activationBackward

grad function of sigmoid/tanh ... etc wrapper

version(grain_cuda)

void

activationBackward

(

cudnnActivationMode_t A

T

size_t dim

)

(

Variable!(T, dim, DeviceStorage) gx

,

Variable!(T, dim, DeviceStorage) gy

,

Variable!(T, dim, DeviceStorage) x

,

Variable!(T, dim, DeviceStorage) y

,

T alpha = 1.0

,

T beta = 0.0

,

double coeff = 0.0

)

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