CLASSIFICATION AND PREDICTION - Universität Wien

Peter Brezany Institut für Softwarewissenschaft, WS 2002 6
What Is a Neural Net?
NN consists of basic units modeled on the principles of biological neurons. These units are
connected together as shown in the next figures.
Slide 11
input 1
input 2
input 3
input 4
output
output
output
1
2
3
A neural network can produce
multiple output values.
What Is a Neural Net? (2)
input 1
input 2
input 3
input 4
output
A very simple neural network
takes four inputs and produces an
output. The result of training this
network is exactly equivalent to
the statistical technique called
logistic regression.
Slide 12
input 1
input 2
input 3
input 4
output
This network has a middle layer
called the hidden layer.The
hidden layer makes the network
more powerful by enabling it to
recognize more patterns.
input 1
input 2
input 3
output
Increasing the size of the hidden
layer makes the network more
powerful but introduces the risk of
overfitting. Usually, only one
hidden layer is needed.
input 4