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())

机器学习的算法(python).zip

12. **特征选择和预处理**：特征缩放（如sklearn.preprocessing.scale）、编码（如sklearn.preprocessing.LabelEncoder）和选择（如sklearn.feature_selection.SelectKBest）是机器学习流程的重要步骤。...

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。...- 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

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....

解释这段代码import numpy as np import pandas as pd from datetime import datetime from scipy.stats import skew from scipy.special import boxcox1p from scipy.stats import boxcox_normmax from sklearn.linear_model import ElasticNetCV, LassoCV, RidgeCV, Ridge from sklearn.ensemble import GradientBoostingRegressor from sklearn.svm import SVR from sklearn.pipeline import make_pipeline from sklearn.preprocessing import RobustScaler, StandardScaler from sklearn.model_selection import KFold, cross_val_score from sklearn.metrics import mean_squared_error as mse from sklearn.metrics import make_scorer from sklearn.neighbors import LocalOutlierFactor from sklearn.linear_model import LinearRegression from mlxtend.regressor import StackingCVRegressor # from xgboost import XGBRegressor # from lightgbm import LGBMRegressor import matplotlib.pyplot as plt import seaborn as sns

- from sklearn.ensemble import GradientBoostingRegressor：从sklearn.ensemble模块中导入GradientBoostingRegressor函数，用于进行梯度提升回归。 - from sklearn.svm import SVR：从sklearn.svm模块中导入...

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

- sklearn：用于机器学习和数据挖掘的Python库，包括数据预处理、模型选择、模型评估等。 - naive_bayes：朴素贝叶斯分类器模块。 - metrics：模型评估指标模块。 - svm：支持向量机模块。 - LogisticRegression：...

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)

1. 导入需要的库：numpy、pandas、sklearn等。 2. 定义模型评估函数：evaluate_model(y_true, y_pred)，该函数用于计算模型预测结果的准确率、精确率、召回率和F1分数。 3. 读取数据集：使用pandas库的read_csv()...

import pandas as pd import numpy as np from sklearn.linear_model import Ridge from sklearn.preprocessing import StandardScaler from sklearn.preprocessing import PolynomialFeatures from sklearn.model_selection import train_test_split # 读取 Excel 文件 data = pd.read_excel('D://数据1.xlsx', sheet_name='000') # 把数据分成输入和输出 X = data.iloc[:, 0:4].values y = data.iloc[:, 0:4].values # 标准化处理 scaler = StandardScaler() X = scaler.fit_transform(X) # 添加多项式特征 poly = PolynomialFeatures(degree=2, include_bias=False) X = poly.fit_transform(X) # 将数据分为训练集和测试集 X_train, X_test, y_train, y_test = train_test_split(X, y, test_size=0.1, random_state=0) # 创建岭回归模型, 加入L2正则化 model = Ridge(alpha=1, solver='auto', max_iter=1000, tol=0.001, random_state=None, # 加入L2正则化 fit_intercept=True) # 拟合模型 model.fit(X_train, y_train) # 使用模型进行预测 y_pred = model.predict(X_test) # 将预测结果四舍五入取整 y_pred = np.round(y_pred) # 去除重复行 y_pred = np.unique(y_pred, axis=0) # 打印预测结果 print(y_pred)在这段代码中加入模型集成：通过将多个模型进行集成，可以提高模型的表现

from sklearn.ensemble import RandomForestRegressor # 训练多个随机森林模型 models = [] for i in range(10): model = RandomForestRegressor(n_estimators=100, max_depth=5, random_state=i) model.fit(X_...

Python实现随机森林回归模型：从入门到精通，预测未来如此简单

![随机森林]...随机森林回归是一种机器学习算法，用于解决回归问题。它属于集成学习方法，通过组合多个决策树来提高预测精度。在Python中，我们可以使用s

随机森林回归：Python构建稳健预测模型的6大技巧

随机森林是一种强大的集成学习算法，它通过构建多个决策树并将它们的结果进行汇总来提高整体模型的预测性能。这种算法在处理大量数据集时表现尤为出色，尤其是在数据特征维度很高时仍然能保持良好的泛化能力。随机...

import tkinter as tk from tkinter import filedialog import pandas as pd import numpy as np from sklearn.impute import SimpleImputer from sklearn.ensemble import IsolationForest from sklearn.preprocessing import StandardScaler import warnings class DataImporter: def init(self, master): self.file_path = None self.master = master self.master.title("数据导入") # 创建用于显示文件路径的标签 self.path_label = tk.Label(self.master, text="请先导入数据集！") self.path_label.pack(pady=10) # 创建“导入数据集”按钮 self.load_button = tk.Button(self.master, text="导入数据集", command=self.load_data) self.load_button.pack(pady=10) # 创建“显示数据集”按钮 self.show_button = tk.Button(self.master, text="显示数据集", command=self.show_data) self.show_button.pack(pady=10) # 创建“退出程序”按钮 self.quit_button = tk.Button(self.master, text="退出程序", command=self.master.quit) self.quit_button.pack(pady=10) # 创建一个空的 DataFrame 用于存放数据集 self.data = pd.DataFrame() def load_data(self): # 弹出文件选择对话框 file_path = filedialog.askopenfilename() # 如果用户选择了文件，则导入数据集 if file_path: self.data = pd.read_csv(file_path, delimiter=';') self.path_label.config(text=f"已导入数据集：{file_path}") else: self.path_label.config(text="未选择任何文件，请选择正确的文件")

这段代码是用于导入数据集的，它使用了 tkinter 库来创建一个 GUI 界面，让用户选择需要导入的数据集文件，并且使用 pandas 库来读取 csv 格式的数据集文件。同时，这段代码还使用了一些机器学习库，如 sklearn 的 ...

请调试这段代码以实现梯度上升模型进行波士顿房价预测，画出预测图，代码如下：import pandas as pd import numpy as np import matplotlib.pyplot as plt from sklearn.model_selection import train_test_split from sklearn.metrics import mean_squared_error plt.style.use('ggplot') # 读入数据 data = pd.read_csv('D:\PycharmProjects\Boston_housing\housing.csv') X, y = data[data.columns.delete(-1)], data['MEDV'] X_train, X_test, y_train, y_test = train_test_split(X, y, test_size=0.2, random_state=888) from sklearn.preprocessing import StandardScaler ss_x = StandardScaler() X_train = ss_x.fit_transform(X_train) X_test = ss_x.transform(X_test) ss_y = StandardScaler() y_train = ss_y.fit_transform(y_train.values.reshape(-1, 1)) y_test = ss_y.transform(y_test.values.reshape(-1, 1)) from sklearn import ensemble # params = {'n_estimators': 500, 'max_depth': 4, 'min_samples_split': 1,'learning_rate': 0.01, 'loss': 'ls'} # clf = ensemble.GradientBoostingRegressor(**params) clf = ensemble.GradientBoostingRegressor() clf.fit(X_train, y_train) clf_pre_values = clf.predict(X_test) # 预测值 print('SCORE:{:.4f}'.format(clf.score(X_test, y_test))) # 模型评分 print('RMSE:{:.4f}'.format(np.sqrt(mean_squared_error(y_test, clf_pre_values)))) # RMSE(标准误差) clf_pre = pd.DataFrame() clf_pre['Predict'] = clf_pre_values clf_pre['Truth'] = y_test.reset_index(drop=True) clf_pre.plot(figsize=(18, 8)) plt.figure() plt.show()

import matplotlib.pyplot as plt 这样才能正确使用plt.figure()和plt.show()函数。请尝试调试代码并确保数据文件路径正确，导入所需的模块，并重新运行代码。希望能帮到您！如果还有其他问题，请随时...

import data as data import pandas as pd import warnings import numpy as np import matplotlib.pyplot as plt from sklearn.ensemble import IsolationForest from sklearn.pipeline import Pipeline from sklearn.preprocessing import StandardScaler warnings.filterwarnings('ignore') plt.rcParams['font.sans-serif'] =['SimHei'] ##显示中文 plt.rcParams['axes.unicode_minus'] = False data = pd.read_csv('./data/dataset.csv') data['label'] = 0 # 异常值 # 三列值小于0 data.loc[(data['WindSpeed'] <= 0), 'label'] = 1 data.loc[(data['Power'] <= 0), 'label'] = 1 data.loc[(data['RotorSpeed'] <= 0), 'label'] = 1 def isolationForest_model(contamination='auto',max_samples=0.1,isStandard=True): if isStandard: model = Pipeline([ ('ss', StandardScaler()), #数据标准化过程 ('iForest', IsolationForest(max_samples=max_samples,contamination=contamination))]) else: model = Pipeline([ ('iForest', IsolationForest(max_samples=max_samples,contamination=contamination))]) return model features=['WindSpeed','Power', 'RotorSpeed'] new_data=pd.DataFrame() new_data=new_data.append(data[data['label']==1]) df1 = data['label']==0 model = isolationForest_model(isStandard=True,contamination=0.05) model.fit(df1[features]) #返回1表示正常值，-1表示异常值 result = model.predict(df1[features]) df1['label'] = result df1['label']=df1['label'].map({-1:1,1:0}) new_data=new_data.append(df1) new_data.loc[new_data['label']!=0,'label']=1

1. 导入必要的库，包括 pandas、numpy、matplotlib 和 sklearn 中的 IsolationForest 模型等。 2. 读取数据集，将数据集中三列值小于等于 0 的行标记为异常值。 3. 定义一个孤立森林模型，并设置是否需要对数据...

修正以下的代码data = pd.read_excel(r"D:\pythonProject60\filtered_data1.xlsx") X = data.iloc[:, :-1] y = data.iloc[:, -1] from scipy.interpolate import interp1d # 数据归一化 scaler = StandardScaler() # 将X,Y数据进行归一化 X = scaler.fit_transform(X) # 随机划分训练集和测试集 X_train, X_test, y_train, y_test = train_test_split(X, y, test_size=0.3, train_size=0.7) X_fuzzy = [] for i in range(X.shape[1]): fuzzy_vals = fuzz.trimf(X[:,i], [np.min(X[:,i]), np.mean(X[:,i]), np.max(X[:,i])]) X_fuzzy.append(fuzzy_vals) X_fuzzy = np.array(X_fuzzy).T # 构建深度神经模糊网络 model = tf.keras.Sequential([ tf.keras.layers.Dense(64, activation='relu', input_dim=X_fuzzy.shape[1]), tf.keras.layers.Dense(32, activation='relu'), tf.keras.layers.Dense(1, activation='sigmoid') ]) model.compile(optimizer='adam', loss='binary_crossentropy', metrics=['accuracy']) model.fit(X_fuzzy, y, epochs=10, batch_size=32) # 训练随机森林分类器 rf_clf = RandomForestClassifier(n_estimators=100, max_depth=5) rf_clf.fit(model.predict(X_fuzzy), y) # 预测新数据点 new_data = np.random.rand(5) new_data_fuzzy = [] for i in range(new_data.shape[0]): fuzzy_val = fuzz.interp_membership(np.linspace(np.min(X[:,i]), np.max(X[:,i]), 100), fuzz.trimf(np.linspace(np.min(X[:,i]), np.max(X[:,i]), 100), [np.min(X[:,i]), np.mean(X[:,i]), np.max(X[:,i])]), new_data[i]) new_data_fuzzy.append(fuzzy_val) new_data_fuzzy = np.array(new_data_fuzzy).reshape(1,-1)

import pandas as pd import numpy as np from sklearn.preprocessing import StandardScaler from sklearn.model_selection import train_test_split from sklearn.ensemble import RandomForestClassifier import ...

# 输入特征值 x = np.array(['x.sbq':0 , 'x.tobacco':2.3 , 'x.ldl':3 , 'x.adiposity':0 , 'x.famhist':0 , 'x.typea':0 ,'x.obesity':0 ,'x.alcohol':0 ,'x.age':45]) # 使用随机森林分类器预测 pred = dec_rf.predict_proba(x)

import numpy as np import pandas as pd from sklearn.preprocessing import StandardScaler from sklearn.ensemble import RandomForestClassifier # 输入特征值 x = np.array(['x.sbq':0 , 'x.tobacco':2.3 , 'x...

使用pandas包导入train.csv数据，使用sklearn包分别采用KNN,决策树，随机森林，朴素贝叶斯, SVM, XGboost (最后两个选做)等对汽车消费群体的客户进行分类，并分析哪个分类器效果好

import numpy as np from sklearn.model_selection import train_test_split from sklearn.neighbors import KNeighborsClassifier from sklearn.tree import DecisionTreeClassifier from sklearn.ensemble import...

波士顿房价预测（随机森林和线性回归）

from sklearn.ensemble import RandomForestRegressor rf = RandomForestRegressor(n_estimators=100, random_state=42) rf.fit(X_train_scaled, y_train) 接下来，我们使用测试集对模型进行评估。 python...

用澳大利亚信贷批准数据集中的690个样本作为数据集，编写python代码分别用逻辑回归模型和随机森林模型，向量机模型构建识别模型，特征选择并用准确度召回率F1和混淆矩阵可视化等指标分别对不同模型进行评估

import numpy as np from sklearn.model_selection import train_test_split from sklearn.preprocessing import StandardScaler from sklearn.linear_model import LogisticRegression from sklearn.ensemble ...

python代码：导入基因型数据是离散型变量，使用独热编码方法（categories='auto’）进行数据类型转换，数据集的大小为2504；第一列分类标签为group，一共是5个分类（AFR,EUR,SAS,AMR,EAS），进行分类编码；除去group之外共有1750个特征；基于随机森林算法，通过One Vs Rest Classfier分类策略进行嵌入式Embedded特征选择，甄选出候选特征，输出结果csv文件，通过学习曲线找出最佳阈值，使用学习曲线来评估模型的性能；对特征选择后的特征进一步遴选，绘制学习曲线以表示随机森林分类模型使用不同特征数量时的十折交叉验证分类正确率。

import pandas as pd from sklearn.preprocessing import OneHotEncoder from sklearn.ensemble import RandomForestClassifier from sklearn.multiclass import OneVsRestClassifier from sklearn.model_selection ...

【java毕业设计】校内跑腿业务系统源码（springboot+vue+mysql+说明文档）.zip

项目经过测试均可完美运行！环境说明：开发语言：java jdk：jdk1.8 数据库：mysql 5.7+ 数据库工具：Navicat11+ 管理工具：maven 开发工具：idea/eclipse

相关推荐

机器学习的算法(python).zip

Python实现随机森林回归模型：从入门到精通，预测未来如此简单

随机森林回归：Python构建稳健预测模型的6大技巧

# 输入特征值 x = np.array(['x.sbq':0 , 'x.tobacco':2.3 , 'x.ldl':3 , 'x.adiposity':0 , 'x.famhist':0 , 'x.typea':0 ,'x.obesity':0 ,'x.alcohol':0 ,'x.age':45]) # 使用随机森林分类器预测 pred = dec_rf.predict_proba(x)

使用pandas包导入train.csv数据，使用sklearn包分别采用KNN,决策树，随机森林，朴素贝叶斯, SVM, XGboost (最后两个选做)等对汽车消费群体的客户进行分类，并分析哪个分类器效果好

波士顿房价预测（随机森林和线性回归）

用澳大利亚信贷批准数据集中的690个样本作为数据集，编写python代码分别用逻辑回归模型和随机森林模型，向量机模型构建识别模型，特征选择并用准确度召回率F1和混淆矩阵可视化等指标分别对不同模型进行评估

【java毕业设计】校内跑腿业务系统源码（springboot+vue+mysql+说明文档）.zip

最新推荐

【java毕业设计】校内跑腿业务系统源码（springboot+vue+mysql+说明文档）.zip

【java毕业设计】大学志愿填报系统源码（springboot+vue+mysql+说明文档）.zip

基于java的网吧管理系统答辩PPT.pptx

Aspose资源包：转PDF无水印学习工具

管理建模和仿真的文件

【R语言高性能计算秘诀】：代码优化，提升分析效率的专家级方法

在构建视频会议系统时，如何通过H.323协议实现音视频流的高效传输，并确保通信的稳定性？

Go语言控制台输入输出操作教程

"互动学习：行动中的多样性与论文攻读经历"

【R语言机器学习新手起步】：caret包带你进入预测建模的世界