Fix deepcopy/pickle of DAGCircuit variable IO nodes
#14041
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We were accidentally using NodeType::VarIn when extracting DAGOutNode.
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kevinhartman
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Changelog: Bugfix
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ElePT
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Mar 18, 2025
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* Fix var DAGOutNode bug in DAGCircuit::pack_into. We were accidentally using NodeType::VarIn when extracting DAGOutNode. * Add release note since this is pre 2.0.0. (cherry picked from commit ddd0401) # Conflicts: # crates/circuit/src/dag_circuit.rs
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* Fix var DAGOutNode bug in DAGCircuit::pack_into. We were accidentally using NodeType::VarIn when extracting DAGOutNode. * Add release note since this is pre 2.0.0. (cherry picked from commit ddd0401) # Conflicts: # crates/circuit/src/dag_circuit.rs
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… (#14043) * Fix deepcopy/pickle of `DAGCircuit` variable IO nodes (#14041) * Fix var DAGOutNode bug in DAGCircuit::pack_into. We were accidentally using NodeType::VarIn when extracting DAGOutNode. * Add release note since this is pre 2.0.0. (cherry picked from commit ddd0401) # Conflicts: # crates/circuit/src/dag_circuit.rs * Fix conflict --------- Co-authored-by: Kevin Hartman <[email protected]> Co-authored-by: Elena Peña Tapia <[email protected]>
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… (#14044) * Fix deepcopy/pickle of `DAGCircuit` variable IO nodes (#14041) * Fix var DAGOutNode bug in DAGCircuit::pack_into. We were accidentally using NodeType::VarIn when extracting DAGOutNode. * Add release note since this is pre 2.0.0. (cherry picked from commit ddd0401) # Conflicts: # crates/circuit/src/dag_circuit.rs * Update dag_circuit.rs * Update crates/circuit/src/dag_circuit.rs --------- Co-authored-by: Kevin Hartman <[email protected]> Co-authored-by: Elena Peña Tapia <[email protected]>
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Summary
Fixes a typo we've had for a while in
DAGCircuit::pack_intothat would causeVaroutput nodes to become input nodes duringdeepcopyor pickling.Details and comments
The
DAGCircuit::pack_intomethod is only called with IO nodes from withinDAGCircuit::__setstate__, so this bug would only trigger for deep-copied or un-pickled DAGs with variables.