The Hopfield Network: Answers

Copyright © Simon Dennis, 1997.
Exercise 1: Typically, the energy will be -202. However, because activations are updated randomly it is possible for the network to have a higher energy after 100 cycles.

Exercise 2:

Pattern Energy
One -178
Two -202
Three -202
Four -166

Exercise 3: The energy is -202 exactly the same as for the non-reversed pattern.

Exercise 4:

Pattern Starting Energy Final Energy
Cut Off One -42 -178
Cut Off Four -38 -166
Noisy One -58 -178
Noisy Two -42 -202
Noisy Three -58 -202
Noisy Four -38 -166

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