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# -*-coding:utf-8-*-
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import argparse
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import pandas as pd
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from sklearn import preprocessing
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"""
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•PassengerID（ID）
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•Survived(存活与否)
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•Pclass（客舱等级，较为重要）
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•Name（姓名，可提取出更多信息）
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•Sex（性别，较为重要）
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•Age（年龄，较为重要）
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•Parch（直系亲友）
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•SibSp（旁系）
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•Ticket（票编号）
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•Fare（票价）
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•Cabin（客舱编号）
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•Embarked（上船的港口编号）
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"""
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# 随机森林算法
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from sklearn.ensemble import RandomForestRegressor
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def set_age(df):
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# 把已有的数值型特征取出来丢进RandomForgestRegressor
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age_df = df[['Age', 'Fare', 'Parch', 'SibSp', 'Pclass']]
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known_age = age_df[age_df.Age.notnull()].values
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unknown_age = age_df[age_df.Age.isnull()].values
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y = known_age[:, 0]
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x = known_age[:, 1:]
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rfr = RandomForestRegressor(random_state=0, n_estimators=2000, n_jobs=-1)
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rfr.fit(x, y)
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# 用得到的模型来进行未知年龄结果预测
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predictedAges = rfr.predict(unknown_age[:, 1::])
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df.loc[(df.Age.isnull()), 'Age'] = predictedAges
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return df
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def set_carbin(df):
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df.loc[df.Cabin.notnull(), 'Cabin'] = 1 # loc 获取指定行索引的行，'Cabin' 只获取指定行的列、对这些满足条件的列赋值
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df.loc[df.Cabin.isnull(), 'Cabin'] = 0
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df.Cabin.isnull().sum() # 验证填充效果
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return df
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def set_fare(df):
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"""
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填充Fare的缺失值
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fare主要和Pclass有关
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该人的Pclass等级为几,选择客舱等级为几的票价中位数填充
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"""
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df.loc[df.Pclass == 1, 'Fare'] = df[df.Pclass == 1]['Fare'].fillna(df[df.Pclass == 1]['Fare'].median())
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df.loc[df.Pclass == 2, 'Fare'] = df[df.Pclass == 2]['Fare'].fillna(df[df.Pclass == 2]['Fare'].median())
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df.loc[df.Pclass == 3, 'Fare'] = df[df.Pclass == 3]['Fare'].fillna(df[df.Pclass == 3]['Fare'].median())
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print(df[df.Fare.isnull()])
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return df
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def age_fare_scaler(df):
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# 特征因子化：通过get_dummies方法将类别型特征转换为数值型特征
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dummies_Cabin = pd.get_dummies(df['Cabin'], prefix='Cabin')
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dummies_Embarked = pd.get_dummies(df['Embarked'], prefix='Embarked')
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dummies_Sex = pd.get_dummies(df['Sex'], prefix='Sex')
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dummies_Pclass = pd.get_dummies(df['Pclass'], prefix='Pclass')
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# 将因子化后的特征与原始数据集合并在一起，并drop掉原始数据集中的类别型特征
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df = pd.concat([df, dummies_Cabin, dummies_Embarked, dummies_Sex, dummies_Pclass], axis=1)
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df.drop(['Pclass', 'Name', 'Sex', 'Ticket', 'Cabin', 'Embarked'], axis=1, inplace=True)
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"""
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代码中Age和Fare两个属性的数值幅度变化大，逻辑回归与梯度下降，
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各属性值之间的标准化差距太大，对收敛速度有影响甚至不收敛。
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"""
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# 标准化：通过preprocessing.StandardScaler（）类的fit_transform方法对数据进行标准化处理
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scaler = preprocessing.StandardScaler()
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df['Age_scaled'] = scaler.fit_transform(df[['Age']])
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df['Fare_scaled'] = scaler.fit_transform(df[['Fare']])
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# 将数据缩放到均值为0，标准差为1的范围内。提高模型的性能，加速模型的收敛
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return df
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def set_data(df):
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"""
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填充Embarked的值
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选择众数
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"""
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print(df.Embarked.mode())
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df['Embarked'].fillna('S', inplace=True)
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"""
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填充Fare的缺失值
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"""
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df = set_fare(df)
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"""
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填充carbin的值，有无carbin值作为参考。
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"""
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df = set_carbin(df)
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"""
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Age缺失值的处理
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"""
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df = set_age(df)
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df = age_fare_scaler(df)
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return df
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def getTitle(name):
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str1 = name.split(',')[1] # Mr. Owen Harris
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str2 = str1.split('.')[0] # Mr
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# strip() 方法用于移除字符串头尾指定的字符（默认为空格）
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str3 = str2.strip()
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return str3
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def set_name(df):
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titleDf = pd.DataFrame()
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# map函数：对Series每个数据应用自定义的函数计算
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titleDf['Title'] = df['Name'].map(getTitle)
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title_mapDict = {
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"Capt": "Officer",
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"Col": "Officer",
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"Major": "Officer",
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"Jonkheer": "Royalty",
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"Don": "Royalty",
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"Sir": "Royalty",
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"Dr": "Officer",
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"Rev": "Officer",
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"the Countess": "Royalty",
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"Dona": "Royalty",
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"Mme": "Mrs",
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"Mlle": "Miss",
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"Ms": "Mrs",
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"Mr": "Mr",
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"Mrs": "Mrs",
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"Miss": "Miss",
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"Master": "Master",
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"Lady": "Royalty"
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}
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# map函数：对Series每个数据应用自定义的函数计算
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titleDf['Title'] = titleDf['Title'].map(title_mapDict)
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# 使用get_dummies进行one-hot编码
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titleDf = pd.get_dummies(titleDf['Title'])
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# 添加one-hot编码产生的虚拟变量（dummy variables）到泰坦尼克号数据集full
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df = pd.concat([df, titleDf], axis=1)
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return df
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def pre_data(path):
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train_data = pd.read_csv('Data/train.csv')
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test_data = pd.read_csv('Data/test.csv')
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print("\n原始数据缺失情况：")
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print(train_data.isnull().sum()) # 查看数据的缺失情况
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# 数据处理
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train_datapath = path + '/Data/new_train.csv'
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train_data = set_data(train_data)
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train_data.to_csv(train_datapath, index=False)
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# 测试集处理
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test_datapath = path + '/Data/new_test.csv'
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test_data = set_data(test_data)
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test_data.to_csv(test_datapath, index=False)
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pd.set_option('display.max_columns', None)
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print(train_data)
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print("\n数据处理后情况：")
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print(train_data.isnull().sum()) # 查看数据的缺失情况
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return train_data, test_data
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if __name__ == '__main__':
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parser = argparse.ArgumentParser()
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# 参数default值为素材地址与文件保存地址
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parser.add_argument("--dest_path", default='E:/python1/123', help="files save path")
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parser.add_argument('--train', default='Data/train.csv', help="train data")
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parser.add_argument('--test', default='Data/test.csv', help="test data")
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parser.add_argument("--testoutput", default="E:/python1/123/Data/new_test.csv",
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help="new test data output path")
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parser.add_argument("--trainoutput", default="E:/python1/123/Data/new_train.csv",
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help="new train data output path")
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args = parser.parse_args()
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train = pd.read_csv(args.train)
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test = pd.read_csv(args.test)
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print("\n原始数据缺失情况：")
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print(train.isnull().sum()) # 查看数据的缺失情况
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# 数据处理
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train_data_path = args.dest_path + '/Data/new_train.csv'
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train = set_data(train)
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train.to_csv(train_data_path, index=False)
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# 测试集处理
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test_data_path = args.dest_path + '/Data/new_test.csv'
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test = set_data(test)
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test.to_csv(test_data_path, index=False)
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pd.set_option('display.max_columns', None)
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print(train)
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print("\n原始数据处理后情况：")
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print(train.isnull().sum()) # 查看数据的缺失情况
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