初识机器学习 | 如何评价模型好坏

    import pandas as pd
    from sklearn.datasets import load_breast_cancer
    from sklearn.model_selection import train_test_split
    from sklearn.preprocessing import StandardScaler
    from sklearn.linear_model import LogisticRegression
    
    
    
      
      
      
      
      
      
    

    # 1)读取数据
    cancer = load_breast_cancer()
    
    # 2)数据集划分
    x_train, x_test, y_train, y_test = train_test_split(cancer.data, cancer.targe