression, and build models to predict sales values using a dataset on advertising expenditure. You will learn about the mechanics of linear regression and common performance metrics such as R-squared and root mean squared error. You will perform k-fold cross-validation, and apply regularization to regression models to reduce the risk of overfitting.

Exercise 1: Introduction to regression Exercise 2: Creating features Exercise 3: Building a linear regression model Exercise 4: Visualizing a linear regression model Exercise 5: The basics of linear regression Exercise 6: Fit and predict for regression Exercise 7: Regression performance Exercise 8: Cross-validation Exercise 9: Cross-validation for R-squared Exercise 10: Analyzing cross-validation metrics Exercise 11: Regularized regression Exercise 12: Regularized regression: Ridge Exercise 13: Lasso regression for feature importance

Having trained models, now you will learn how to evaluate them. In this chapter, you will be introduced to several metrics along with a visualization technique for analyzing classification model performance using scikit-learn. You will also learn how to optimize classification and regression models through the use of hyperparameter tuning.

Exercise 1: Quanto è bello il tuo modello?Exercise 2: Decidere una metrica primaria Exercise 3: Valutazione di un classificatore di previsione del diabete Exercise 4: Regressione logistica e curva ROC Exercise 5: Costruire un modello di regressione logistica Exercise 6: La curva ROC

Esercizio in corso

Exercise 7: ROC AUC Exercise 8: Regolazione dell'iperparametro Exercise 9: Regolazione degli iperparametri con GridSearchCV Exercise 10: Sintonizzazione degli iperparametri con RandomizedSearchCV

Learn how to impute missing values, convert categorical data to numeric values, scale data, evaluate multiple supervised learning models simultaneously, and build pipelines to streamline your workflow!

Exercise 1: Preprocessing data Exercise 2: Creating dummy variables Exercise 3: Regression with categorical features Exercise 4: Handling missing data Exercise 5: Dropping missing data Exercise 6: Pipeline for song genre prediction: I Exercise 7: Pipeline for song genre prediction: II Exercise 8: Centering and scaling Exercise 9: Centering and scaling for regression Exercise 10: Centering and scaling for classification Exercise 11: Evaluating multiple models Exercise 12: Visualizing regression model performance Exercise 13: Predicting on the test set Exercise 14: Visualizing classification model performance Exercise 15: Pipeline for predicting song popularity Exercise 16: Congratulations