chore: import upstream snapshot with attribution

2026-07-13 13:38:23 +08:00
commit 2725b63d23
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+Unsupervised dimensionality reduction via principal component analysis 128
+  Total and explained variance
+  Feature transformation
+  Principal component analysis in scikit-learn
+Supervised data compression via linear discriminant analysis
+  Computing the scatter matrices
+  Selecting linear discriminants for the new feature subspace
+  Projecting samples onto the new feature space
+  LDA via scikit-learn
+Using kernel principal component analysis for nonlinear mappings
+  Kernel functions and the kernel trick
+  Implementing a kernel principal component analysis in Python
+    Example 1 – separating half-moon shapes
+    Example 2 – separating concentric circles
+  Projecting new data points
+  Kernel principal component analysis in scikit-learn
+Summary