Add PCA notes.

emirkmo · Sep 24, 2023 · dbeabc1 · dbeabc1
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+# PCA
+
+Each pc is projection that "explains" maximum variance.
+Used to be good for dimensionality reduction and compression
+, especiall during training or feature selection,
+but nowadays mainly used for visualization in AI/ML.
+
+Eigen vector and eigen value for deeper understanding.
+
+Just use sklearn.
+I published a paper on this so need for more.