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Saturday, September 15, 2012

A Simple Artificial Neuron


A Simple Artificial Neuron

Our basic computational element (model neuron) is often called a node or unit. It receives input from some other units, or perhaps from an external source. Each input has an associated weight w, which can be modified so as to model synaptic learning. The unit computes some function f of the weighted sum of its inputs:
  
Its output, in turn, can serve as input to other units

 The weighted sum is called the net input to unit i, often written neti.
  • Note that wij refers to the weight from unit j to unit i (not the other way around).
  • The function f is the unit's activation function. In the simplest case, f is the identity function, and the unit's output is just its net input. This is called a linear unit. 

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