mirtorch.alg.power_iter

mirtorch.alg.power_iter(A, x0, max_iter=100, tol=1e-06, alert=True)

Use power iteration to calculate the spectral norm of a LinearMap.

Parameters:

• A – a LinearMap

• max_iter – maximum number of iterations

• tol – stopping tolerance

• x0 – initial guess of singular vector corresponding to max singular value

Returns:

The spectral norm (x) and the principal right singular vector (sig1)