Qiskit / qiskit / 11633829245

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github

Committed by web-flow

Commit Message

Fix performance regression in looped `QuantumCircuit.assign_parameters` (#13337)

* Fix performance regression in looped `QuantumCircuit.assign_parameters`

When calling `assign_parameters` on a heavily parametric circuit with
the unusual access pattern of binding off a single parameter at a time,
Qiskit 1.2 had a severe performance regression compared to Qiskit 1.1
stemming from gh-12794.  The calls to `unsorted_parameters` on each
iteration were creating a new `set`, which could be huge if the number
of parameters in the circuit was large.  In Qiskit 1.1 and before, that
object was a direct view onto the underlying `ParameterTable` (assuming
the input circuit did not have a parametric global phase), so was free
to construct.

* Improve documentation

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20 existing lines in 3 files now uncovered.

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