Avoid module level sympy yet another time #5416
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Just as has been demonstrated many times in the past we should not be importing sympy at the module level. In Qiskit#5259 another import was added and was immediately flagged as an import speed regression [1]. Sympy is a very heavy dependency and is slow to import (and slow to run too). Adding a sympy import to the module level makes and is honestly a dependency we should be reluctant to add anywhere because it becomes the primary bottleneck whenever it is used. This commit removes the top level sympy import and moves to be a runtime import in the single method that uses sympy. Just as it was done in Qiskit#5149, Qiskit#4385, and Qiskit#3156 before. [1] https://qiskit.github.io/qiskit/#import.QiskitImport.time_qiskit_import?commits=b5d5a3bb
Cryoris
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Nov 20, 2020
mtreinish
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Jan 4, 2021
Just as has been demonstrated many times in the past we should not be importing sympy at the module level. In Qiskit#5358 another import was added and was immediately flagged as an import speed regression [1]. Sympy is a very heavy dependency and is slow to import (and slow to run too). Adding a sympy import to the module level makes and is honestly a dependency we should be reluctant to add anywhere because it becomes the primary bottleneck whenever it is used. This commit removes the top level sympy import and moves to be a runtime import in the single method that uses sympy. Just as it was done in Qiskit#5416, Qiskit#5149, Qiskit#4385, and Qiskit#3156 before. Fixes Qiskit#5575 [1] https://qiskit.github.io/qiskit/#import.QiskitImport.time_qiskit_import?commits=300e9507
kdk
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Just as has been demonstrated many times in the past we should not be importing sympy at the module level. In #5358 another import was added and was immediately flagged as an import speed regression [1]. Sympy is a very heavy dependency and is slow to import (and slow to run too). Adding a sympy import to the module level makes and is honestly a dependency we should be reluctant to add anywhere because it becomes the primary bottleneck whenever it is used. This commit removes the top level sympy import and moves to be a runtime import in the single method that uses sympy. Just as it was done in #5416, #5149, #4385, and #3156 before. Fixes #5575 [1] https://qiskit.github.io/qiskit/#import.QiskitImport.time_qiskit_import?commits=300e9507
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Summary
Just as has been demonstrated many times in the past we should not be
importing sympy at the module level. In #5259 another import was added
and was immediately flagged as an import speed regression [1]. Sympy is
a very heavy dependency and is slow to import (and slow to run too).
Adding a sympy import to the module level makes and is honestly a
dependency we should be reluctant to add anywhere because it becomes
the primary bottleneck whenever it is used. This commit removes the top
level sympy import and moves to be a runtime import in the single method
that uses sympy. Just as it was done in #5149, #4385, and #3156 before.
Details and comments
[1] https://qiskit.github.io/qiskit/#import.QiskitImport.time_qiskit_import?commits=b5d5a3bb