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I am trying to understand LSTM and reading colah blog , As LSTM structure looks like this :

enter image description here

So LSTM takes three inputs:

  • Input vector
  • Memory from previous block
  • Output from previous block

and return :

  • memory from current block
  • output from current block

which will become previous memory and previous block output for next state ,

My confusion is what is the initial values of ct-1 ( memory from previous block) and ht-1 ( hidden output from previous block) , since there is no previous block then what are initial values ?

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Either you use a zero vector state for both (most commonly used), or you can use other approaches such as described in this article.

I have personally always used zero vectors.

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