Neural Networks The Undiscovered Country Jonathan Y Clark

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Neural Networks…. …. The Undiscovered Country ? Jonathan Y. Clark Department of Computing University

Neural Networks…. …. The Undiscovered Country ? Jonathan Y. Clark Department of Computing University of Surrey j. y. clark@surrey. ac. uk

Conventional Programs • • If …then … Inflexible Extremely precise Do not deal easily

Conventional Programs • • If …then … Inflexible Extremely precise Do not deal easily with ‘fuzzy’ data

Neural Networks • Able to deal with ‘fuzzy’ data • Able to learn from

Neural Networks • Able to deal with ‘fuzzy’ data • Able to learn from experience • Able to generalise

Natural Networks • Simple NNNs: Coelenterates (Hydra) • Higher Animals: The Brain

Natural Networks • Simple NNNs: Coelenterates (Hydra) • Higher Animals: The Brain

A Biological Neuron

A Biological Neuron

Perceptron Example: A Simple Vision System…

Perceptron Example: A Simple Vision System…

Multilayer Perceptron

Multilayer Perceptron

Artificial Neural Networks • SUPERVISED (for identifying) • UNSUPERVISED (for classifying)

Artificial Neural Networks • SUPERVISED (for identifying) • UNSUPERVISED (for classifying)

Self-Organising Map (SOM)

Self-Organising Map (SOM)

Lithops (Living Stones)

Lithops (Living Stones)

Conclusions and Summary Artificial Neural Networks (ANNs) are : - • • • FUN

Conclusions and Summary Artificial Neural Networks (ANNs) are : - • • • FUN (definitely!) NOVEL (almost…. . ) USEFUL (especially if expert unavailable) A link between Biology and Computing A step in the direction of ‘thinking’ machines…

Credits: Star trek pictures http: //www. screenthemes. com/ (except UC_102_3. jpg from http: //stardock.

Credits: Star trek pictures http: //www. screenthemes. com/ (except UC_102_3. jpg from http: //stardock. hispeed. com/) and Paramount Inc. Hydra pictures http: //www. microscopyu. com/ moviegallery/pondscum /coelenterata/hydra/ Nerve cell picture www. sp. uconn. edu/ ~bi 102 vc/102 f 00/terry/ That’s All Folks! (Bugs Bunny Copyright Warner Bros. )

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