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Avoid deepcopy in sabre_swap #5316

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Merged
mergify merged 2 commits into from
Nov 2, 2020
Merged

Avoid deepcopy in sabre_swap #5316

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bfef5b4
Avoid deepcopy in sabre_swap
mtreinish Oct 29, 2020
820cc8d
Merge branch 'master' into fix-copy-sabre
mergify[bot] Nov 2, 2020
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4 changes: 2 additions & 2 deletions qiskit/transpiler/passes/routing/sabre_swap.py
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Original file line number Diff line number Diff line change
Expand Up @@ -13,7 +13,7 @@
"""Routing via SWAP insertion using the SABRE method from Li et al."""

import logging
from copy import deepcopy
from copy import copy
from itertools import cycle
import numpy as np

Expand Down Expand Up @@ -336,7 +336,7 @@ def _score_heuristic(self, heuristic, front_layer, extended_set, layout, swap_qu

def _transform_gate_for_layout(op_node, layout):
"""Return node implementing a virtual op on given layout."""
mapped_op_node = deepcopy(op_node)
mapped_op_node = copy(op_node)

device_qreg = op_node.qargs[0].register
premap_qargs = op_node.qargs
Expand Down