is an important tool in machine learningdata mining we must always be aware that it can distort the data in misleading ways Above is a two dimensional projection of an intrinsically three dimensional world ID: 647442
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Slide1
While
dimensionality reduction
is an important tool in machine learning/data mining, we must always be aware that it can distort the data in misleading ways.
Above is a two dimensional projection of an intrinsically three dimensional world….Slide2
Original photographer unknown
See also www.cs.gmu.edu/~
jessica/DimReducDanger.htm (c)
eamonn
keogh
Slide3
Screen dumps of a short video from
www.cs.gmu.edu
/~
jessica/DimReducDanger.htm
I recommend you imbed the original video instead
A cloud of points in 3D
Can be projected into 2D
XY
or
XZ
or
YZ
In 2D XZ we see a triangle
In 2D YZ we see a square
In 2D
XY
we see a circle