Conversion as LinearOperator from scipy

[paquiteau]

The LinearOperator interface ¹ is proposed by Scipy for describing linearOperator which are too big to be represented as matrices. MRI-NUFFT Operators are linear operators, so we could support quite easily.
LinearOperator are also used in PyLops ² (and PyProximal ³).

In term of implementation I think a wrapper class, and a custom method (FourierBaseOperator.make_linear_operator) should do the trick.

Footnotes

1. https://docs.scipy.org/doc/scipy/reference/generated/scipy.sparse.linalg.LinearOperator.html ↩

2. https://pylops.readthedocs.io/en/latest/# ↩

3. https://pyproximal.readthedocs.io/en/stable/index.html ↩

[alguiguilo098]

hi @paquiteau, what up ?
i want try finish this issue, ok ?

[paquiteau]

Hello, feel free to make a pull request.

You can check the CONTRIBUTING.md for guidance if needed