Can BlockDiagLinearOperator subsume BlockInterleavedLinearOperator?

[SebastianAment]

I noticed that the doc strings of BlockDiagLinearOperator and BlockInterleavedLinearOperator, as well as their implementations, are mostly identical (for the subset of methods implemented by the latter). Also, the only use of the interleaved operator that I found is here.

Is there a current or planned difference in functionality between the two, or could the interleaved operator be subsumed by the block diagonal one? If possible, this would reduce code complexity without compromising features, further benefitting test coverage and maintainability.

[Balandat]

Yeah good point. The name suggests that BlockInterleavedLinearOperator was introduced to deal with "interleaved' representations of multi-output MVNs, but at least a cursory pass through the code doesn't really reveal why we need this. At the very least it seems that one should be able to combine the two classes as you said.