提取对象：原始数据（特征提取一般是在特征选择之前） 提取目的：自动地构建新的特征，将原始数据转换为一组具有明显物理 意义（比如几何特征、纹理特征）或者统计意义的特征。 常用方法 降维方面的PCA、ICA、LDA等 图像方面的SIFT、Gabor、HOG等 文本方面的词袋模型、词嵌入模型等 3. 特征提取 18 许永洪,吴林颖.中国各地区人口特征和房价波动的动态关系[J].统计研究,2019 统计研究,2019,36(01) 2. ICA(Independent Component Analysis，独立成分分析) ICA独立成分分析，获得的是相互独立的属性。ICA算法本质寻找一 个线性变换 ? = ??，使得 ? 的各个特征分量之间的独立性最大。 PCA 对数据 进行降维 ICA 来从多 个维度分离 出有用数据 步骤 PCA 是 ICA 的数据预处理方法 降维 3. 特征提取

authorities (rCAs), and optionally a set of intermediate certificate authorities (iCAs). An MSP’s iCA certificates must be signed by exactly one of the MSP’s rCAs or iCAs. An MSP’s configuration may contain root certificate authorities are listed in the CRL, then the MSP’s configuration must not include any iCA that is also included in the CRL, or the MSP setup will fail. Each rCA is the root of a certification rCA2 rCA3 / \ | | iCA1 iCA2 iCA3 id / \ | | iCA11 iCA12 id id | id The default MPS implementation

authorities (rCAs), and optionally a set of intermediate certificate authorities (iCAs). An MSP’s iCA certificates must be signed by exactly one of the MSP’s rCAs or iCAs. An MSP’s configuration may contain root certificate authorities are listed in the CRL, then the MSP’s configuration must not include any iCA that is also included in the CRL, or the MSP setup will fail. Each rCA is the root of a certification rCA2 rCA3 / \ | | iCA1 iCA2 iCA3 id / \ | | iCA11 iCA12 id id | id The default MPS implementation

authorities (rCAs), and optionally a set of intermediate certificate authorities (iCAs). An MSP’s iCA certificates must be signed by exactly one of the MSP’s rCAs or iCAs. An MSP’s configuration may contain root certificate authorities are listed in the CRL, then the MSP’s configuration must not include any iCA that is also included in the CRL, or the MSP setup will fail. Each rCA is the root of a certification rCA2 rCA3 / \ | | iCA1 iCA2 iCA3 id / \ | | iCA11 iCA12 id id | id The default MPS implementation

业务性能和日志之间的选择，出现阻塞，丢弃日志保性能 ü方案二 • 使用主题订阅模式，减少阻塞问题Istio_Ca——安全证书管理（ICA） u证书生成 u证书挂载 u证书过期证书生成 ü生成root-cert.pem ü生成cert-chain.pem ü生成key.pem证书挂载 üICA以Name为istio.default在k8s创建Secrets对象 ü应用服务获取Secrets对象证书，并挂载到/etc/certs

authorities (rCAs), and optionally a set of intermediate certificate authorities (iCAs). An MSP’s iCA certificates must be signed by exactly one of the MSP’s rCAs or iCAs. An MSP’s configuration may contain root certificate authorities are listed in the CRL, then the MSP’s configuration must not include any iCA that is also included in the CRL, or the MSP setup will fail. Each rCA is the root of a certification rCA2 rCA3 / \ | | iCA1 iCA2 iCA3 id / \ | | iCA11 iCA12 id id | id The default MPS implementation

authorities (rCAs), and optionally a set of intermediate certificate authorities (iCAs). An MSP’s iCA certificates must be signed by exactly one of the MSP’s rCAs or iCAs. An MSP’s configuration may contain root certificate authorities are listed in the CRL, then the MSP’s configuration must not include any iCA that is also included in the CRL, or the MSP setup will fail. Each rCA is the root of a certification rCA2 rCA3 / \ | | iCA1 iCA2 iCA3 id / \ | | iCA11 iCA12 id id | id The default MPS implementation

authorities (rCAs), and optionally a set of intermediate certificate authorities (iCAs). An MSP’s iCA certificates must be signed by exactly one of the MSP’s rCAs or iCAs. An MSP’s configuration may contain root certificate authorities are listed in the CRL, then the MSP’s configuration must not include any iCA that is also included in the CRL, or the MSP setup will fail. Each rCA is the root of a certification rCA2 rCA3 / \ | | iCA1 iCA2 iCA3 id / \ | | iCA11 iCA12 id id | id The default MPS implementation

authorities (rCAs), and optionally a set of intermediate certificate authorities (iCAs). An MSP’s iCA certificates must be signed by exactly one of the MSP’s rCAs or iCAs. An MSP’s configuration may contain root certificate authorities are listed in the CRL, then the MSP’s configuration must not include any iCA that is also included in the CRL, or the MSP setup will fail. Each rCA is the root of a certification rCA2 rCA3 / \ | | iCA1 iCA2 iCA3 id / \ | | iCA11 iCA12 id id | id The default MPS implementation

authorities (rCAs), and optionally a set of intermediate certificate authorities (iCAs). An MSP’s iCA certificates must be signed by exactly one of the MSP’s rCAs or iCAs. An MSP’s configuration may contain root certificate authorities are listed in the CRL, then the MSP’s configuration must not include any iCA that is also included in the CRL, or the MSP setup will fail. Each rCA is the root of a certification rCA2 rCA3 / \ | | iCA1 iCA2 iCA3 id / \ | | iCA11 iCA12 id id | id The default MPS implementation