SushiDSP::models

void softplus_and_logistic(double t, double &softplus_value, double &logistic_value)

Evaluates softplus and its derivative together from one exponential.

softplus() and logistic() each cost one exp(); a caller that needs both — which every device model's joint current-and-Jacobian entry point does — would otherwise pay for two. The branches are the same overflow guards the two single-value helpers carried.

double softplus(double t)

Softplus ln(1 + exp(t)), the smooth C-infinity replacement for max(0, t).

double logistic(double t)

Logistic 1 / (1 + exp(-t)), which is the derivative of softplus().