实验室暑假学习第四周任务总结——机器学习模型初体验

清疚 2022-11-25 10:16 231阅读 0赞

## 写在前面 ##

完成前三周的任务之后，我们小组六个人都各自整理出了一份城市租房信息数据集。筛查并删除掉数据异常的信息之后，最终得到了一份含有中国六个城市（天津、咸阳、西安、宝鸡、深圳、北京）共9080条租房数据的总数据集。  
![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzQ1NTU0MDEw_size_16_color_FFFFFF_t_70]  
  接下来的任务是使用`sklearn`库中提供的模型，对房价进行预估。这里我选择了k-NN、岭回归、线性回归、决策树、随机森林五种模型。

## k-NN ##

代码如下：

#!/usr/bin/env python3
    # -*- coding: utf-8 -*-
    
    
    import numpy as np
    import pandas as pd
    from sklearn.model_selection import train_test_split
    from sklearn.neighbors import KNeighborsRegressor
    
    
    # 加载数据集
    dataset = pd.read_csv('./datasets/总数据集.csv', encoding='gbk')
    
    # 使用train_test_split()分离出测试集和训练集
    X_train, X_test, y_train, y_test = train_test_split(np.array(dataset.drop(columns=['月租'])), np.array(dataset['月租']),
                                                        test_size=0.2, random_state=22)
    print(y_test)
    
    # 构建k-NN模型
    knn = KNeighborsRegressor(n_neighbors=4)
    knn.fit(X_train, y_train)
    y_pred = knn.predict(X_test)
    print(y_pred)
    print('Training set score: {:.2f}'.format(knn.score(X_train, y_train)))
    print('Test set score: {:.2f}'.format(knn.score(X_test, y_test)))

输出结果如下：

[2000 1850 1300 ...  950 1500 1010]
    [1175.   1451.25 1175.   ...  939.   1225.   1102.5 ]
    Training set score: 0.77
    Test set score: 0.67

## 岭回归 ##

代码如下：

#!/usr/bin/env python3
    # -*- coding: utf-8 -*-
    
    
    import numpy as np
    import pandas as pd
    from sklearn.model_selection import train_test_split
    from sklearn.linear_model import Ridge
    
    
    # 加载数据集
    dataset = pd.read_csv('./datasets/总数据集.csv', encoding='gbk')
    
    # 使用train_test_split()分离出测试集和训练集
    X_train, X_test, y_train, y_test = train_test_split(np.array(dataset.drop(columns=['月租'])), np.array(dataset['月租']),
                                                        test_size=0.25, random_state=22)
    print(y_test)
    
    # 构建岭回归模型
    ridge = Ridge(alpha=10).fit(X_train, y_train)
    y_pred = ridge.predict(X_test)
    print(y_pred)
    print('Training set score: {:.2f}'.format(ridge.score(X_train, y_train)))
    print('Test set score: {:.2f}'.format(ridge.score(X_test, y_test)))

输出结果如下：

[2000 1850 1300 ... 1600  650  600]
    [1204.37018259 2163.5745905  1729.04638212 ... 2236.86333521  966.88410719
     1158.33879739]
    Training set score: 0.68
    Test set score: 0.71

## 线性回归 ##

代码如下：

#!/usr/bin/env python3
    # -*- coding: utf-8 -*-
    
    
    import numpy as np
    import pandas as pd
    from sklearn.model_selection import train_test_split
    from sklearn.linear_model import LinearRegression
    
    
    # 加载数据集
    dataset = pd.read_csv('./datasets/总数据集.csv', encoding='gbk')
    
    # 使用train_test_split()分离出测试集和训练集
    X_train, X_test, y_train, y_test = train_test_split(np.array(dataset.drop(columns=['月租'])), np.array(dataset['月租']),
                                                        test_size=0.25, random_state=22)
    print(y_test)
    
    # 构建线性回归模型
    lr = LinearRegression().fit(X_train, y_train)
    y_pred = lr.predict(X_test)
    print(y_pred)
    print('Training set score: {:.2f}'.format(lr.score(X_train, y_train)))
    print('Test set score: {:.2f}'.format(lr.score(X_test, y_test)))

输出结果如下：

[2000 1850 1300 ... 1600  650  600]
    [1204.08458918 2167.07002703 1729.80116253 ... 2235.10990609  964.65496297
     1159.57735581]
    Training set score: 0.68
    Test set score: 0.71

## 决策树 ##

代码如下：

#!/usr/bin/env python3
    # -*- coding: utf-8 -*-
    
    
    import numpy as np
    import pandas as pd
    from sklearn.model_selection import train_test_split
    from sklearn.tree import DecisionTreeRegressor
    
    
    # 加载数据集
    dataset = pd.read_csv('./datasets/总数据集.csv', encoding='gbk')
    
    # 使用train_test_split()分离出测试集和训练集
    X_train, X_test, y_train, y_test = train_test_split(np.array(dataset.drop(columns=['月租'])), np.array(dataset['月租']),
                                                        test_size=0.25, random_state=22)
    print(y_test)
    
    # 构建决策树模型
    dtr = DecisionTreeRegressor()
    dtr.fit(X_train, y_train)
    y_pred = dtr.predict(X_test)
    print(y_pred)
    print('Training set score: {:.2f}'.format(dtr.score(X_train, y_train)))
    print('Test set score: {:.2f}'.format(dtr.score(X_test, y_test)))

输出结果如下：

[2000 1850 1300 ... 1600  650  600]
    [ 900. 2205. 1200. ... 2000.  650.  600.]
    Training set score: 1.00
    Test set score: 0.91

## 随机森林 ##

代码如下：

#!/usr/bin/env python3
    # -*- coding: utf-8 -*-
    
    
    import numpy as np
    import pandas as pd
    from sklearn.model_selection import train_test_split
    from sklearn.ensemble import RandomForestRegressor
    from sklearn.model_selection import cross_val_score
    
    
    # 加载数据集
    dataset = pd.read_csv('./datasets/总数据集.csv', encoding='gbk')
    
    # 使用train_test_split()分离出测试集和训练集
    X_train, X_test, y_train, y_test = train_test_split(np.array(dataset.drop(columns=['月租'])), np.array(dataset['月租']),
                                                        test_size=0.25, random_state=22)
    print(y_test)
    
    # 使用随机森林方法
    rfr = RandomForestRegressor(n_estimators=200)
    rfr.fit(X_train, y_train)
    y_pred = rfr.predict(X_test)
    print(y_pred)
    print('Training set score: {:.2f}'.format(rfr.score(X_train, y_train)))
    print('Test set score: {:.2f}'.format(rfr.score(X_test, y_test)))

输出结果如下：

[2000 1850 1300 ... 1600  650  600]
    [1064.5  2211.89 1233.25 ... 1319.5   775.    579.15]
    Training set score: 0.99
    Test set score: 0.95

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