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从数据科学的角度学习统计学

Transfered from: https://docs.microsoft.com/en-us/azure/machine-learning/studio-module-reference/pca-based-anomaly-detectionPrincipal Component Analysis, which is frequently abbreviated to PCA, is an established technique in machine learning. PCA is frequ

目录题目符号微分法（失败）Pytorch自动微分小结题目符号微分法（失败）算不出来。Hessian阵算出来是个常数，不知道怎么做：import numpy as npdef f(x): prod1 = 0.2* np.matmul(x,x.transpose()) # 1/2x^tx A = np.array([[5,1,0,0.5],[1,4,0.5,0],[0,0.5,3,0],[0.5,0,0,2]]) prod2 = np.matmul(x.transpose(