Subspace expansion #160
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added 20 commits
April 1, 2024 16:47
…ommented out full expansion.
b-kloss
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Apr 22, 2024
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mtfishman
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Apr 26, 2024
src/ITensorNetworks.jl
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| #include("solvers/subspace_expansions/linalg/rsvd_aux.jl") | ||
| #include("solvers/subspace_expansions/linalg/rsvd_linalg.jl") |
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To be deleted, as discussed in #137.
mtfishman
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Apr 26, 2024
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To be deleted, as discussed in #137.
mtfishman
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There was a problem hiding this comment.
To be deleted, as discussed in #137.
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This PR introduces a general and flexible subspace expansion interface.
This allows users to perform a 2-site expansion alongside other (typically 1-site) routines, which has better scaling both in the bond dimension and the local Hilbertspace dimension than their 2-site analogs.
The expansion works on general tree structures and can be seamlessly incorporated into existing algorithms by composing and chaining different local updaters via the
compose_updatersfunction.Keyword arguments like
maxdimandcutoffinside ofexpander_kwargscan be used to modify parameters specific to the expansion. Furthermore, a general, randomized svd-routine has been implemented, which can be used for the expansion and allows for the favorable, aforementioned scaling.An example script can be found in the test folder.