Online method throws error about moscot HOT 7 CLOSED

on hold.

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@michalk8 agreed to look into this a bit.

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The problem is here: https://github.com/theislab/moscot/blob/dev/moscot/_solver.py#L45
geom.cost_matrix is None when online=True. The Transport object than tries to access self.geometry.shape, which throws the above error. Not sure if not passing both cost/kernel is by design (or passing both and later ignoring kernel matrix), can't find any, except for coyping eps from another temp. geometry to the current one - can be useful and that's what I should've done in the above example. Imho, not really a bug, but a feature. Minimal reproducible example:

from ott.geometry.geometry import Geometry
Geometry().shape

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Ok, should we

• close this or
• open an issue in OTT?

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@MUCDK, can we move this issue to OTT and close it here?

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Or just close if it's no longer relevant please.

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I think we can close it for now, we could think about catching the error ourselves.

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