import numpy as np import pandas as pd # 标签编码 from sklearn.preprocessing import LabelEncoder # 随机森林回归模型 from sklearn.ensemble import RandomForestRegressor # 交叉验证 from sklearn.model_selection import cross_val_score data = pd.read_excel('./data/汽车数据集/car.xlsx') le = LabelEncoder() for i in data.columns: data[i] = le.fit_transform(data[i]) from sklearn.model_selection import train_test_split train_x, test_x, train_y, test_y = train_test_split(data.iloc[:, :-1], data.iloc[:, -1], random_state=7) model = RandomForestRegressor(max_depth=6, n_estimators=200, random_state=7) model.fit(train_x, train_y) cvs = cross_val_score(model, train_x, train_y, cv=5, scoring='f1_weighted') print('f1得分: ', cvs.mean())
时间: 2023-12-13 15:03:58 浏览: 49
这段代码使用了随机森林回归模型对汽车数据集进行了训练和交叉验证。首先,使用pandas读取了Excel格式的汽车数据集,并使用LabelEncoder对所有特征进行了标签编码。然后,使用train_test_split将数据集分成了训练集和测试集。接着,使用随机森林回归模型对训练集进行了训练,并使用交叉验证对模型进行了评估。最后,使用f1_weighted作为评估指标,计算了模型的平均f1得分,并输出了结果。
相关问题
import pandas as pd import os from sklearn.model_selection import train_test_split from sklearn.ensemble import RandomForestClassifier from sklearn.metrics import accuracy_score # 计算准确性 import numpy as np from sklearn.tree import plot_tree import matplotlib.pyplot as plt # 画图 from sklearn.metrics import confusion_matrix # 绘制混淆矩阵时使用 from sklearn.metrics import roc_curve, auc # 绘制ROC曲线时使用 from sklearn.preprocessing import label_binarize # 使用sklearn中的LabelBinarizer可以将多分类标签转化为二分类标签 from sklearn.preprocessing import LabelEncoder from sklearn.preprocessing import LabelBinarizer
您的代码看起来像是在使用Python中的一些流行的机器学习库,如Pandas、Scikit-learn和Numpy。通过这些库,您可以进行数据处理、训练和评估机器学习模型。
具体来说,您的代码中使用了以下功能:
- 导入了pandas、os、sklearn等库;
- 使用sklearn中的train_test_split函数将数据集分为训练集和测试集;
- 使用RandomForestClassifier(随机森林分类器)进行分类任务;
- 使用accuracy_score函数计算模型的准确度;
- 导入numpy库;
- 使用plot_tree函数绘制决策树;
- 使用confusion_matrix函数绘制混淆矩阵;
- 使用roc_curve和auc函数绘制ROC曲线;
- 使用LabelEncoder和LabelBinarizer函数将标签进行编码。
总的来说,这些功能可以帮助您构建和评估机器学习模型。
优化这段代码# import modules 导入模块 from sklearn.model_selection import train_test_split from sklearn.decomposition import PCA import pandas as pd from sklearn import svm import numpy as np import math import matplotlib.pyplot as plt import matplotlib as mpl from matplotlib import colors from sklearn.model_selection import train_test_split from sklearn import datasets from matplotlib.colors import ListedColormap from sklearn.svm import SVC from sklearn.preprocessing import StandardScaler from sklearn.model_selection import StratifiedShuffleSplit,StratifiedKFold from sklearn.model_selection import GridSearchCV from sklearn.model_selection import GridSearchCV, LeaveOneOut, cross_val_predict from sklearn.model_selection import KFold from sklearn.linear_model import LogisticRegression from sklearn.naive_bayes import GaussianNB from sklearn.neighbors import KNeighborsClassifier from sklearn import svm from sklearn.tree import DecisionTreeClassifier from sklearn.ensemble import RandomForestClassifier from sklearn.metrics import roc_auc_score from sklearn.metrics import roc_auc_score import math import datetime import multiprocessing as mp from sklearn.ensemble import StackingClassifier from sklearn.pipeline import make_pipeline from sklearn.svm import LinearSVC import random
你可以对这段代码进行如下优化:
```python
import pandas as pd
import numpy as np
import math
import matplotlib.pyplot as plt
import matplotlib as mpl
from matplotlib import colors
from matplotlib.colors import ListedColormap
from sklearn.model_selection import train_test_split, StratifiedShuffleSplit, StratifiedKFold, GridSearchCV, LeaveOneOut, cross_val_predict, KFold
from sklearn.decomposition import PCA
from sklearn.svm import SVC, LinearSVC
from sklearn.preprocessing import StandardScaler
from sklearn.linear_model import LogisticRegression
from sklearn.naive_bayes import GaussianNB
from sklearn.neighbors import KNeighborsClassifier
from sklearn.tree import DecisionTreeClassifier
from sklearn.ensemble import RandomForestClassifier, StackingClassifier
from sklearn.metrics import roc_auc_score
# 导入模块
# 设置随机种子
random.seed(42)
np.random.seed(42)
# 其他代码...
```
这样做的优点是将导入的模块进行整理和分类,提高了代码的可读性。同时,设置了随机种子,保证了代码的可复现性。你可以根据需要添加其他的代码或模块。