Qiskit / qiskit-ibm-runtime / 7729012573
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Set use_symengine on qpy generation if symengine is installed (#1355)

This commit sets the use_symengine flag during qpy export used during
job payload generation if symengine is installed. For qiskit <1.0
symengine is a hard dependency on platforms that have support for it
(x86_64, aarch64, and ppc64le linux and macOS) and an optional
requirement on other qiskit supported platforms, and when available it
greatly improves the runtime performance of symbolic expressions in
Qiskit. By default QPY opts for the more compatible sympy representation
of an unbound ParameterExpression as it's maximally compatible, and
means that no matter the environment the payload will be loaded from it
will be able to parse the payload. In QPY version 10 a new flag was
added to the payload definition that enables users to use a native
binary symengine representation of a symbolic expression that is
significantly faster to generate and parse, but it still defaults to
sympy as using this flag limits the compatibility of the payload.
However, for runtime job submission we know that the service always has
symengine available so we should be using this flag for job submission
if the local environment has symengine installed as it will greatly
speed up the serialization of unbound ParameterExpression objects.

In Qiskit 1.0, symengine is promoted to a hard requriment for all
environments and use_symengine=True is the default in Qiskit's qpy
module. But, setting it like this is still a good idea as it will always
be safe to do this, it's just in qiskit 1.0 symengine will always be
installed.

3197 of 5394 relevant lines covered (59.27%)

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Jobs
ID Job ID Ran Files Coverage
1 unit-tests_python3.8-ubuntu-latest - 7729012573.1 169
59.19
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2 unit-tests_python3.10-ubuntu-latest - 7729012573.2 169
59.25
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3 unit-tests_python3.10-windows-latest - 7729012573.3 169
56.6
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4 unit-tests_python3.9-ubuntu-latest - 7729012573.4 169
59.21
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5 unit-tests_python3.11-ubuntu-latest - 7729012573.5 169
59.25
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6 unit-tests_python3.9-macOS-latest - 7729012573.6 169
59.21
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7 unit-tests_python3.10-macOS-latest - 7729012573.7 169
59.25
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8 unit-tests_python3.11-macOS-latest - 7729012573.8 169
59.25
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9 unit-tests_python3.8-macOS-latest - 7729012573.9 169
59.19
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10 unit-tests_python3.9-windows-latest - 7729012573.10 169
56.55
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11 unit-tests_python3.11-windows-latest - 7729012573.11 169
56.6
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12 unit-tests_python3.8-windows-latest - 7729012573.12 169
56.54
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Source Files on build 7729012573