what is dtanh in week1 assignment?
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The formula for dtanh is shown on the third line of equations, the one with to the left of (0). It’s the formula for derivative of the tanh activation function.
You can compute its value by following the equation.
Well, it’s that plus multiplying by da_{next}. Note they could have written it more simply as:
dtanh = da_{next} * \left( 1 - (a^{<t>}){^2} \right)