why there is no 0.5* in the equation of the derivative of sate(t) ? about lstm HOT 4 CLOSED

Glad you find the post useful.

The chain rule of calculus says that in order to calculate the left derivative, you need to take into account all intermediate variables that are affected by changes in s_i which themselves will affect L(t). In this example the only intermediate variables are h_i(t) and h_i(t+1).

Why do you think that left = 0.5*right?

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The section called "Higher dimensions" is relevant here: https://en.wikipedia.org/wiki/Chain_rule

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@nicodjimenez hi, thanks for your reply, it's really very very kind of you.

I think in the equation bellow，

left = 0.5*right is because ：

so we can get:

in my opinion, the derivative is :

once we can get top_diff_h , we can get dsi(t)

and in your code,

if we change

ds = self.state.o * top_diff_h + top_diff_s

to

ds = self.state.o * top_diff_h 

it's more likely to get a lower loss in my test.

I don't know where is the wrong point, hope you can get more tips.

thanks for your reply again!

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This is the same point as the one made in #49. Please move discussion there.

Also, I don't follow your math:

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