power_method

deepinv.physics.functional.power_method(operator, x0, max_iter=100, tol=1e-6, verbose=False, **kwargs)

Runs the power iteration method to estimate the largest singular value of a linear operator.

Parameters:

• operator (Callable) – function that applies the linear operator.

• x0 (torch.Tensor) – initial vector for the power iteration.

• max_iter (int) – maximum number of iterations. Default: 100.

• tol (float) – tolerance for convergence. Default: 1e-6.

• verbose (bool) – if True, prints convergence information. Default: False.

• kwargs – additional arguments to be passed to the operator.

Returns:

(torch.Tensor) Estimated largest singular value of the operator.