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November 23, 2020 09:22
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3 ways to do dimensional reduction techniques in Scikit-learn
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from sklearn.manifold import TSNE | |
# each feature should be centered (zero mean) and with unit variance | |
X_normalized = StandardScaler().fit(X).transform(X) | |
tsne = TSNE(random_state = 0) | |
X_tsne = tsne.fit_transform(X_normalized) | |
print(X.shape, X_tsne.shape) | |
(569, 30) (569, 2) | |
X_train_tsne, X_test_tsne, y_train, y_test = train_test_split(X_tsne, y, random_state=0) | |
clf_tsne = LogisticRegression(random_state=0) | |
clf_tsne.fit(X_train_tsne, y_train) | |
print('%s: %.3f' % ('Logreg Train Accuracy', accuracy_score(y_train, clf_tsne.predict(X_train_tsne)))) | |
print('%s: %.3f' % ('Logreg Test Accuracy', accuracy_score(y_test, clf_tsne.predict(X_test_tsne)))) | |
print('%s: %.3f' % ('Logreg Train F1 Score', f1_score(y_train, clf_tsne.predict(X_train_tsne)))) | |
print('%s: %.3f' % ('Logreg Test F1 Score', f1_score(y_test, clf_tsne.predict(X_test_tsne)))) | |
print(classification_report(y_test, clf_tsne.predict(X_test_tsne))) |
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