中文说明：
pca是主成分分析，提取特征，对数据进行降维处理
English Description：
PCA is principal component analysis, which extracts features and reduces the dimension of data
PCA is principal component analysis, which extracts features and reduces the dimension of data
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中文说明：
pca是主成分分析，提取特征，对数据进行降维处理
English Description：
PCA is principal component analysis, which extracts features and reduces the dimension of data
pca.m