VISUALS FOR COMPUTERS VERSUS HUMANS LECTURE OF JUNE 1, 2010 (B)

Copyright ©2010 by T. Pavlidis

LEARNING MACHINE DIAGRAMS
The task is to find a straight line or segments of such lines to separate
the points maked with open circles from those marked by dark circles.

The Process of Machine Learning

The machine evaluates an expression:
u*Ch + v*Bm - w where Ch stands for cholesterol and Bm for the BMI. u, v, and w are parameters to be determined during "learning".

The expression is 0 along a straight line. Thus Line A corresponds to u equal to 1, v equal to 0 and w equal to 120. Line D corresponds to having u 0.6, v 8 and w 288. We omit the description of how the computer program modifies the parameters u, v, and w. There are well established mathematical methods for doing that and their overall effect is equivalent to modifying the position and orientation of the line.

Designing a Medical Diagnostic Program using Machine Learning.
(Caution: This is only a toy example, not a real system. It has nothing to do with real medical diagnostics.)