Feedforward Neural Networks

Feedforward Neural Networks

Danna Gurari

University of Colorado Boulder

Fall 2022



Review

? Last lecture:

?

?

?

?

Binary classification applications

Evaluating classification models

Biological neurons: inspiration

Artificial neuron: Perceptron

? Assignments (Canvas):

? Problem set 1 due earlier today (should receive grades in ~1 week)

? Lab assignment 1 due in 1.5 weeks (quick review of expectations)

? Questions?

Today¡¯s Topics

? Motivation for neural networks: need non-linear models

? Neural network architecture: hidden layers

? Neural network architecture: activation functions

? Neural network architecture: output units

? Programming tutorial

Today¡¯s Topics

? Motivation for neural networks: need non-linear models

? Neural network architecture: hidden layers

? Neural network architecture: activation functions

? Neural network architecture: output units

? Programming tutorial

Historical Context: Artificial Neurons

Machine

learning

AI

Perceptron

Turing test

First programmable machine

1943 1945 1950

19

1956

1957

59

First mathematical

model of neuron

1969

Minsky & Papert

published a book

called ¡°Perceptrons¡± to

discuss its limitations

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