jaxopt.prox.prox_non_negative_ridge

jaxopt.prox.prox_non_negative_ridge(x, l2reg=1.0, scaling=1.0)

Proximal operator for the squared l2 norm on the non-negative orthant.

\[\underset{y \ge 0}{\text{argmin}} ~ \frac{1}{2} ||x - y||_2^2 + \text{scaling} \cdot \text{l2reg} \cdot ||y||_2^2\]

Parameters

• x (Any) – input pytree.

• l2reg (Optional[float]) – regularization strength.

• scaling (float) – a scaling factor.

Returns

output pytree, with the same structure as x.