The Author Online Book Forums are Moving

The Author Online Book Forums will soon redirect to Manning's liveBook and liveVideo. All book forum content will migrate to liveBook's discussion forum and all video forum content will migrate to liveVideo. Log in to liveBook or liveVideo with your Manning credentials to join the discussion!

Thank you for your engagement in the AoF over the years! We look forward to offering you a more enhanced forum experience.

627201 (9) [Avatar] Offline
#1
On the page 220, in the section 12.16 backpropagation with arbitrary length, there is a mistmatch between book description of the code and code, which explains the section, namely:


The most important object is our layers list, which has two vectors (layer['state'] and
layer['previous->hidden']). In order to backpropagate, we're going to take our output
gradient and add a new object to each list called layer['state_delta'] which is going to
represent the gradient at that layer.


First of all, there are no layer list in the code

Secondly, the variables in the code on the same page are being named as:

layer['hidden'] instead of layer['state'], and layer['hidden_delta'] instead of layer['state_delta']

I'm not able to find, to which variable the layer['previous->hidden'] refers to.