谁能帮我？ ValueError：x 和 y 必须具有相同的第一维，但具有形状 (10,) 和 (0,)

Question

这是我的代码：

from sklearn.datasets import load_breast_cancer

cancer = load_breast_cancer()
X_train, X_test, y_train, y_test = train_test_split(
    cancer.data, cancer.target, stratify=cancer.target, random_state=66)

training_accuracy = []
test_accuracy = []
# try n_neighbours from 1 to 10
neighbors_settings = range(1, 11)

for n_neighbors in neighbors_settings:
    # build the model
    clf = KNeighborsClassifier(n_neighbors=n_neighbors)
    clf.fit(X_train, y_train)
    # record generalisation accuracy
    test_accuracy.append(clf.score(X_test, y_test))

plt.plot(neighbors_settings, training_accuracy, label="training accuracy")

它在最后一行抛出错误

Answer 1

我认为您错过了将neighbors_settings转换为列表

只需在下面添加第一行：

neighbors_settings = list(neighbors_settings)
plt.plot(neighbors_settings, training_accuracy, label="training accuracy")
plt.plot(neighbors_settings, test_accuracy, label="testing accuracy")

它应该工作