ZHANG, Ruda October 25, 2019:  Notes on machine learning. [6e74cb4]
ZHANG, Ruda February 24, 2019:  Replace superscript * to ∗ [d60bd7f]
ZHANG, Ruda February 19, 2019:  PCA, SVD, learning theory; digitize notes on SVD [ce26c0a]
ZHANG, Ruda December 30, 2018:  Use dollar style math markup. [1b7036c]
ZHANG, Ruda July 31, 2018:  More on probability density estimation and manifold learning. [0fe7ce8]
ZHANG, Ruda July 10, 2018:  Add manifold learning [ba3d5e6]
ZHANG, Ruda March 23, 2018:  Global remove trailing whitespaces [2b7ff90]
ZHANG, Ruda October 15, 2017:  separate econometrics and regression inference [b2083ef]
ZHANG, Ruda October 14, 2017:  Merge computational and statistical learning. [a493a55]
Ruda Zhang July 05, 2016:  Add leaflet, QGIS; notes on decision trees. [9f2e957]
Ruda Zhang June 26, 2016:  one sentence per line [e15360a]
Ruda Zhang June 26, 2016:  add category tag to wiki pages [a9b356c]
Ruda Zhang June 26, 2016:  use canonical filename and no internal H1 [eeca8ff]