PhysicsCropper

class deepinv.physics.PhysicsCropper(physics, crop, device='cpu')

Bases: LinearPhysics

Cropping for linear physics operators.

Given a linear physics operator \(A\), this operator instantiates a new operator \(\tilde{A} = A \circ C\) where \(C\) is a cropping operator that crops the input tensor. The adjoint operator is defined as \(\tilde{A}^{\top} = C^{\top} \circ A^{\top}\) and \(C^{\top}\) is a padding operator that pads the input tensor to the original size.

Parameters:

• physics (deepinv.physics.LinearPhysics) – base linear physics operator.

• crop (tuple) – padding to apply to the input tensor, e.g., (pad_height, pad_width) or (pad_z, pad_height, pad_weight) where pad_z is either channel or depth dimension pad.

• device (torch.device, str) – cpu or cuda, every registered buffer and module parameters are recursively pushed onto the device during initialization.