AmplitudeLoss#

class deepinv.optim.AmplitudeLoss[source]#

Bases: DataFidelity

Amplitude loss as the data fidelity term for deepinv.physics.PhaseRetrieval() reconstrunction.

In this case, the data fidelity term is defined as

$$f(x)=\sum _{i=1}^m(\sqrt{|b_{i}x{|}^2}-\sqrt{y_i}{)}^2,$$

where $b_i$ is the i-th row of the linear operator $B$ of the phase retrieval class and $y_i$ is the i-th entry of the measurements, and $m$ is the number of measurements.