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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.