Add Migration Guide for `QuantumInstance` #9554

ElePT · 2023-02-08T15:30:07Z

Summary

Closes #9517.

Details and comments

Blocked by #9549

qiskit-bot · 2023-02-08T15:30:16Z

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coveralls · 2023-02-08T16:03:43Z

Pull Request Test Coverage Report for Build 4691111819

0 of 0 changed or added relevant lines in 0 files are covered.
478 unchanged lines in 40 files lost coverage.
Overall coverage increased (+0.3%) to 85.738%

Files with Coverage Reduction	New Missed Lines	%
qiskit/primitives/backend_sampler.py	1	98.81%
qiskit/synthesis/evolution/matrix_synthesis.py	1	93.75%
qiskit/transpiler/passes/layout/full_ancilla_allocation.py	1	97.73%
qiskit/transpiler/passes/optimization/template_matching/template_substitution.py	1	93.2%
qiskit/transpiler/passes/utils/check_map.py	1	97.83%
qiskit/algorithms/amplitude_estimators/estimation_problem.py	2	93.67%
qiskit/primitives/sampler.py	2	97.1%
qiskit/qasm/init.py	2	71.43%
qiskit/transpiler/passes/layout/csp_layout.py	2	96.67%
qiskit/transpiler/passes/layout/trivial_layout.py	2	91.3%

Totals
Change from base Build 4627350272:	0.3%
Covered Lines:	70162
Relevant Lines:	81833

💛 - Coveralls

docs/migration_guides/qi_migration.rst

…terra into qi-migration-guide

docs/migration_guides/qi_migration.rst

woodsp-ibm · 2023-03-23T19:01:31Z

docs/migration_guides/qi_migration.rst

+
+The functionality of :class:`~qiskit.utils.QuantumInstance.execute` has
+now been delegated to the different implementations of the :mod:`~qiskit.primitives` base classes,
+while the explicit transpilation has been left to the :mod:`~qiskit.transpiler` module (see table below).


This is more a comment, but since its talking about transpilation its done by default now by the primitives, so algorithms no longer need to manage that aspect along with binding parameters. Transpilation can be turned off - but since operator and circuit size need to match for Estimator, doing your own transpilation needs to meet that constraint - if say it adds swaps, which increase overall circuit width, then it will fail as there is no mechanism to say identify the active qubits it should consider.

I have added that algorithms no longer need to take care of transpilation, as it has been moved to the primitive level. I will see where I can mention the transpilation + Estimator challenges.

woodsp-ibm · 2023-03-23T19:06:35Z

docs/migration_guides/qi_migration.rst

+   * - QuantumInstance method
+     - Alternative
+   * - ``QuantumInstance.execute``
+     - ``Sampler.run`` or ``Estimator.run``


This might also be an alternative https://qiskit.org/documentation/apidoc/execute.html - though the QI one had the mitigation, job splitting/combining and reliability which you may now want/need to do yourself if using this.

We're probably going to deprecate execute, so that would not need to be listed as alternative 🙂 See also #7892

docs/migration_guides/qi_migration.rst

woodsp-ibm · 2023-03-23T21:45:41Z

docs/migration_guides/qi_migration.rst

+        circuit.x(1)
+        circuit.measure_all()
+
+        sampler = Sampler(run_options = {"method":"statevector", "shots":200})


Similar comment. I will note while this is ok for Sampler presently, as far as I am aware, the Aer Estimator will override any method you pass it as it sets it internally based on approximation and if noise model is used.

woodsp-ibm · 2023-03-23T21:47:01Z

docs/migration_guides/qi_migration.rst

+
+        estimator = Estimator(
+                   backend_options={
+                       "method": "density_matrix",


As mentioned above this will be overidden in any case - yes, you have what it chooses internally but there is no choice at this level.

docs/migration_guides/qi_migration.rst

woodsp-ibm · 2023-03-23T21:58:53Z

docs/migration_guides/qi_migration.rst

+    On the other hand, when using the primitives:
+
+    * You cannot explicitly access their transpilation routine.
+    * The mechanism to apply custom transpilation passes to the Aer, Runtime and Backend primitives is to pre-transpile


Care is needed here - as I mentioned in one of the earlier comments at the head of the file. In opflow the ansatz would always have the basis change and measurement gates added before transpilation so if the circuit ended up on more qubits it did not matter. Transpiling it first before giving it to the Estimator is a different flow.

added a warning

woodsp-ibm · 2023-03-23T22:03:47Z

docs/migration_guides/qi_migration.rst

+    Aer simulation following the statevector method. This would be the direct 1-1 replacement of the ``QuantumInstance``
+    example, as they are both accessing the same simulator. For this reason, the output metadata is
+    closer to the Quantum Instance's output. Please note that
+    the resulting quasi-probability distribution does not use bitstrings but **integers** to identify the states.


You could note the QuasiProb does have methods binary_probabilities and hex_probabilities if the integer keys are not to your liking.

Added note and example

Co-authored-by: Steve Wood <[email protected]>

declanmillar

LGTM! Again, just minor grammar tweaks.

docs/migration_guides/qi_migration.rst

Co-authored-by: Declan Millar <[email protected]>

Guillermo-Mijares-Vilarino

Hi Elena. The content looks great!

However I have some comments about the Sphinx links.

docs/migration_guides/qi_migration.rst

Guillermo-Mijares-Vilarino · 2023-04-05T11:13:06Z

docs/migration_guides/qi_migration.rst

+    The only alternative for local simulations using the quantum instance was using an Aer Simulator backend.
+    Please note that ``QuantumInstance.execute()`` returned the counts bitstrings in hexadecimal format.
+
+    .. testcode::


If you don't plan to run the tests (I see that you used the SKIP flag) you can use .. code-block:: python and .. code-block:: text for input and output respectively so you don't depend on the Sphinx doctest extension.

I didn't know about .. code-block:: text, thanks!

Co-authored-by: Guillermo-Mijares-Vilarino <[email protected]>

…terra into qi-migration-guide

Cryoris

Some minor points and one comment on the unbound PMs, otherwise LGTM 👍🏻

docs/migration_guides/qi_migration.rst

Cryoris · 2023-04-13T08:08:03Z

docs/migration_guides/qi_migration.rst

+        Quasi dists: [{2: 0.0008492371522941081, 3: 0.9968874384378738, 0: -0.0003921227905920063,
+		 1: 0.002655447200424097}]
+
+.. dropdown:: Example 4: Circuit Sampling with Custom Bound and Unbound Pass Managers


The power of unbound and bound pass managers in the quantum instance is actually coming from the combination with the CircuitSampler 🙂 If you have an unbound and bound pass manager (for example, the unbound pass manager does the routing and high level optimization and the bound does pulse optimization), then you could do

qi = QuantumInstance(pass_manager=unbound, bound_pass_manager=bound, ....) sampler = CircuitSampler(qi) circuits = .... # circuit with *free* parameters sampler.convert(circuits, param_values=....) # sampler will first do the unbound, then bind, then the bound for you

This workflow is (afaik) not possible anymore with the primitives. Should we update this example?

Co-authored-by: Julien Gacon <[email protected]>

docs/migration_guides/qi_migration.rst

Co-authored-by: Julien Gacon <[email protected]>

Cryoris

LGTM thanks for all the detailed work on the migration guides!

* Add draft * Remove qiskit * Add qi migration file * Add content * Finish content * Update provider syntax * Finish content * Apply auto-suggestions * Add doctests * Change to dropdowns * Add EM results * Apply suggestions from code review Co-authored-by: Steve Wood <[email protected]> * Apply review comments * Apply suggestions from Declan's code review Co-authored-by: Declan Millar <[email protected]> * Apply suggestions from Guillermo's code review Co-authored-by: Guillermo-Mijares-Vilarino <[email protected]> * Change from doctest to codeblocks * Review follow-up edits * Replace statevector with quantum info * Reorder index * Add assemble alternative * Apply suggestions from Julien's code review Co-authored-by: Julien Gacon <[email protected]> * Change transpilation example * Apply suggestions from Juliencode review Co-authored-by: Julien Gacon <[email protected]> --------- Co-authored-by: Steve Wood <[email protected]> Co-authored-by: Declan Millar <[email protected]> Co-authored-by: Guillermo-Mijares-Vilarino <[email protected]> Co-authored-by: Julien Gacon <[email protected]>

ElePT added 3 commits February 8, 2023 11:59

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Add migration guides from terra Qiskit/qiskit-metapackage#1664

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ElePT added 2 commits February 16, 2023 19:14

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ElePT marked this pull request as ready for review February 17, 2023 17:59

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ElePT added 2 commits February 20, 2023 17:30

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ElePT added this to the 0.24.0 milestone Feb 21, 2023

ElePT added documentation Something is not clear or an error documentation mod: opflow Related to the Opflow module labels Feb 21, 2023

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Add Migration Guide for Opflow #9549

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Add Migration Guide for `QuantumInstance` #9554

Add Migration Guide for `QuantumInstance` #9554

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Add Migration Guide for QuantumInstance #9554

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Add Migration Guide for `QuantumInstance` #9554

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