KNN

“python，from sklearn.neighbors import KNeighborsClassifier，from sklearn.model_selection import train_test_split，from sklearn.datasets import load_iris，，iris = load_iris()，X_train, X_test, y_train, y_test = train_test_split(iris.data, iris.target, test_size=0.2)，，knn = KNeighborsClassifier(n_neighbors=3)，knn.fit(X_train, y_train)，，accuracy = knn.score(X_test, y_test)，print(“kNN分类准确率：”, accuracy)，“