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Regression
1.
Regression CS294 Practical
Machine Learning Romain Thibaux 09/18/06
2.
3.
4.
5.
6.
7.
8.
Linear regression 0
10 20 30 40 0 10 20 30 20 22 24 26 Temperature 0 10 20 0 20 40 [start Matlab demo lecture2.m] Given examples Predict given a new point
9.
Linear regression 0
20 0 20 40 Temperature 0 10 20 30 40 0 10 20 30 20 22 24 26 Prediction Prediction
10.
Ordinary Least Squares
(OLS) 0 20 0 Error or “residual” Prediction Observation Sum squared error
11.
Minimize the sum
squared error Sum squared error Linear equation Linear system
12.
Alternative derivation n
d Solve the system (it’s better not to invert the matrix)
13.
LMS Algorithm (Least
Mean Squares) where Online algorithm
14.
Beyond lines and
planes everything is the same with still linear in 0 10 20 0 20 40
15.
Geometric interpretation [Matlab
demo] 0 10 20 0 100 200 300 400 -10 0 10 20
16.
Ordinary Least Squares
[summary] n d Let For example Let Minimize by solving Given examples Predict
17.
Probabilistic interpretation 0
20 0 Likelihood
18.
Assumptions vs. Reality
Voltage Intel sensor network data Temperature 0 1 2 3 4 5 6 7 0 0.01 0.02 0.03 0.04 0.05 0.06 0.07 0.08
19.
Overfitting 0 2
4 6 8 10 12 14 16 18 20 -15 -10 -5 0 5 10 15 20 25 30 [Matlab demo] Degree 15 polynomial
20.
Ridge Regression (Regularization)
0 2 4 6 8 10 12 14 16 18 20 -10 -5 0 5 10 15 Effect of regularization (degree 19) with “small” Minimize by solving
21.
Probabilistic interpretation Likelihood
Prior Posterior
22.
23.
Errors in Variables
(Total Least Squares) 0 0
24.
Sensitivity to outliers
High weight given to outliers Influence function 0 10 20 30 40 0 10 20 30 5 10 15 20 25 Temperature at noon
25.
L 1
Regression Linear program Influence function
26.
Kernel Regression 0
2 4 6 8 10 12 14 16 18 20 -10 -5 0 5 10 15 Kernel regression (sigma=1)
27.
Spline Regression Regression
on each interval 5200 5400 5600 5800 50 60 70
28.
Spline Regression With
equality constraints 5200 5400 5600 5800 50 60 70
29.
Spline Regression With
L 1 cost 5200 5400 5600 5800 50 60 70
30.
0 1 2
0 #requests per minute Time (days) 5000 Heteroscedasticity
31.
MARS Multivariate Adaptive
Regression Splines … on the board…
32.
Hinweis der Redaktion
Figure 1: scatter(1:20,10+(1:20)+2*randn(1,20),'k','filled'); a=axis; a(3)=0; axis(a);
Figure 1: scatter(1:20,10+(1:20)+2*randn(1,20),'k','filled'); a=axis; a(3)=0; axis(a);
Figure 1: scatter(1:20,10+(1:20)+2*randn(1,20),'k','filled'); a=axis; a(3)=0; axis(a);
Link with perceptron
A linear program is fast, but much slower than solving a linear system
Link with kNN
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