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Would it be plausible to write a recursive version of backpropagation through time for recurrent neural network training? I've only found the iterative version:

http://en.wikipedia.org/wiki/Backpropagation_through_time

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    $\begingroup$ Is there a reason to care whether it is recursive or iterative? Is there a motivation or context behind what drives you to ask this question? I suspect the answer is going to be "sure, not that it makes any difference"; if that's the answer, is it going to answer your question? $\endgroup$ – D.W. May 12 '14 at 16:14
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    $\begingroup$ The algorithm is recursive in nature, it's just implemented iteratively for reasons of efficiency. See if you can figure out how to write it recursively. $\endgroup$ – Yuval Filmus May 12 '14 at 18:18

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