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Published byWhitney Holland Modified over 9 years ago
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Supervised Learning: Perceptrons and Backpropagation
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Connectionist /ism== Parallel Distributed Processing (PDP)
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Intelligence is emergent
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Used to train multilayer feedforward networks
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Assumes a continuous activation function
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Used to train multilayer feedforward networks Assumes a continuous activation function Delta rule
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Perceptron update rule was: Backprop update rule is:
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Error of an output node:
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Error of a hidden node:
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demo
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Encoding / Feature Extraction # neurons used # layers used Output mapping
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Classification
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Pattern Recognition
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Classification Pattern Recognition Content Addressable Memory
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Classification Pattern Recognition Content Addressable Memory Prediction
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Classification Pattern Recognition Content Addressable Memory Prediction Optimization
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Classification Pattern Recognition Content Addressable Memory Prediction Optimization Filtering
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Degrade gracefully
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Solve ill-defined problems
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Degrade gracefully Solve ill-defined problems Flexible
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Degrade gracefully Solve ill-defined problems Flexible Generalization
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Time & Memory
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Black box
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Time & Memory Black box Trial and Error
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If you can draw a flow chart or formula
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If a piece of hardware or software already exists that does what you want
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If you can draw a flow chart or formula If a piece of hardware or software already exists that does what you want If you want to functionality to evolve
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If you can draw a flow chart or formula If a piece of hardware or software already exists that does what you want If you want to functionality to evolve Precise answers are required
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If you can draw a flow chart or formula If a piece of hardware or software already exists that does what you want If you want to functionality to evolve Precise answers are required The problem could be described in a lookup table
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You can define a correct answer
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You have a lot of training data with examples of right and wrong answers
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You can define a correct answer You have a lot of training data with examples of right and wrong answers You have lots of data but can’t figure how to map it to output
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You can define a correct answer You have a lot of training data with examples of right and wrong answers You have lots of data but can’t figure how to map it to output The problem is complex but solvable
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You can define a correct answer You have a lot of training data with examples of right and wrong answers You have lots of data but can’t figure how to map it to output The problem is complex but solvable The solution is fuzzy or might change slightly
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2007 Rechnender Raum’s Inverted MachineInverted Machine
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Jonathan McCabe’s Nervous States 2006 Each pixel is the Output state of a Neural network given Different inputs
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2007 Phillip Stearns AANN: Artificial Analog Neural Network
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