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Allow Python to construct a populated SampleResult from global counts - #5023

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Allow Python to construct a populated SampleResult from global counts#5023
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anpaz:sample-results

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@anpaz anpaz commented Jul 29, 2026

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Closes: #5011

Summary

Adds Python-side constructors and properties so that cudaq.SampleResult can be created directly from a counts dictionary without running a kernel or hand-building the serialization format. This unblocks Python-implemented backends and integrations that produce measurement counts but had no way to wrap them in a SampleResult.

Changes

New constructor – accepts a dict[str, int] of bitstring counts and an optional annotations dict:

result = cudaq.SampleResult({"00": 512, "11": 488})
result = cudaq.SampleResult({"00": 480, "11": 470}, annotations={"shots": 1000})

New properties:

  • result.counts – returns the global counts as a dict[str, int] (snapshot; mutations don't affect the result).
  • result.annotations – read-only metadata dict that backends can use to attach extra information (e.g. authoritative shot count, job IDs, timing).

C++ support:

  • Added sample_result(CountsDictionary, cudaq_json) constructor that populates the global register and computes totalShots.
  • Introduced cudaq_json – a pimpl wrapper around nlohmann::json that keeps the heavy header out of SampleResult.h.
  • Moved get_total_shots() out-of-line for consistency.

Bindings infrastructure:

  • Added a nanobind type_caster<nlohmann::json> in NanobindAdaptors.h for bidirectional Python↔JSON conversion (dict, list, str, int, float, bool, None).

Tests:

  • New test_sample_result.py covering construction, counts property, annotations, and the full Mapping protocol (__contains__, __iter__, __len__, __getitem__, items, values).

Usage

import cudaq

result = cudaq.SampleResult({"00": 512, "11": 488})
result["00"]              # 512
result.get_total_shots()  # 1000
result.counts             # {'00': 512, '11': 488}
result.annotations        # {}

# With annotations (e.g. when shots were filtered):
result = cudaq.SampleResult({"00": 480, "11": 470}, annotations={"shots": 1000})
result.get_total_shots()  # 950 (always sum of counts)
result.annotations["shots"]  # 1000 (authoritative value from backend)

@github-actions github-actions Bot added runtime CUDA quantum runtime python-lang Anything related to the Python CUDA Quantum language implementation labels Jul 29, 2026
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@anpaz
SampleResults w/annotations
890cfb6 
Signed-off-by: Andres Paz <andresp@nvidia.com>
@anpaz
spellchecking nanobind
8447f89 
Signed-off-by: Andres Paz <andresp@nvidia.com>
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Overall looks like going in the right direction. Thanks @anpaz. Left a few comments.

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Comment thread python/runtime/common/py_SampleResult.cpp
Comment thread python/runtime/common/py_SampleResult.cpp
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@lmondada lmondada mentioned this pull request Jul 31, 2026
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anpaz added 4 commits August 3, 2026 16:46
@anpaz
incorporate pr feedback
5ef4cd0 
Signed-off-by: Andres Paz <andresp@nvidia.com>
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incorporate pr feedback
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Fix binding comment
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Merge branch 'main' into sample-results
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Thanks a lot!!

lmondada added a commit to lmondada/cuda-quantum that referenced this pull request Aug 4, 2026
@lmondada
Squashed PR NVIDIA#5023: Allow Python to construct a populated Sample…
7e7f965 
…Result

Cherry-picked and squashed from NVIDIA#5023
(commits 890cfb6, 8447f89) so that cudaq._experimental runtime endpoints
can return real measurement counts from Python.

Drop this commit when rebasing onto a base that already contains PR NVIDIA#5023.

Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>

Signed-off-by: Luca Mondada <luca@mondada.net>
lmondada pushed a commit to lmondada/cuda-quantum that referenced this pull request Aug 4, 2026
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Squashed PR NVIDIA#5023: Allow Python to construct a populated Sample…
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LGTM. Thanks @anpaz.

anpaz added 2 commits August 4, 2026 13:59
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Merge branch 'main' into sample-results
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Undo totalShots
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Signed-off-by: Andres Paz <andresp@nvidia.com>
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anpaz enabled auto-merge August 4, 2026 21:36
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Load wheel dependencies (arm64, 13.0) / Metadata ✅ success view
Prepare cache clean-up ❔ queued view
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⚠️ Required checks (12/41) — 29 missing — declared in .github/required-checks.yml for merge_group
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Build and test (amd64, llvm, openmpi) / Dev environment (Debug) ✅ success view
Build and test (amd64, llvm, openmpi) / Dev environment (Python) ✅ success view
Build and test (arm64, llvm, openmpi) / Dev environment (Debug) ✅ success view
Build and test (arm64, llvm, openmpi) / Dev environment (Python) ✅ success view
Build and test (amd64, gcc12, openmpi) / Dev environment (Debug) ✅ success view
Build and test (amd64, gcc12, openmpi) / Dev environment (Python) ✅ success view
Build and test (arm64, gcc12, openmpi) / Dev environment (Debug) ✅ success view
Build and test (arm64, gcc12, openmpi) / Dev environment (Python) ✅ success view
Create CUDA Quantum installer (amd64, 12.6) / Build CUDA Quantum assets ❔ missing
Create CUDA Quantum installer (amd64, 12.6) / Minimal OpenMPI installation ❔ missing
Create CUDA Quantum installer (amd64, 12.6) / Validate installer (debian:12) ❔ missing
Create CUDA Quantum installer (amd64, 12.6) / Validate installer (fedora:42) ❔ missing
Create CUDA Quantum installer (amd64, 12.6) / Validate installer (opensuse/leap:15.5) ❔ missing
Create CUDA Quantum installer (amd64, 12.6) / Validate installer (redhat/ubi9:9.6) ❔ missing
Create CUDA Quantum installer (amd64, 12.6) / Validate installer (ubuntu:22.04) ❔ missing
Create CUDA Quantum installer (arm64, 12.6) / Build CUDA Quantum assets ❔ missing
Create CUDA Quantum installer (arm64, 12.6) / Minimal OpenMPI installation ❔ missing
Create CUDA Quantum installer (arm64, 12.6) / Validate installer (redhat/ubi9:9.6) ❔ missing
Create CUDA Quantum installer (arm64, 12.6) / Validate installer (ubuntu:22.04) ❔ missing
Create Docker images (amd64) / Documentation ✅ success view
Create Docker images (amd64) / Validation ✅ success view
Create Docker images (arm64) / Validation ✅ success view
Create Python metapackages / Build Python metapackages ❔ missing
Create Python metapackages / Test Python metapackages (3.11) ❔ missing
Create Python metapackages / Test Python metapackages (3.13) ❔ missing
Create Python metapackages / Test Python metapackages (3.14) ❔ missing
Create Python metapackages / Test Python metapackages (12.6, 3.11) ❔ missing
Create Python metapackages / Test Python metapackages (12.6, 3.13) ❔ missing
Create Python metapackages / Test Python metapackages (12.6, 3.14) ❔ missing
Create Python wheels (amd64, 3.11, 12.6) / Validate wheel (debian:12, --user) ⛔ cancelled view
Create Python wheels (amd64, 3.11, 12.6) / Validate wheel (debian:12) ⛔ cancelled view
Create Python wheels (amd64, 3.11, 12.6) / Validate wheel (fedora:42, --user) ⛔ cancelled view
Create Python wheels (amd64, 3.11, 12.6) / Validate wheel (fedora:42) ⛔ cancelled view
Create Python wheels (amd64, 3.11, 12.6) / Validate wheel (redhat/ubi8:8.10, --user) ⛔ cancelled view
Create Python wheels (amd64, 3.11, 12.6) / Validate wheel (redhat/ubi8:8.10) ⛔ cancelled view
Create Python wheels (arm64, 3.11, 12.6) / Validate wheel (debian:12, --user) ⛔ cancelled view
Create Python wheels (arm64, 3.11, 12.6) / Validate wheel (debian:12) ⛔ cancelled view
Create Python wheels (arm64, 3.11, 12.6) / Validate wheel (fedora:42, --user) ⛔ cancelled view
Create Python wheels (arm64, 3.11, 12.6) / Validate wheel (fedora:42) ⛔ cancelled view
Create Python wheels (arm64, 3.11, 12.6) / Validate wheel (redhat/ubi8:8.10, --user) ✅ success view
Create Python wheels (arm64, 3.11, 12.6) / Validate wheel (redhat/ubi8:8.10) ⛔ cancelled view

@github-merge-queue
github-merge-queue Bot removed this pull request from the merge queue due to failed status checks Aug 5, 2026
@anpaz
anpaz added this pull request to the merge queue Aug 5, 2026
@anpaz
anpaz removed this pull request from the merge queue due to a manual request Aug 5, 2026
@anpaz
add cudaq_json to docs
a26afb5 
Signed-off-by: Andres Paz <andresp@nvidia.com>
@github-actions github-actions Bot added the documentation Improvements or additions to documentation label Aug 5, 2026
@anpaz
Spellcheck
eefe5fa 
Signed-off-by: Andres Paz <andresp@nvidia.com>
@anpaz
anpaz enabled auto-merge August 5, 2026 20:30
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anpaz added this pull request to the merge queue Aug 5, 2026
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@anpaz
Spelling 2
c438fe0 
Signed-off-by: Andres Paz <andresp@nvidia.com>
@anpaz
anpaz enabled auto-merge August 6, 2026 01:43
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anpaz added this pull request to the merge queue Aug 6, 2026
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@lmondada
lmondada added this pull request to the merge queue Aug 6, 2026
@github-merge-queue
github-merge-queue Bot removed this pull request from the merge queue due to failed status checks Aug 6, 2026
@anpaz
anpaz added this pull request to the merge queue Aug 6, 2026
@github-merge-queue
github-merge-queue Bot removed this pull request from the merge queue due to failed status checks Aug 7, 2026
@anpaz
anpaz added this pull request to the merge queue Aug 7, 2026
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@sacpis sacpis sacpis approved these changes
@lmondada lmondada lmondada approved these changes
@bettinaheim bettinaheim Awaiting requested review from bettinaheim
@1tnguyen 1tnguyen Awaiting requested review from 1tnguyen
@bmhowe23 bmhowe23 Awaiting requested review from bmhowe23
@mitchdz mitchdz Awaiting requested review from mitchdz

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documentation Improvements or additions to documentation python-lang Anything related to the Python CUDA Quantum language implementation runtime CUDA quantum runtime

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@anpaz @sacpis @lmondada