Why isint double hilber homogenous ?

[ReiNicolas]

I have been attempting to run some independent experiments and, in particular, to construct a density matrix using an ARNN. But apparently I can't do this because the doubled Hilbert space is not homogeneous, even though the original Hilbert space I am working with, a lattice spin, is.
Do somebody know why is that ?

[PhilipVinc]

DoubledHilbert is not a HomogeneousHilbert, because HomogeneousHilbert exposes the attribute ._local_states that DoubledHilbert does not.

I agree that conceptually if you build a DoubledHilbert out of a HomogeneousHilbert the doubled space should also be Homogeneous, but doing that is not entirely trivial to do in a clean way.

I suggest you just 'duplicate' the code of the ARNN and special case the case of DoubledHilbert in your code. It will work fine if you do.