from sklearn import tree import pandas as pd import numpy as np from sklearn.model_selection import train_test_split data = pd.read_csv( 'final_data1.csv') Y = data.y X = data.drop('y', axis=1) xmin = X.min(axis=0) xmax = X.max(axis=0) X_norm = (X-xmin)/(xmax-xmin) X_train, X_test, y_train, y_test = train_test_split(X_norm, Y, test_size=0.2, random_state=42) clf = tree.DecisionTreeClassifier() clf.fit(X_train, y_train) y_pred = clf.predict(X_test) y_pred= np.round(y_pred) 对上述代码进行超参数调整

import pandas as pd from sklearn.model_selection import train_test_split, GridSearchCV from sklearn.tree import DecisionTreeClassifier from sklearn.metrics import accuracy_score import numpy as np data = pd.read_csv('iris.csv', header=None, names=['sepald

3. 使用train_test_split函数将数据集划分为训练集和测试集，其中测试集占总数据集的50%。 4. 创建DecisionTreeClassifier类的实例，并将其存储在clf变量中。 5. 使用fit方法在训练集上训练决策树模型。 6. 使用...

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 import numpy as np import matplotlib.pyplot as plt import sklearn.model_selection as sM_S import sklearn.preprocessing as sP import sklearn.tree as sT import sklearn.metrics as sM import sklearn.naive_bayes as sNB #1读取数据 data_train = pd.read_excel("train data.xlsx") # 1.1剔除无关列 data = data_train.iloc[:,3:-1] #2预处理 data = data.dropna() #3.数据预处理：空值处理，值映射（分段），归一化/标准化 X = data.iloc[:,0:-1] y = data.iloc[:,-1] mms = sP.MinMaxScaler() X = mms.fit_transform(X) #4.分割数据集和测试集 x_train,x_text,y_train,y_text = sM_S.train_test_split(X,y,test_size=0.33,random_state=42) #5.选择模型 model = sT.DecisionTreeClassifier(max_depth=7) #6.训练模型 model.fit(x_train,y_train) #7.评价模型，赛事要求用F1 y_predict = model.predict(x_text) score = sM.f1_score(y_predict,y_text,average="macro") print("预处理：{} 模型：{} 参数：{} 得分：{}".format("均值填充处理_归一化","决策树","max_depth=7",score)) # 8.应用模型--预测 trainData = pd.read_excel("train data.xlsx") trainData = pd.DataFrame(trainData) trainData = trainData.iloc[:, 3:-2] trainData = trainData.dropna() # 删除空值行 val_data = trainData val_data = mms.fit_transform(val_data) print("预测 train data.xlsx 的结果为：", model.predict(val_data)) 以上这段代码能运行吗？

import sklearn.model_selection as sM_S import sklearn.preprocessing as sP import sklearn.tree as sT import sklearn.metrics as sM import sklearn.naive_bayes as sNB # 1.读取数据 data_train = pd.read_...

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....

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 fruits = pd.read_table('fruit_data_with_colors.txt') fruits.head() fruits.shape print(fruits['fruit_name'].unique()) fruits.drop('fruit_label', axis=1).hist(bins=30, figsize=(9,9)) plt.suptitle("Histogram for each numeric input variable") plt.show() feature_names = ['mass', 'width', 'height', 'color_score'] x = fruits[feature_names] y = fruits['fruit_label'] X_train, X_test, y_train, y_test = train_test_split(X, y, test_size=0.25, random_state=0) scaler = MinMaxScaler() X_train = scaler.fit_transform(X_train) X_test = scaler.transform(X_test) logreg = LogisticRegression() logreg.fit(X_train, y_train) clf = DecisionTreeClassifier().fit(X_train, y_train) knn = KNeighborsClassifier() knn.fit(X_train, y_train) svm = SVC() svm.fit(X_train, y_train) pred = knn.predict(X_test)

你给出的代码是一个简单的机器学习分类问题的示例代码，使用的是...其中，MinMaxScaler用于对数据进行归一化处理，train_test_split用于将数据集分为训练集和测试集。最后使用K近邻分类器进行预测，并输出预测结果。

import pandas as pd import numpy as np from sklearn.model_selection import train_test_split from sklearn.tree import DecisionTreeClassifier def data_input(): data=pd.read_excel('22AI1.xlsx') data=data.dropna(axis=0) data = data.reset_index(drop=True) data=data[['身高','体重']] return data # 分类瘦,中,胖为0,1,2 X=data_input() np_label=np.array([]) for h,w in zip(X.身高,X.体重): if h<=170 and w<60: np_label=np.append(np_label,'瘦') elif h>175 and w>70: np_label=np.append(np_label,'中') else: np_label=np.append(np_label,'胖') pd_label=pd.DataFrame({'标签': np_label}) print(pd_label) label=pd_label['标签'].map({'小':0,'中':1,'大':2}) print(label)为什么label会有nan

在上述代码中，标签的映射字典中只有 '小'，'中'，'大' 三个键值，而在np_label中的标签可能会包含其他的值，如 '瘦'，因此在映射过程中会产生缺失值 NaN。要解决这个问题，你需要在映射字典中加入 '瘦' 这个键，并...

import numpy as np import pandas as pd from sklearn.model_selection import train_test_split from sklearn.preprocessing import StandardScaler from sklearn.tree import DecisionTreeClassifier from sklearn.metrics import accuracy_score, precision_score, recall_score, f1_score # 加载数据 data = pd.read_csv('heart_2020_cleaned.csv') # 特征工程 X = data.drop('HeartDisease', axis=1) y = data['HeartDisease'] X_train, X_test, y_train, y_test = train_test_split(X, y, test_size=0.2, random_state=42) scaler = StandardScaler() X_train = scaler.fit_transform(X_train) X_test = scaler.transform(X_test) # 模型训练 model = DecisionTreeClassifier(max_depth=3) model.fit(X_train, y_train) # 模型评估 y_pred = model.predict(X_test) acc = accuracy_score(y_test, y_pred) precision = precision_score(y_test, y_pred) recall = recall_score(y_test, y_pred) f1 = f1_score(y_test, y_pred) print('Accuracy:', acc) print('Precision:', precision) print('Recall:', recall) print('F1:', f1)转换数值类型

data['SomeFeature'] = data['SomeFeature'].astype(float) 其中，SomeFeature表示需要转换数据类型的特征名，float表示需要转换为的数据类型。可以根据实际情况选择需要转换为的数据类型。

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 pandas as pd import numpy as np from matplotlib import pyplot as plt #2.读取数据 from sklearn.metrics import f1_score from sklearn.model_selection import train_test_split from sklearn.tree import DecisionTreeClassifier data=pd.read_excel('train_data.xlsx') #print(data) #print(np.any(data.isnull())) #3.数据预处理 data=data.drop(labels=['机器编号','统一规范代码','具体故障类别'],axis=1)#删除不需要的列 data.replace('L',1.0,inplace=True) data.replace('M',2.0,inplace=True) data.replace('H',3.0,inplace=True) data=data.dropna() #print(data) X = data.iloc[:,0:-1] y = data.iloc[:,-1] #4、分割测试集和训练集 X_train,X_test,y_train,y_test = train_test_split(X,y,test_size=0.33,random_state=40) #5、选择模型 model = DecisionTreeClassifier(max_depth=6) #6、训练模型 model.fit(X_train,y_train) #7、评价模型：要求用F1 #y_predict = model.predict(X_test) #score = f1_score(y_predict,y_test,average="macro") #plt.show() y_predict = model.predict(X_test) score = f1_score(y_predict,y_test,average="macro") print(score) 补全缺失值填充

在数据预处理的步骤中，可以对缺失值进行填充。常见的缺失值填充方法包括均值填充、中位数填充、众数填充、前向填充、后向填充、插值填充等。具体采用哪种方法，需要根据...new_data = data.fillna(data.mean())

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。...

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 """ ...

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...

fromsklearn.tree import DecisionTreeClassifier from sklearn.model_selection import train_test_split from sklearn.metrics import confusion_matrix, classification_report import numpy as npimport pandas as pd # 读取数据 df = pd.read_csv("data.csv") # 分离特征和标签 X = df.drop('Outcome', axis=1)y = df['Outcome'] # 分割数据集 X_train, X_test, y_train, y_test = train_test_split(X, y, test_size=35 / 769) # 构建决策树模型 classifier=DecisionTreeClassifier(criterion='entropy',max_depth=3, min_ weight_fraction_leaf=0.01) classifier.fit(X_train, y_train) # 模型预测 y_pred = classifier.predict(X_test) # 输出模型评估结果 print('决策树模型') print(confusion_matrix(y_test, y_pred)) print(classification_report(y_test, y_pred)) print('决策树模型预测结果:', classifier.predict(X_test)) # 输出原始数据集真实结果 y_ = np.array(y_test)print('原始数据集真实结果:', y_) # 输出模型得分 modelscore = format(classifier.score(X_test, y_test)) print('模型得分:{:.2f}'.format(classifier.score(X_test, y_test))) # 判断模型准确率是否达标 if float(modelscore) >= 0.88: print("模型预测准确率较高，适合用来预测糖尿病") else: print("模型预测准确率较低，不宜用来预测糖尿病")根据代码画决策树

from sklearn.tree import export_graphviz import graphviz dot_data = export_graphviz(classifier, out_file=None, feature_names=X.columns, class_names=['0', '1'], filled=True, rounded=True, ...

这个代码为什么输出有问题import pandas as pd import numpy as np from sklearn.model_selection import train_test_split from sklearn.preprocessing import StandardScaler from sklearn.tree import DecisionTreeClassifier from sklearn.metrics import accuracy_score, precision_score, recall_score, f1_score # 读取数据集 data = pd.read_csv('adult.csv') # 将数据集中的缺失值用平均值进行填充 data = data.fillna(data.mean()) # 将分类变量进行独热编码 data = pd.get_dummies(data) # 将目标变量进行二元编码 data['income'] = data['income'].apply(lambda x: 1 if x == '>50K' else 0) # 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(data.drop('income', axis=1), data['income'], test_size=0.2, random_state=42) # 对数据集进行标准化处理 scaler = StandardScaler() X_train = scaler.fit_transform(X_train) X_test = scaler.transform(X_test) # 使用决策树算法建立分类模型 clf = DecisionTreeClassifier() clf.fit(X_train, y_train) # 对测试集进行预测 y_pred = clf.predict(X_test) # 计算模型的准确率、精确率、召回率和F1值 accuracy = accuracy_score(y_test, y_pred) precision = precision_score(y_test, y_pred) recall = recall_score(y_test, y_pred) f1 = f1_score(y_test, y_pred) # 输出模型的评估结果 print('Accuracy:', accuracy) print('Precision:', precision) print('Recall:', recall) print('F1 Score:', f1) # 将数据集保存为csv文件 data.to_csv('adult_processed.csv', index=False)

代码本身没有明显的语法错误，但是有可能是数据集中存在缺失值导致的。在第6行中，使用平均值填充了缺失...建议在进行填充操作前，先对数据集进行缺失值检测，例如使用 data.isnull().sum() 查看每列中缺失值的数量。

import pandas as pd titanic=pd.read_csv('D:/Download/titanic-data.csv') data = pd.read_csv('D:/Download/titanic-data.csv') print(titanic.head(5)) X = titanic[['Pclass','Age','Sex']] y = titanic['Survived'] X.shape X.tail(5) X.info() mean_Age=X['Age'].mean() print(mean_Age) X['Age']=X['Age'].fillna(mean_Age) print(X.tail(5)) X['Pclass'] = X['Pclass' ].map({'1st':1, '2nd':2, '3rd':3}) X['Sex'] = X['Sex' ]. map({'female':0, 'male':1}) X. tail(5) from sklearn. preprocessing import MinMaxScaler scaler = MinMaxScaler() X_scaled = scaler.fit_transform(X) print (X_scaled) from sklearn.tree import DecisionTreeClassifier import numpy as np jack = np. array([[3, 23, 1]]) rose = np. array([[1, 20, 0]]) jack_scaled = scaler.transform (jack) rose_scaled = scaler.transform(rose) from sklearn.model_selection import train_test_split X_train, X_test, y_train, y_test = train_test_split(X_scaled, y, test_size=0.2, random_state=100) dt_clf = DecisionTreeClassifier (max_depth=2, min_samples_split=2) dt_clf.fit(X_train, y_train) print(dt_clf.predict_proba(jack_scaled) [0][1]) print (dt_clf.predict_proba(rose_scaled) [0][1])

代码中用到了pandas库进行数据读取和处理，sklearn库中的MinMaxScaler对数据进行归一化处理，DecisionTreeClassifier对数据进行分类预测。其中，jack和rose分别代表“杰克”和“罗斯”这两个角色，他们的特征数据被...

相关推荐

pd_split_train_test.rar_pandas_pandas对数据分类_pd.split_split_数据分类

详解pandas库pd.read_excel操作读取excel文件参数整理与实例

pandas.read_csv参数详解(小结)

import pandas as pd from sklearn.model_selection import train_test_split, GridSearchCV from sklearn.tree import DecisionTreeClassifier from sklearn.metrics import accuracy_score import numpy as np data = pd.read_csv('iris.csv', header=None, names=['sepald

最新推荐

什么是yolov10，简单举例.md

shufflenet模型-图像分类算法对动态表情分类识别-不含数据集图片-含逐行注释和说明文档.zip

该项目存放基于Cesium的三维GIS平台开发中各种实践程序、截图、总结等，其中程序目录结构

mobilenet模型-基于图像分类算法对猕猴桃品质识别-不含数据集图片-含逐行注释和说明文档.zip

zigbee-cluster-library-specification

管理建模和仿真的文件

深入了解MATLAB开根号的最新研究和应用：获取开根号领域的最新动态

react的函数组件的使用

JSBSim Reference Manual

"互动学习：行动中的多样性与论文攻读经历"