xxai

摘要： 1 手写实现PCA import numpy as np class PCA(): # 计算协方差矩阵 def calc_cov(self, X): m = X.shape[0] # 数据标准化，X的每列减去列均值 X = (X - np.mean(X, axis=0)) return 1 / m 阅读全文

摘要： 1 导入相关模块 import numpy as np from collections import Counter import matplotlib.pyplot as plt from sklearn import datasets from sklearn.utils import shu 阅读全文