对下面代码进行结果分析import numpy as np from sklearn.cluster import MiniBatchKMeans from sklearn.datasets import load_iris from sklearn import preprocessing import matplotlib.pyplot as plt np.random.seed(5) from sklearn.cluster import KMeans from sklearn.metrics import silhouette_score from pylab import mpl # 设置显示中文字体 mpl.rcParams["font.sans-serif"] = ["SimHei"] # 设置正常显示符号 mpl.rcParams["axes.unicode_minus"] = False # 加载鸢尾花数据集 iris = load_iris() X = iris.data y = iris.target #最小最大标准化 min_max_scaler = preprocessing.MinMaxScaler() X_minmax=min_max_scaler.fit_transform(X) batch_size =15 num_cluster =3 #K均值算法拟合 clf=MiniBatchKMeans(n_clusters=num_cluster,batch_size=batch_size,init="random") clf.fit(X_minmax) #拟合中心 centers = clf.cluster_centers_ #预测标签 pre_clu=clf.labels_ print(pre_clu) vmarker={0:'^',1:'s',2:'D',} mValue=[vmarker[i] for i in pre_clu] for _marker, _x, _y in zip(mValue, X_minmax[:,1],X_minmax[:,2]): plt.scatter(_x, _y,marker=_marker,c="grey") plt.scatter(centers[:,1],centers[:,2],marker="*",s=200,c='black') plt.show() # 轮廓系统法最佳k值 def sc_k(): K = range(2, 10) score = [] for k in K: kmeans = KMeans(n_clusters=k) kmeans.fit(iris.data) score.append(silhouette_score(iris.data, kmeans.labels_, metric='euclidean')) plt.plot(K, score, 'r*-') plt.xlabel('k') plt.ylabel(u'轮廓系数') plt.title(u'轮廓系数确定最佳的K值') plt.show() sc_k()

PCA.zip_PCA散点图_Python PCA_python pca 画图_python 图_降维

from sklearn.datasets import load_iris from sklearn.decomposition import PCA 接下来，加载鸢尾花数据集： python iris = load_iris() X = iris.data y = iris.target 在进行PCA之前，我们通常会...

解释如下代码：import numpy as np import matplotlib.pyplot as plt from sklearn.linear_model import LinearRegression from sklearn.datasets import make_regression from sklearn.model_selection import train_test_split from sklearn.preprocessing import StandardScaler from sklearn.metrics import mean_squared_error

这段代码是导入了一些 Python 的第三方库，其作用如下： 1. numpy：Python 数组计算库，提供了高效的数组运算功能。 2. matplotlib.pyplot：Python 绘图库，用于绘制图形和数据可视化。 3. sklearn.linear_...

import numpy as np import matplotlib.pyplot as plt import pandas as pd import seaborn as sns from sklearn.datasets import load_boston from sklearn.model_selection import train_test_split from sklearn.linear_model import LinearRegression from sklearn import metrics from sklearn import preprocessing

你给出的是 Python 的代码，我看到你正在使用一些流行的 Python 库，如 NumPy、matplotlib、pandas 和 seaborn，以及一些机器学习相关的库，如 scikit-learn。这些库都是非常有用的，能够帮助你进行数据分析、可视化...

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

运行上述代码需要安装以下Python包： - scikit-learn：提供了机器学习算法和工具，包括模型选择、特征提取、预处理等。可以使用pip install scikit-learn进行安装。 - pandas：提供了高性能、易于使用的数据结构...

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....

from sklearn.datasets import load_boston import numpy as np import pandas as pd import matplotlib.pyplot as plt from sklearn.linear_model import LassoCV import seaborn as sns from sklearn.preprocessing import StandardScaler from sklearn.model_selection import train_test_split

其中，load_boston函数用于加载波士顿房价数据集，LassoCV是一种线性回归模型，可以进行自动特征选择和正则化，StandardScaler用于对数据进行标准化处理，train_test_split用于将数据集划分为训练集和测试集。

from sklearn.datasets import make_moons from sklearn.preprocessing import PolynomialFeatures from sklearn.linear_model import LogisticRegression import matplotlib.pyplot as plt import numpy as np，这些程序是用来干什么的？

这些程序是用来实现一个简单的分类器，该分类器可以对二元分类问题进行建模。具体来说，该程序使用make_moons函数生成一些带有噪声的二元分类数据，然后使用...最后，使用matplotlib.pyplot和numpy库可视化分类结果。

import numpy as np #矩阵操作函数库 import matplotlib.pyplot as plt #Matplotlib是Python的一个绘图库，是Python中最常用的可视化工具之一，可以非常方便地创建2D图表和一些基本的3D图表。 import pandas as pd #数据预处理库 import seaborn as sns # from sklearn.datasets import load_boston from sklearn.model_selection import train_test_split from sklearn.linear_model import LinearRegression from sklearn import metrics from sklearn import preprocessing

1. numpy：是Python的一个数值计算库，提供了许多高级数学函数和矩阵操作函数，可以方便地进行科学计算和数据分析。 2. matplotlib.pyplot：是Python的一个绘图库，可以用来绘制各种图表，如折线图、散点图、柱状图...

import numpy as np from sklearn.cluster import MiniBatchKMeans from sklearn.datasets import load_iris from sklearn import preprocessing import matplotlib.pyplot as plt from pylab import mpl from sklearn.cluster import KMeans from sklearn.metrics import silhouette_score from scipy.spatial.distance import cdist # 设置显示中文字体 mpl.rcParams["font.sans-serif"] = ["SimHei"] # 设置正常显示符号 mpl.rcParams["axes.unicode_minus"] = False np.random.seed(5) iris = load_iris() X = iris.data y = iris.target min_max_scaler = preprocessing.MinMaxScaler() X_minmax = min_max_scaler.fit_transform(X) batch_size = 15 num_cluster = 3 clf = MiniBatchKMeans(n_clusters=num_cluster, batch_size=batch_size, init='random') clf.fit(X_minmax) centers = clf.cluster_centers_ pre_clu = clf.labels_ vmarker = {0: '^', 1: 's', 2: 'D', } mValue = [vmarker[i] for i in pre_clu] for _marker, _x, _y in zip(mValue, X_minmax[:, 1], X_minmax[:, 2]): plt.scatter(_x, _y, marker=_marker,c='grey') plt.scatter(centers[:, 1], centers[:, 2], marker='',s=200,c='black') plt.show() #手肘法则最佳k值 def sse_k(): K = range(1, 10) sse_result = [] for k in K: kmeans = KMeans(n_clusters=k) kmeans.fit(iris.data) sse_result.append(sum(np.min(cdist(iris.data, kmeans.cluster_centers_, 'euclidean'), axis=1)) / iris.data.shape[0]) plt.plot(K, sse_result, 'gx-') plt.xlabel('k') plt.ylabel(u'平均畸变程度') plt.title(u'肘部法则确定最佳的K值') plt.show() # 轮廓系统法最佳k值 def sc_k(): K = range(2, 10) score = [] for k in K: kmeans = KMeans(n_clusters=k) kmeans.fit(iris.data) score.append(silhouette_score(iris.data, kmeans.labels_, metric='euclidean')) plt.plot(K, score, 'r-') plt.xlabel('k') plt.ylabel(u'轮廓系数') plt.title(u'轮廓系数确定最佳的K值') plt.show() sse_k() sc_k()

这段代码实现了对 iris 数据集进行聚类分析的功能。具体来说，它使用了 MiniBatchKMeans 算法对 iris 数据进行聚类，并使用了肘部法则和轮廓系数法来确定最佳的聚类数量 k。首先，代码将 iris 数据集导入，然后...

import tensorflow as tf import numpy as np import matplotlib.pyplot as plt import pandas as pd from sklearn.utils import shuffle from sklearn.preprocessing import scale df = pd.read_csv("C:\\boston.csv",header=0) ds = df.values from sklearn.datasets import load_boston boston = load_boston() X = boston.data y = boston.target from sklearn.model_selection import train_test_split X_train, X_test, y_train, y_test = train_test_split(X, y, test_size=0.2, random_state=42) from sklearn.preprocessing import StandardScaler scaler = StandardScaler() X_train = scaler.fit_transform(X_train) X_test = scaler.transform(X_test) from tensorflow.keras.models import Sequential from tensorflow.keras.layers import Dense model = Sequential([ Dense(64, activation='relu', input_shape=(X_train.shape[1],)), Dense(64, activation='relu'), Dense(64, activation='relu'), Dense(1) ]) model.compile(loss='mean_squared_error', optimizer='adam') history = model.fit(X_train, y_train, validation_split=0.1, epochs=100, batch_size=32) from sklearn.metrics import mean_squared_error y_pred = model.predict(x_test)mse = mean_squared_error(y_test, y_pred)print('MSE:’, mse) import matplotlib.pyplot as plt plt.plot(history.history['accuracy'], label='train') plt.plot(history.history['val_accuracy'], label='validation') plt.legend() plt.show()

import numpy as np import matplotlib.pyplot as plt import pandas as pd from sklearn.utils import shuffle from sklearn.preprocessing import scale 然后，读取波士顿房价数据集并对其进行预处理： ...

import numpy as np import matplotlib.pyplot as plt from sklearn.datasets import load_iris from sklearn.model_selection import train_test_split from sklearn.svm import SVC from sklearn.metrics import accuracy_score # 加载鸢尾花数据集 iris = load_iris() X = iris.data y = iris.target # 数据可视化 - 处理前 plt.scatter(X[:, 0], X[:, 1], c=y) plt.xlabel('Sepal Length') plt.ylabel('Sepal Width') plt.title('Iris Dataset - Before Preprocessing') plt.show() # 划分数据集为训练集和测试集 X_train, X_test, y_train, y_test = train_test_split(X, y, test_size=0.2, random_state=42) # 创建并拟合支持向量机模型 model = SVC() model.fit(X_train, y_train) # 在测试集上进行预测 y_pred = model.predict(X_test) # 计算准确度 accuracy = accuracy_score(y_test, y_pred) print('Accuracy:', accuracy) # 数据可视化 - 处理后 plt.scatter(X_test[:, 0], X_test[:, 1], c=y_pred) plt.xlabel('Sepal Length') plt.ylabel('Sepal Width') plt.title('Iris Dataset - After Preprocessing') plt.show()

代码中首先加载了鸢尾花数据集，然后对数据集进行了可视化处理，接着将数据集划分为训练集和测试集，使用SVM算法对训练集进行拟合，并在测试集上进行预测，最后计算了模型的准确度，并使用数据可视化展示了预测结果...

请在jupyter中，完成并补全以下任务代码：作业：考虑Breast_Cancer-乳腺癌数据集总类别数为2 特征数为30 样本数为569（正样本212条，负样本357条）特征均为数值连续型、无缺失值 (1)使用GridSearchCV搜索单个DecisionTreeClassifier中max_samples,max_features,max_depth的最优值。 (2)使用GridSearchCV搜索BaggingClassifier中n_estimators的最佳值。 (3)考虑BaggingClassifier中的弱分类器使用SVC（可以考虑是否使用核函数），类似步骤(1),(2)，自己调参（比如高斯核函数的gamma参数,C参数），寻找最优分类结果。 from sklearn.datasets import load_breast_cancer from sklearn.preprocessing import StandardScaler from sklearn.model_selection import train_test_split from sklearn.tree import DecisionTreeClassifier from sklearn.ensemble import RandomForestClassifier import numpy as np import matplotlib.pyplot as plt from matplotlib.colors import ListedColormap ds_breast_cancer = load_breast_cancer() X=ds_breast_cancer.data y=ds_breast_cancer.target # draw sactter f1 = plt.figure() cm_bright = ListedColormap(['r', 'b', 'g']) ax = plt.subplot(1, 1, 1) ax.set_title('breast_cancer') ax.scatter(X[:, 0], X[:, 1], c=y, cmap=cm_bright, edgecolors='k') plt.show()

from sklearn.tree import DecisionTreeClassifier from sklearn.model_selection import GridSearchCV # 数据预处理 sc = StandardScaler() X_std = sc.fit_transform(X) # 定义模型 tree = ...

import pandas as pd import numpy as np import matplotlib.pyplot as plt import seaborn as sns from pandas_profiling import ProfileReport from sklearn import datasets from mpl_toolkits.mplot3d import Axes3D from sklearn.decomposition import PCA from sklearn.preprocessing import StandardScaler data=pd.read_csv('H:/analysis_results/mean_HN.csv') columns=['folder', 'volume', 'convex_volume', 'surface_area','length','max_width', 'max_depth'] data.head() values=data.iloc[:,1:7] correlation=values.corr() fig,ax=plt.subplots(figsize=(12,10)) sns.heatmap(correlation,annot=True,annot_kws={'size':16},cmap='Reds',square=True,ax=ax) sns.pairplot(data,hue='folder') plt.show()如何保存这两张图

你可以在代码的最后添加以下语句来保存这两张图： python fig.savefig('heatmap.png') sns_plot = sns.pairplot(data,hue='folder') sns_plot.savefig('pairplot.png') 这将会把热力图保存为 heatmap.png...

import numpy as np import matplotlib.pyplot as plt from sklearn.datasets import make_moons from sklearn.linear_model import LogisticRegression from sklearn.preprocessing import PolynomialFeatures # 生成非线性数据集 X, y = make_moons(n_samples=100, noise=0.15, random_state=42) # 进行多项式特征转换 poly = PolynomialFeatures(degree=20) X_poly = poly.fit_transform(X) # 训练LogisticRegression模型 clf = LogisticRegression() clf.fit(X_poly, y) # 绘制分类结果 xx, yy = np.meshgrid(np.linspace(-1.5, 2.5, 100), np.linspace(-1, 1.5, 100)) Z = clf.predict(poly.transform(np.c_[xx.ravel(), yy.ravel()])) Z = Z.reshape(xx.shape) plt.contourf(xx, yy, Z, cmap=plt.cm.Spectral, alpha=0.8) plt.scatter(X[:,0], X[:,1], c=y, cmap=plt.cm.Spectral) plt.show(在模型中分别加入’l1’和’l2’正则项，观察决策边界的变化情况，以及训练集和测试集分数，体会两种正则项对模型的作用。)

好的，您的问题是如何在模型中分别加入'l1'和'l2'正则项，观察决策边界的变化情况，以及训练集和测试集分数，体会两种正则项对模型的作用。可以通过LogisticRegression模型的参数penalty来设置正则项类型，'l1'...

import numpy as np import matplotlib.pyplot as plt from sklearn.datasets import fetch_openml from sklearn.preprocessing import StandardScaler, OneHotEncoder from sklearn.linear_model import LassoCV from sklearn.model_selection import train_test_split # 加载数据集 abalone = fetch_openml(name='abalone', version=1, as_frame=True) # 获取特征和标签 X = abalone.data y = abalone.target # 对性别特征进行独热编码 gender_encoder = OneHotEncoder(sparse=False) gender_encoded = gender_encoder.fit_transform(X[['Sex']]) # 特征缩放 scaler = StandardScaler() X_scaled = scaler.fit_transform(X.drop('Sex', axis=1)) # 合并编码后的性别特征和其他特征 X_processed = np.hstack((gender_encoded, X_scaled)) # 划分训练集和测试集 X_train, X_test, y_train, y_test = train_test_split(X_processed, y, test_size=0.2, random_state=42) # 初始化Lasso回归模型 lasso = LassoCV(alphas=[1e-4], random_state=42) # 随机梯度下降算法迭代次数和损失函数值 n_iterations = 200 losses = [] for iteration in range(n_iterations): # 随机选择一个样本 random_index = np.random.randint(len(X_train)) X_sample = X_train[random_index].reshape(1, -1) y_sample = y_train[random_index].reshape(1, -1) # 计算目标函数值与最优函数值之差 lasso.fit(X_sample, y_sample) loss = np.abs(lasso.coef_ - lasso.coef_).sum() losses.append(loss) # 绘制迭代效率图 plt.plot(range(n_iterations), losses) plt.xlabel('Iteration') plt.ylabel('Difference from Optimal Loss') plt.title('Stochastic Gradient Descent Convergence') plt.show()上述代码报错，请修改

import matplotlib.pyplot as plt from sklearn.datasets import fetch_openml from sklearn.preprocessing import StandardScaler, OneHotEncoder from sklearn.linear_model import LassoCV from sklearn....

from sklearn.neighbors import KNeighborsClassifier from sklearn.datasets import load_digits from sklearn import svm, metrics from sklearn.model_selection import train_test_split import matplotlib.pyplot as plt from sklearn.metrics import confusion_matrix from sklearn.metrics import plot_confusion_matrix import numpy as np #使绘图支持中文字符 from matplotlib import rcParams rcParams['font.family'] = 'SimHei' plt.rcParams['axes.unicode_minus'] = False # In[2]: digits = load_digits() data = digits.data print(data[0]) print(digits.images[0]) print(digits.target[0]) plt.imshow(digits.images[0]) plt.show() train_x, test_x, train_y, test_y = train_test_split(data, digits.target, test_size=0.3, random_state=93) print(train_x) knn = KNeighborsClassifier(n_neighbors=5) knn.fit(train_x, train_y) print("KNN训练集得分: %.4lf" % knn.score(train_x, train_y)) print("KNN测试集得分: %.4lf" % knn.score(test_x, test_y)) print(knn.predict(data)) plot_confusion_matrix(knn, test_x, test_y) plt.show() # In[5]: ################################################################# fig = plt.figure(figsize=(6,13)) for i in range(40): y_pred = knn.predict([data[i]]) plt.subplot(8,5,i+1) plt.imshow(digits.images[i], interpolation='none') plt.title("%d---->%d"%(digits.target[i],y_pred)) plt.show() 帮我修改一下代码，让测试集结果更准确

from sklearn.preprocessing import StandardScaler scaler = StandardScaler() train_x_scaled = scaler.fit_transform(train_x) test_x_scaled = scaler.transform(test_x) knn = KNeighborsClassifier(n_...

YOLO算法-城市电杆数据集-496张图像带标签-电杆.zip

YOLO系列算法目标检测数据集，包含标签，可以直接训练模型和验证测试，数据集已经划分好，包含数据集配置文件data.yaml，适用yolov5,yolov8,yolov9,yolov7,yolov10,yolo11算法；包含两种标签格:yolo格式（txt文件）和voc格式（xml文件），分别保存在两个文件夹中，文件名末尾是部分类别名称; yolo格式：<class> <x_center> <y_center> <width> <height>，其中： <class> 是目标的类别索引（从0开始）。 <x_center> 和 <y_center> 是目标框中心点的x和y坐标，这些坐标是相对于图像宽度和高度的比例值，范围在0到1之间。 <width> 和 <height> 是目标框的宽度和高度，也是相对于图像宽度和高度的比例值；【注】可以下拉页面，在资源详情处查看标签具体内容；

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