sigpy.prox.L2Proj

class sigpy.prox.L2Proj(shape, epsilon, y=0, axes=None)

Proximal operator for l2 norm projection.

\[\min_x \frac{1}{2} \| x - y \|_2^2 + 1\{\| x \|_2 < \epsilon\}\]

Parameters:

• shape (tuple of ints) – Input shape.
• epsilon (float) – Regularization parameter.
• y (scalar or array) – Bias term.

__init__(shape, epsilon, y=0, axes=None)

Initialize self. See help(type(self)) for accurate signature.

Methods

__init__(shape, epsilon[, y, axes])

Initialize self.