import pandas as pd from sklearn.preprocessing import StandardScaler from sklearn.decomposition import PCA file_path = r'E:\XuJunjie\Dasanxia\大数据实验\实验3\实验三\1. 城市排名.txt' data = pd.read_csv(file_path,sep=',') X = data.values.reshape(-1,1) scaler = StandardScaler() X_scaled = scaler.fit_transform(X) pca = PCA(n_components=2) X_pca = pca.fit_transform(X_scaled) print(pca.components_) print(pca.explained_variance_ratio_)

这段代码是用Python中的pandas库读取一个文本文件，并将其转化为一个二维数组X。然后使用sklearn库中的StandardScaler()方法对X进行标准化处理，即均值为0，方差为1。接着使用PCA方法对标准化后的数据进行降维处理，将其降到2维，即将原来的数据压缩到一个二维的平面内。最后输出了降维后的主成分（即特征向量）和每个主成分所占的方差比例。

import pandas as pd from sklearn.model_selection import train_test_split from sklearn.neighbors import KNeighborsClassifier from sklearn.preprocessing import StandardScaler

这段代码主要是导入了一些常用的数据处理和机器学习库，包括pandas、sklearn.model_selection、sklearn.neighbors和sklearn.preprocessing。其中pandas库用于数据处理，sklearn.model_selection库用于模型选择和数据集划分，sklearn.neighbors库用于K近邻分类算法，sklearn.preprocessing库用于数据预 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 6 61 62 63 64 65 66 67 68 69 70 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 7 71 72 73 74 75 76 77 78 79 80 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 8 81 82 83 84 85 86 87 88 89 90 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 9 91 92 93 94 95 96 97 98 99 100 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 ``` 这个结果就是将列名大于 50 小于 60 的部分删除后的新矩阵。

import torch import pandas as pd from sklearn.preprocessing import LabelEncoder, OneHotEncoder

这段代码导入了三个库：torch、pandas和sklearn。torch是PyTorch深度学习框架的Python接口，pandas是一个用于数据处理和分析的Python库，sklearn则是Python中流行的机器学习库。这段代码还使用了sklearn库中的两个类：LabelEncoder和OneHotEncoder。LabelEncoder用于将文本标签转换为数字标签，OneHotEncoder则用于将数字标签转换为独热编码。这两个类通常被用于数据预处理中的特征编码。

import pandas as pd from sklearn.model_selection import train_test_split from sklearn.neighbors import KNeighborsClassifier from sklearn.preprocessing import StandardScaler

import torch import pandas as pd from sklearn.preprocessing import LabelEncoder, OneHotEncoder

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