Avoid DivisionByZero error when TensorNetwork simplifies to a scalar #6586
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Problem: Python 3.12 requires quimb-1.8.0, but quimb-1.8.0 cannot evaluate path-info for TensorNetwork consisting of a scalar Tensor. Solution: Skip path-info evaluation for scalar TensorNetwork. Path-info is used for RAM estimation only which is not a problem for scalar TensorNetwork-s. This fixes unit test failure for cirq-core/cirq/contrib/quimb/grid_circuits_test.py::test_tensor_expectation_value Ref: jcmgray/quimb#231
| path_info = tn.contract(get='path-info') | ||
| ram_gb = path_info.largest_intermediate * 128 / 8 / 1024 / 1024 / 1024 | ||
| else: | ||
| ram_gb = 0 |
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should we raise an error or log a warning?
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I don't think it is needed. The error happens for a trivial TensorNetwork([Tensor()]) for which the memory requirements will be tiny.
The bug was BTW already fixed upstream, but I think we should still merge this so we support the current quimb-1.8.
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maybe add a TODO to remove this when we upgrade quimb ?
NoureldinYosri
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May 7, 2024
Codecov ReportAll modified and coverable lines are covered by tests ✅
Additional details and impacted files@@ Coverage Diff @@
## main #6586 +/- ##
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Coverage 97.79% 97.79%
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Files 1124 1124
Lines 95703 95705 +2
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+ Hits 93589 93595 +6
+ Misses 2114 2110 -4 ☔ View full report in Codecov by Sentry. |
jselig-rigetti
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May 28, 2024
…uantumlib#6586) Problem: Python 3.12 requires quimb-1.8.0, but quimb-1.8.0 cannot evaluate path-info for TensorNetwork consisting of a scalar Tensor. Solution: Skip path-info evaluation for scalar TensorNetwork. Path-info is used for RAM estimation only which is not a problem for scalar TensorNetwork-s. This fixes unit test failure for cirq-core/cirq/contrib/quimb/grid_circuits_test.py::test_tensor_expectation_value Ref: jcmgray/quimb#231
harry-phasecraft
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Oct 31, 2024
…uantumlib#6586) Problem: Python 3.12 requires quimb-1.8.0, but quimb-1.8.0 cannot evaluate path-info for TensorNetwork consisting of a scalar Tensor. Solution: Skip path-info evaluation for scalar TensorNetwork. Path-info is used for RAM estimation only which is not a problem for scalar TensorNetwork-s. This fixes unit test failure for cirq-core/cirq/contrib/quimb/grid_circuits_test.py::test_tensor_expectation_value Ref: jcmgray/quimb#231
pavoljuhas
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Jan 17, 2025
…rk simplifies to a scalar" The workaround is not needed after upstream fixes in quimb and our upgraded requirements for a later quimb version. This reverts commit bfba965.
BichengYing
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Jun 20, 2025
…uantumlib#6586) Problem: Python 3.12 requires quimb-1.8.0, but quimb-1.8.0 cannot evaluate path-info for TensorNetwork consisting of a scalar Tensor. Solution: Skip path-info evaluation for scalar TensorNetwork. Path-info is used for RAM estimation only which is not a problem for scalar TensorNetwork-s. This fixes unit test failure for cirq-core/cirq/contrib/quimb/grid_circuits_test.py::test_tensor_expectation_value Ref: jcmgray/quimb#231
BichengYing
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Jun 20, 2025
…rk simplifies to a scalar" (quantumlib#6958) The workaround is not needed after upstream fixes in quimb and our upgraded requirements for a later quimb version. This reverts commit bfba965.
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Problem: Python 3.12 requires quimb-1.8.0, but quimb-1.8.0 cannot
evaluate path-info for TensorNetwork consisting of a scalar Tensor.
Solution: Skip path-info evaluation for scalar TensorNetwork.
Path-info is used for RAM estimation only which is not a problem
for scalar TensorNetwork-s.
This fixes unit test failure for
cirq-core/cirq/contrib/quimb/grid_circuits_test.py::test_tensor_expectation_value
Ref: jcmgray/quimb#231