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Change the default routing_method to sabre #12806

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merged 3 commits into from
Jul 29, 2024
Merged

Change the default routing_method to sabre #12806

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ce56f7e
change the default routing_method to sabre
1ucian0 Jul 23, 2024
ea89958
reno
1ucian0 Jul 23, 2024
b6c92f2
Update releasenotes/notes/sabre_level0-1524f01965257f3f.yaml
1ucian0 Jul 25, 2024
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2 changes: 1 addition & 1 deletion qiskit/transpiler/preset_passmanagers/level0.py
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Original file line number Diff line number Diff line change
Expand Up @@ -48,7 +48,7 @@ def level_0_pass_manager(pass_manager_config: PassManagerConfig) -> StagedPassMa
initial_layout = pass_manager_config.initial_layout
init_method = pass_manager_config.init_method or "default"
layout_method = pass_manager_config.layout_method or "default"
routing_method = pass_manager_config.routing_method or "stochastic"
routing_method = pass_manager_config.routing_method or "sabre"
translation_method = pass_manager_config.translation_method or "translator"
optimization_method = pass_manager_config.optimization_method or "default"
scheduling_method = pass_manager_config.scheduling_method or "default"
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13 changes: 13 additions & 0 deletions releasenotes/notes/sabre_level0-1524f01965257f3f.yaml
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@@ -0,0 +1,13 @@
---
upgrade_transpiler:
- |
The default routing pass used by optimization level 0 for :func:`.generate_preset_pass_manager`
and :func:`.transpile` has been changed from :class:`.StochasticSwap` to :class:`.SabreSwap`.
The :class:`.SabreSwap` pass performs exactly the same function but performs better in both
runtime and output quality (in number of swap gates and depth) compared to
:class:`.StochasticSwap`. For ``optimization_level=0`` this shouldn't matter because it's not
expected to run routing for the typical use case of level 0.

If you were relying on the previous default routing algorithm for any reason you can use the
``routing_method`` argument for :func:`.transpile` and :func:`.generate_preset_pass_manager`
to ``"stochastic"`` to use the :class:`.StochasticSwap` pass.
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