Regularized regression: Ridge

Ridge regression melakukan regularisasi dengan menghitung nilai parameter model yang dipangkatkan dua lalu dikalikan alpha dan menambahkannya ke fungsi rugi.

Dalam latihan ini, Anda akan memasangkan model ridge regression pada berbagai nilai alpha yang berbeda, dan mencetak skor \(R^2\)-nya. Anda akan menggunakan semua fitur dalam himpunan data sales_df untuk memprediksi "sales". Data telah dibagi menjadi X_train, X_test, y_train, y_test untuk Anda.

Sebuah variabel bernama alphas telah disediakan sebagai sebuah list yang berisi berbagai nilai alpha, yang akan Anda iterasikan untuk menghasilkan skor.

Latihan ini adalah bagian dari kursus

Supervised Learning dengan scikit-learn

Petunjuk latihan

Impor Ridge.
Instansiasi Ridge, tetapkan alpha sama dengan alpha.
Latih model pada data pelatihan.
Hitung skor \(R^2\) untuk setiap iterasi ridge.

Latihan interaktif praktis

Cobalah latihan ini dengan menyelesaikan kode contoh berikut.

# Import Ridge
from ____.____ import ____
alphas = [0.1, 1.0, 10.0, 100.0, 1000.0, 10000.0]
ridge_scores = []
for alpha in alphas:
  
  # Create a Ridge regression model
  ridge = ____
  
  # Fit the data
  ____
  
  # Obtain R-squared
  score = ____
  ridge_scores.append(score)
print(ridge_scores)

Edit dan Jalankan Kode

Latihan ini adalah bagian dari kursus

Supervised Learning dengan scikit-learn

SkillTag.level.intermediateSkillTag.label

4.8+

Mulai Kursus 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: Pengantar regresi Exercise 2: Membuat fitur Exercise 3: Membangun model regresi linear Exercise 4: Memvisualisasikan model regresi linear Exercise 5: Dasar-dasar regresi linear Exercise 6: Fit dan prediksi untuk regresi Exercise 7: Kinerja regresi Exercise 8: Validasi silang Exercise 9: Cross-validation untuk R-squared Exercise 10: Menganalisis metrik cross-validation Exercise 11: Regresi teratur Exercise 12: Regularized regression: Ridge

Latihan Saat Ini

Exercise 13: Regresi lasso untuk pentingnya fitur

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