NARX input delays what exactly do they mean?

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Jacob Steeves
Jacob Steeves 2014-11-30
评论： Charles 2017-8-11
Hi,
Im trying to create a neural network to time series prediction with a NARX net. My question is about the tap delays on this network.
Lets say Im using input delays 1:2 and feedback delays 1:2 with inputs X and targets T does this mean I am using the set { x(i-1),x(i-2),t(i-1),t(i-2) } to predict t(i)?
where my X = [x(1),x(2),x(3),….x(n)] and T = [t(1),t(2),t(3),…t(n)]
thanks.

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Greg Heath
Greg Heath 2014-12-8
Yes, for i >=3.
Also: note that an input delay of 0 is allowable but a feedback delay of 0 is not.
Thank you for formally accepting my answer
Greg
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Charles
Charles 2017-8-11
Thank you I believe I may have asked a question of similar nature today,so this helps. If you remove the input delay does this in effect tell the network to predict a step ahead? Is this why, output 'y' is short in length?

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