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Support for complex tensors in LSMR #21

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tvercaut opened this issue Dec 5, 2022 · 0 comments
Open

Support for complex tensors in LSMR #21

tvercaut opened this issue Dec 5, 2022 · 0 comments

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@tvercaut
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tvercaut commented Dec 5, 2022

As illustrated in the scipy unit tests, the scipy implementation of LSMR supports complex matrices:
https://github.com/scipy/scipy/blob/main/scipy/sparse/linalg/_isolve/tests/test_lsmr.py

The version in pytorch-minimize currently does not as the real scalar numbers are created from the dtype of b rather than the equivalent real version.

A quick try to adapt it seems to work as shown here:
https://github.com/cai4cai/torchsparsegradutils/blob/main/torchsparsegradutils/utils/lsmr.py

It also passes the ported scipy unit tests:
https://github.com/cai4cai/torchsparsegradutils/blob/main/tests/test_lsmr.py

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