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The Threshold Activation Function
The Hopfield transfer function involves the same net input term which
occurs in many neural architectures (see chapter 2):
neti = 
wijai
A threshold activation function is then applied:
ai = sgn( wijai)
where:
| sgn(x) = | 1 if x >= 0
| -1 if x < 0
| |
The sgn function.