An informal description of artificial neural networks John MacCormick.

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Presentation transcript:

An informal description of artificial neural networks John MacCormick

Decision tree for “Should I take an umbrella?”

Schematic representation of a biological neuron

Neural network for “Should I take an umbrella?”

Objective: detect sunglasses Source for sunglasses data and code: Tom Mitchell, Machine Learning, McGraw-Hill (1998).

We use an artificial neural network with a single hidden layer

Our artificial neurons compute a weighted sum followed by a non-linear threshold (actually a sigmoid)

The weights of the inputs to each neuron are tuned to produce good results on the training set

This experiment produced an 85% success rate for determining the presence of sunglasses