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Added an 'identity' tensor splitting option #241

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Added an 'identity' tensor splitting option #241

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2b4efd7
Added an 'identity' tensor splitting option
rballester Jun 26, 2024
ad30164
PR update
rballester Sep 11, 2024
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12 changes: 12 additions & 0 deletions quimb/tensor/decomp.py
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Original file line number Diff line number Diff line change
Expand Up @@ -185,6 +185,18 @@ def _trim_and_renorm_svd_result(
return U, None, VH


@compose
def identity(x, **kwargs):
"""
No-op "decomposition" that leaves the input unchanged. Can be useful to quickly build a tensor network representing a given tensor "as is".
"""

if x.shape[0] < x.shape[1]:
return do("eye", x.shape[0], like=x), None, x
else:
return x, None, do("eye", x.shape[1], like=x)


@compose
def svd_truncated(
x,
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1 change: 1 addition & 0 deletions quimb/tensor/tensor_core.py
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Expand Up @@ -325,6 +325,7 @@ def rand_uuid(base=""):

_VALID_SPLIT_GET = {None, "arrays", "tensors", "values"}
_SPLIT_FNS = {
"identity": decomp.identity,
"svd": decomp.svd_truncated,
"eig": decomp.svd_via_eig_truncated,
"lu": decomp.lu_truncated,
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