From dbeabc192ecbdd77bb4877887702d769f69e4ee8 Mon Sep 17 00:00:00 2001
From: Emir Karamehmetoglu <emir.k@phys.au.dk>
Date: Sun, 24 Sep 2023 11:31:39 +0200
Subject: [PATCH] Add PCA notes.

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 Course3/Notes/pca.md | 11 +++++++++++
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 create mode 100644 Course3/Notes/pca.md

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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.