Single-precision Gauss error function.

Computes $\text{out}_i = \mathrm{erf}(\text{in}_i)$ via vverff, where $\mathrm{erf}(x) = \tfrac{2}{\sqrt{\pi}} \int_0^x e^{-t^2} \, dt$. Used by GELU activation among others.

References

Accelerate.framework vverff.