Regressieprestatie

Nu je een model, reg, hebt getraind met alle features uit sales_df en voorspellingen van verkoopwaarden hebt gemaakt, kun je de prestatie evalueren met een paar veelgebruikte regressiemetingen.

De variabelen X_train, X_test, y_train, y_test en y_pred, samen met het getrainde model reg, allemaal uit de vorige oefening, zijn alvast voor je geladen.

Jouw taak is om te bepalen hoe goed de features de variantie in de doelwaarden kunnen verklaren en om het vermogen van het model te beoordelen om voorspellingen te doen op niet eerder geziene data.

Deze oefening maakt deel uit van de cursus

Supervised Learning met scikit-learn

Cursus bekijken

Oefeninstructies

Importeer root_mean_squared_error.
Bereken de R-squared-score van het model door de test-featurewaarden en de test-doelwaarden door te geven aan een geschikte methode.
Bereken de root mean squared error van het model met y_test en y_pred.
Print r_squared en rmse.

Praktische interactieve oefening

Probeer deze oefening eens door deze voorbeeldcode in te vullen.

# Import root_mean_squared_error
from ____.____ import ____

# Compute R-squared
r_squared = reg.____(____, ____)

# Compute RMSE
rmse = ____(____, ____)

# Print the metrics
print("R^2: {}".format(____))
print("RMSE: {}".format(____))

Code bewerken en uitvoeren

Deze oefening maakt deel uit van de cursus

Supervised Learning met scikit-learn

SkillTag.level.intermediateSkillTag.label

4.8+

Begin de cursus gratis

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: Introductie tot regressie Exercise 2: Features maken Exercise 3: Een lineair regressiemodel bouwen Exercise 4: Een lineair regressiemodel visualiseren Exercise 5: De basis van lineaire regressie Exercise 6: Fitten en voorspellen voor regressie Exercise 7: Regressieprestatie

Huidige oefening

Exercise 8: Cross-validatie Exercise 9: Cross-validation voor R-squared Exercise 10: Cross-validation-metrics analyseren Exercise 11: Geregulariseerde regressie Exercise 12: Geregulariseerde regressie: Ridge Exercise 13: Lasso-regressie voor 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: How good is your model?Exercise 2: Deciding on a primary metric Exercise 3: Assessing a diabetes prediction classifier Exercise 4: Logistic regression and the ROC curve Exercise 5: Building a logistic regression model Exercise 6: The ROC curve Exercise 7: ROC AUC Exercise 8: Hyperparameter tuning Exercise 9: Hyperparameter tuning with GridSearchCV Exercise 10: Hyperparameter tuning with 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