sklearn knn算法分类鸢尾花

    #knn 算法用于鸢尾花
    import numpy as np
    #准确率
    
    from sklearn import datasets #自带数据集
    from sklearn.metrics import accuracy_score
    # knn算法
    from sklearn.neighbors import KNeighborsClassifier
    #训练集和测试集区分                                  交叉验证
    from sklearn.model_selection import train_test_split, cross_val_score
    
    
    import pandas as pd
    import matplotlib.pyplot as plt
    
    
    
    def predict():
    iris = datasets.load_iris() #加载sklearn自带的数据集
    x = iris.data #这是数据
    y = iris.target #这是每个数据所对应的标签
    x_train,x_test,y_train,y_test = train_test_spl