Defining New Operators

Defining a new forward operator is relatively simple. You need to create a new class that inherits from the right physics class, that is deepinv.physics.Physics() for non-linear operators, deepinv.physics.LinearPhysics() for linear operators and deepinv.physics.DecomposablePhysics() for linear operators with a closed-form singular value decomposition. The only requirement is to define a deepinv.physics.Physics.A method that computes the forward operator.

See the example Creating a forward operator. for more details.

Tip

Defining a new linear operator requires the definition of deepinv.physics.LinearPhysics.A_adjoint, you can define the adjoint automatically using autograd with deepinv.physics.adjoint_function. Note however that coding a closed form adjoint is generally more efficient.

Tip

You can also inherit from mixin classes such as deepinv.physics.TimeMixin and deepinv.physics.MRIMixin to provide useful methods for your physics.