# 导入相关库 import pandas as pd import matplotlib.pyplot as plt from sklearn.model_selection import train_test_split from sklearn.tree import DecisionTreeClassifier from sklearn.ensemble import RandomForestClassifier from sklearn.metrics import accuracy_score, precision_score, recall_score, f1_score,roc_auc_score,roc_curve # 读取数据 df = pd.read_csv('C:/Users/E15/Desktop/机器学习作业/第一次作业/第一次作业/三个数据集/Titanic泰坦尼克号.csv') # 数据预处理 df = df.drop(["Name", "Ticket", "Cabin"], axis=1) # 删除无用特征 df = pd.get_dummies(df, columns=["Sex", "Embarked"]) # 将分类特征转换成独热编码 df = df.fillna(df.mean()) # 使用平均值填充缺失值 # 划分数据集 X = df.drop(["Survived"], axis=1) y = df["Survived"] X_train, X_test, y_train, y_test = train_test_split(X, y, test_size=0.2, random_state=42) # 决策树 dtc = DecisionTreeClassifier(random_state=42) dtc.fit(X_train, y_train) y_pred_dtc = dtc.predict(X_test) # 剪枝决策树 pruned_dtc = DecisionTreeClassifier(random_state=42, ccp_alpha=0.015) pruned_dtc.fit(X_train, y_train) y_pred_pruned_dtc = pruned_dtc.predict(X_test) # 随机森林 rfc = RandomForestClassifier(n_estimators=100, random_state=42) rfc.fit(X_train, y_train) y_pred_rfc = rfc.predict(X_test) # 计算评价指标 metrics = {"Accuracy": accuracy_score, "Precision": precision_score, "Recall": recall_score, "F1-Score": f1_score, "AUC": roc_auc_score} results = {} for key in metrics.keys(): if key == "AUC": results[key] = {"Decision Tree": roc_auc_score(y_test, y_pred_dtc), "Pruned Decision Tree": roc_auc_score(y_test, y_pred_pruned_dtc), "Random Forest": roc_auc_score(y_test, y_pred_rfc)} else: results[key] = {"Decision Tree": metrics[key](y_test, y_pred_dtc), "Pruned Decision Tree": metrics[key](y_test, y_pred_pruned_dtc), "Random Forest": metrics[key](y_test, y_pred_rfc)} # 打印评价指标的表格 results_df = pd.DataFrame(results) print(results_df)怎么打印auv图

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import pandas as pd.docx

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

from sklearn.model_selection import train_test_split, StratifiedShuffleSplit, StratifiedKFold, GridSearchCV, LeaveOneOut, cross_val_predict, KFold from sklearn.decomposition import PCA from sklearn....

在Python中想运行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怎么操作

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 pandas as pd import numpy as np import matplotlib.pyplot as plt from sklearn.model_selection import train_test_split from sklearn.preprocessing import MinMaxScaler from sklearn.linear_model import LogisticRegression from sklearn.tree import DecisionTreeClassifier from sklearn.neighbors import KNeighborsClassifier from sklearn.svm import SVC from sklearn.metrics import classification_report from sklearn.metrics import confusion_matrix

这段代码是在 Python 中导入了一些常用的机器学习库和模块，包括 pandas、numpy、matplotlib、sklearn 等。其中： - pandas 是 Python 中常用的数据分析库，可以用来读取和处理数据； - numpy 是 Python 中常用的...

import pandas as pd import csv import matplotlib.pyplot as plt import tkinter as tk from PIL import Image, ImageTk from tkinter import filedialog from matplotlib.backends.backend_tkagg import FigureCanvasTkAgg from tkinter import Tk, Button, Text, filedialog, messagebox from sklearn.preprocessing import StandardScaler,LabelEncoder from sklearn.model_selection import train_test_split from sklearn.linear_model import LinearRegression from sklearn.tree import DecisionTreeRegressor from sklearn.ensemble import RandomForestRegressor解释每一句代码的含义

- from sklearn.model_selection import train_test_split: 从sklearn库中导入train_test_split模块，用于将数据集划分为训练集和测试集。 - from sklearn.linear_model import LinearRegression: 从sklearn库中...

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

- 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_...

运行下面代码需要安装哪些包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

- matplotlib：用于绘制图表和数据可视化的库。可以使用pip install matplotlib进行安装。这些包是常用的数据分析和机器学习库，可以通过pip安装。在安装之前，确保你已经正确地配置了Python环境和pip工具。

import pandas as pd import numpy as np import matplotlib.pyplot as plt from pylab import * import seaborn as sns import os from scipy import stats from sklearn import model_selection, preprocessing, naive_bayes, metrics, svm from sklearn.model_selection import train_test_split, GridSearchCV from sklearn.linear_model import LogisticRegression from sklearn.neighbors import KNeighborsClassifier from sklearn import ensemble, tree # 忽略警告提示

这段代码的作用是导入所需的Python库和模块，并忽略警告提示。其中包括： - pandas：用于数据处理和分析的Python库。 - numpy：用于数值计算的Python库。 - matplotlib：用于绘制数据可视化图表的Python库。 - ...

import pandas as pd import numpy as np import scipy.stats as stats import seaborn as sns from sklearn.metrics import RocCurveDisplay from sklearn.model_selection import train_test_split from sklearn.metrics import confusion_matrix,accuracy_score from sklearn.preprocessing import StandardScaler from sklearn.linear_model import LogisticRegression from sklearn import tree from sklearn.decomposition import PCA import matplotlib.pyplot as plt from sklearn.tree import DecisionTreeClassifier请在此基础上续写代码块，要求是（1）读入数据后，选取自变量"sysBP", "diaBP","age","totChol","BMI", "heartRate", "glucose"记为X，因变量"TenYearCHD"记为y，组成新的数据集。¶

from sklearn.model_selection import train_test_split from sklearn.metrics import confusion_matrix,accuracy_score from sklearn.preprocessing import StandardScaler from sklearn.linear_model import ...

通过以下代码，帮我用图形把决策树训练的模型保存成图片，用heart-tree.jpg命名。写出代码。下面是代码import pandas as pd from sklearn import tree from sklearn.ensemble import RandomForestClassifier import matplotlib.pyplot as plt import numpy as np heart=pd.read_csv("D:\Anaconda1\heart.csv") heart.head() clf_tree = tree.DecisionTreeClassifier() from sklearn.model_selection import train_test_split x = heart.drop('target',axis = 1) y = heart['target'] x_train,x_test,y_train,y_test = train_test_split(x,y,random_state=0) clf_tree.fit(x_train,y_train) print(clf_tree.score(x_train,y_train)) print(clf_tree.score(x_test,y_test))

from sklearn.tree import export_graphviz import graphviz # 导出决策树模型 dot_data = export_graphviz(clf_tree, out_file=None, feature_names=x.columns, class_names=['0', '1'], filled=True, ...

import pandas as pd from sklearn.model_selection import train_test_split from sklearn.tree import DecisionTreeClassifier, plot_tree from sklearn.preprocessing import LabelEncoder import matplotlib.pyplot as plt # 加载csv文件 data = pd.read_csv("data填补.csv") # 将标签进行编码 le = LabelEncoder() data['label'] = le.fit_transform(data['label']) # 划分自变量和因变量 X = data.drop(columns=["label"]) y = data["label"] # 将数据集划分为训练集和测试集 X_train, X_test, y_train, y_test = train_test_split(X, y, test_size=0.2, random_state=42) # 定义决策树模型 dt_model = DecisionTreeClassifier() # 训练决策树模型 dt_model.fit(X_train, y_train) # 计算测试集的准确率 accuracy = dt_model.score(X_test, y_test) print("测试集准确率：", accuracy) # 可视化决策树 plt.figure(figsize=(30, 30)) plot_tree(dt_model, filled=True, feature_names=X.columns, class_names=le.classes_) plt.show()我想使这段代码生成的决策图只显示置信度大于0.95的区间应该如何更改

from sklearn.model_selection import train_test_split from sklearn.tree import DecisionTreeClassifier, plot_tree from sklearn.preprocessing import LabelEncoder import matplotlib.pyplot as plt # ...

import pandas as pd import numpy as np import matplotlib.pyplot as plt import seaborn as sns from sklearn.model_selection import train_test_split from sklearn.ensemble import RandomForestClassifier from sklearn.tree import DecisionTreeClassifier # 导入需要的模块 import warnings warnings.filterwarnings("ignore") from sklearn.metrics import confusion_matrix from itertools import cycle # from scipy import interp from sklearn.metrics import roc_curve, auc data = pd.read_csv('newdate.csv') print(data.head()) print(data.info()) print(data[data['Label'].isnull()]) data = data.dropna() print(data.info()) data['Label'] = data['Label'].map(int) print(data.info()) # 数据归一化 def normalization(data): _range = np.max(data) - np.min(data) return (data - np.min(data)) / _range data['铁水温度'] = normalization(data['铁水温度']) data['透气性指数'] = normalization(data['透气性指数']) print(data) # 相关性分析 plt.figure(figsize=(10, 10)) sns.heatmap(data=data.corr(), annot=True, cmap='Accent', vmax=1, vmin=-1) plt.show() df = pd.DataFrame(data.groupby(['Label'])['铁水温度'].count()) df.columns = ['num'] df.reset_index(inplace=True) print(df)解释每一行代码

from sklearn.model_selection import train_test_split from sklearn.ensemble import RandomForestClassifier from sklearn.tree import DecisionTreeClassifier import warnings warnings.filterwarnings(...

import numpy as np import pandas as pd from sklearn.model_selection import train_test_split, GridSearchCV from sklearn.metrics import accuracy_score, precision_score, recall_score, f1_score from sklearn.metrics import confusion_matrix import matplotlib.pyplot as plt from termcolor import colored as cl import itertools from sklearn.preprocessing import StandardScaler from sklearn.tree import DecisionTreeClassifier from sklearn.neighbors import KNeighborsClassifier from sklearn.linear_model import LogisticRegression from sklearn.svm import SVC from sklearn.ensemble import RandomForestClassifier from xgboost import XGBClassifier from sklearn.neural_network import MLPClassifier from sklearn.ensemble import VotingClassifier # 定义模型评估函数 def evaluate_model(y_true, y_pred): accuracy = accuracy_score(y_true, y_pred) precision = precision_score(y_true, y_pred, pos_label='Good') recall = recall_score(y_true, y_pred, pos_label='Good') f1 = f1_score(y_true, y_pred, pos_label='Good') print("准确率:", accuracy) print("精确率:", precision) print("召回率:", recall) print("F1 分数:", f1) # 读取数据集 data = pd.read_csv('F:\数据\大学\专业课\模式识别\大作业\数据集1\data clean Terklasifikasi baru 22 juli 2015 all.csv', skiprows=16, header=None) # 检查数据集 print(data.head()) # 划分特征向量和标签 X = data.iloc[:, :-1] y = data.iloc[:, -1] # 划分训练集和测试集 X_train, X_test, y_train, y_test = train_test_split(X, y, test_size=0.2, random_state=42) # 6. XGBoost xgb = XGBClassifier(max_depth=4) y_test = np.array(y_test, dtype=int) xgb.fit(X_train, y_train) xgb_pred = xgb.predict(X_test) print("\nXGBoost评估结果：") evaluate_model(y_test, xgb_pred)

5. 划分训练集和测试集：使用sklearn库的train_test_split()函数将数据集划分为训练集和测试集。 6. 使用XGBoost算法进行分类：使用XGBClassifier类构建XGBoost分类器，并使用fit()函数将训练集拟合到该分类器中。...

我已经用数据训练好决策树和随机森林，现在需要用输入数据，用数据预测这组数据描述的病人是否患有心脏病，请给我测试的代码。下面是我的训练过程import pandas as pd from sklearn import tree from sklearn.ensemble import RandomForestClassifier import matplotlib.pyplot as plt import numpy as np heart=pd.read_csv("D:\Anaconda1\heart.csv") heart.head() heart.info() clf_tree = tree.DecisionTreeClassifier() from sklearn.model_selection import train_test_split x = heart.drop('target',axis = 1) y = heart['target'] x_train,x_test,y_train,y_test = train_test_split(x,y,random_state=0) clf_tree.fit(x_train,y_train) print(clf_tree.score(x_train,y_train)) print(clf_tree.score(x_test,y_test)) tree.export_graphviz(clf, out_file='tree.dot') score_list=[] for i in range(10,100,10): clf_forest = RandomForestClassifier(n_estimators = i, random_state = 0) clf_forest.fit(x_train,y_train) score_list.append(clf_forest.score(x_test,y_test)) plt.plot(range(10,100,10), score_list) plt.show() print(np.argmax(score_list)) print(np.max(score_list))

import pandas as pd from sklearn import tree from sklearn.ensemble import RandomForestClassifier # 读入测试数据 test_data = pd.read_csv("test_data.csv") # 加载训练好的决策树模型 clf_tree = tree....

#根据编程要求，补充下面Begin-End区间的代码 import numpy as np import pandas as pd import numpy as np import pandas as pd from sklearn.tree import DecisionTreeClassifier, export_graphviz # 导入决策树模型 from sklearn.model_selection import train_test_split # 导入数据集划分模块 import matplotlib.pyplot as plt from sklearn.metrics import roc_auc_score from sklearn.metrics import classification_report # 数据的读入与处理 data_path ='/data/bigfiles/7db918ff-d514-49ea-8f6b-ea968df742e9' df = pd.read_csv(data_path,header=None,names=['age', 'workclass', 'fnlwgt', 'education', 'education-num','marital-status','occupation','relationship','race','sex','capital-gain','capital-loss','hours-per-week','native-country','salary']) ######Begin ###### # 去除字符串数值前面的空格 # 去除fnlwgt, capital-gain, capital-loss,特征属性 # 将特征采用哑变量进行编码，字符型特征经过转化可以进行训练 # 将label编码 ###### End ###### ######Begin ###### # 按4：1的比例划分训练和测试集 # 构建模型 #对训练集X_train训练 #对于测试集x_test进行预测 # 其他指标计算 print(classification_report(y_test, x_pre_test)) # 预测测试集概率值 #计算验证集的auc值,参数为预测值和概率估计 ###### End ###### print("auc的值：{}".format(auc))

X_train, X_test, y_train, y_test = train_test_split(X, y, test_size=0.2, random_state=42) # 构建模型 dt = DecisionTreeClassifier(random_state=42) # 对训练集X_train训练 dt.fit(X_train, y_train) # ...

from sklearn.ensemble import AdaBoostRegressor from sklearn.tree import DecisionTreeRegressor from sklearn.linear_model import LinearRegression from sklearn.ensemble import RandomForestRegressor from sklearn.model_selection import train_test_split import numpy as np import pandas as pd import matplotlib.pyplot as plt from sklearn.metrics import mean_squared_error as MSE from sklearn.metrics import mean_absolute_error as MAE # 从CSV文件中读取数据 data = pd.read_excel('battery.xlsx') # 分离X和y X = data.iloc[:, :-1].values y = data.iloc[:, -1].values X_train, X_test, y_train, y_test = train_test_split(X, y, test_size=0.2, random_state=0) # 定义基础模型 linear_model = LinearRegression() decision_tree_model = DecisionTreeRegressor(max_depth=5) random_forest_model = RandomForestRegressor(n_estimators=100, max_depth=30, random_state=42) base_model = [linear_model, decision_tree_model, random_forest_model] # 定义AdaBoost回归器 ada_boost = AdaBoostRegressor(base_estimator=DecisionTreeRegressor(max_depth=5), n_estimators=100, learning_rate=0.1, random_state=42) # 训练模型 ada_boost.fit(X_train, y_train) # 预测并计算均方误差 y_pred = ada_boost.predict(X_test) print("MAE：", MAE(y_pred, y_test)) print("MSE：", MSE(y_pred, y_test)) print("RMSE：", np.sqrt(MSE(y_pred, y_test))) print("训练集R^2：", ada_boost.score(X_train, y_train)) print("测试集R^2：", ada_boost.score(X_test, y_test)) # 评估预测结果 plt.figure() plt.plot(range(len(y_pred)), y_pred, 'b', label = 'predict') plt.plot(range(len(y_pred)), y_test, 'r', label = 'test') plt.legend(loc = 'upper right') plt.ylabel("SOH") plt.show() 请告诉我这个代码是什么意思

首先，通过pandas库读取一个名为'battery.xlsx'的Excel文件中的数据，并将其分为X和y两个部分。然后，将数据集拆分为训练集和测试集，其中测试集占总数据集的20%。接着，定义了3个基础模型：线性回归模型、决策树...

优化这段代码import numpy as np from scipy.spatial.distance import cdist from sklearn.model_selection import train_test_split from sklearn.neighbors import KNeighborsClassifier from sklearn.metrics import accuracy_score import pandas as pd # 导入pd库读取文件 import matplotlib.pyplot as plt from mpl_toolkits.mplot3d import Axes3D #绘制3D图 # 读取txt文件做数据集 D_path = r"G:\Pycharm\pythonProject1\HomeWork2 for KNN.txt" # 通过read_csv读取txt文件的内容 data_set = pd.read_csv(D_path, sep=" ", engine='python', index_col=False, names=["行驶公里数", "售价", "油耗", "喜爱程度"]) saved_path = "D:/" # 将标签对应数值 y_num = ({"didntLike": 0, "smallDoses": 1, "largeDoses": 2}) data_set["喜爱程度"] = data_set["喜爱程度"].map(y_num) X = data_set[["行驶公里数", "售价", "油耗"]] y = data_set["喜爱程度"] X_train,X_test,y_train,y_test = train_test_split(X, y, test_size=0.33, shuffle=True) knn = KNeighborsClassifier(algorithm="kd_tree") knn.fit(X_train, y_train) pred = knn.predict(X_test) print("预测精度：{:.2%}".format(accuracy_score(pred, y_test))) #------------------3D图----------------------# fig = plt.figure(figsize=(18,12), facecolor='lightgray') ax = fig.add_subplot(111,projection='3d') # 行数：1, 列数：1, 位置：1 ax.scatter(X_test["行驶公里数"], X_test["售价"], X_test["油耗"], c=pred) plt.savefig(saved_path+ "3D" + ".jpg") plt.show()

from sklearn.model_selection import train_test_split from sklearn.neighbors import KNeighborsClassifier from sklearn.metrics import accuracy_score def load_data(file_path): """ 读取数据集 """ ...

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