Using PCA

In this exercise, you'll apply PCA to the wine dataset, to see if you can increase the model's accuracy.

Deze oefening maakt deel uit van de cursus

Preprocessing for Machine Learning in Python

Oefeninstructies

Instantiate a PCA object.
Define the features (X) and labels (y) from wine, using the labels in the "Type" column.
Apply PCA to X_train and X_test, ensuring no data leakage, and store the transformed values as pca_X_train and pca_X_test.
Print out the .explained_variance_ratio_ attribute of pca to check how much variance is explained by each component.

Praktische interactieve oefening

Probeer deze oefening eens door deze voorbeeldcode in te vullen.

# Instantiate a PCA object
pca = ____()

# Define the features and labels from the wine dataset
X = wine.drop(____, ____)
y = wine["Type"]

X_train, X_test, y_train, y_test = train_test_split(X, y, stratify=y, random_state=42)

# Apply PCA to the wine dataset X vector
pca_X_train = ___.____(____)
pca_X_test = ___.____(____)

# Look at the percentage of variance explained by the different components
print(____)

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