fix: reconcile posterior device after mapped load - #1972
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📝 WalkthroughWalkthroughThe changes add recursive device inference and reconcile ChangesDevice reconciliation on posterior load
Estimated code review effort: 3 (Moderate) | ~20 minutes Merge Risk: 🔵 Low · up to The PR fixes stale device state after mapped posterior loads and adds coverage, but two round-trip tests still use a platform-dependent temporary-file pattern that may affect test execution on some platforms. The change is mergeable with explicit owner follow-up on test portability. Sequence Diagram(s)sequenceDiagram
participant torch.load
participant NeuralPosterior
participant infer_tensor_device
participant PosteriorComponents
torch.load->>NeuralPosterior: restore serialized state
NeuralPosterior->>infer_tensor_device: inspect restored tensors
infer_tensor_device-->>NeuralPosterior: return detected device
NeuralPosterior->>PosteriorComponents: move posterior components to detected device
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Codecov Report❌ Patch coverage is
Additional details and impacted files@@ Coverage Diff @@
## main #1972 +/- ##
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+ Coverage 88.18% 89.39% +1.20%
==========================================
Files 140 140
Lines 14110 14248 +138
==========================================
+ Hits 12443 12737 +294
+ Misses 1667 1511 -156
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@coderabbitai is it covering all the issue and jan review in #1959 |
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echo '=== PR `#1959` review comments and conversation ==='
gh api --paginate repos/sbi-dev/sbi/pulls/1959/comments \
--jq '.[] | {user: .user.login, path, line, original_line, body, html_url}'
gh api --paginate repos/sbi-dev/sbi/issues/1959/comments \
--jq '.[] | {user: .user.login, body, html_url}'
echo '=== Current PR changed files ==='
gh pr view 1972 --repo sbi-dev/sbi --json files --jq '.files[] | "\(.path) (+\(.additions)/-\(.deletions))"'
echo '=== Source maps ==='
ast-grep outline sbi/inference/posteriors/base_posterior.py --items all --match '__setstate__|to|NeuralPosterior'
ast-grep outline sbi/inference/posteriors/vi_posterior.py --items all --match '__setstate__|to|VIPosterior'
ast-grep outline sbi/utils/torchutils.py --items all --match 'infer_tensor_device'
echo '=== Relevant implementations ==='
rg -n -A75 -B12 'def __setstate__|def infer_tensor_device' \
sbi/inference/posteriors/base_posterior.py \
sbi/inference/posteriors/vi_posterior.py \
sbi/utils/torchutils.py
echo '=== New mapped-load tests ==='
rg -n -A55 -B8 'map_location|infer_tensor_device|reconcile|loaded.*device' \
tests/inference_on_device_test.pyLength of output: 59358
Covered items:
One validation limit remains: I can verify the implementation and test coverage from the PR, but I cannot independently confirm local GPU-marked test execution, full You are interacting with an AI system. |
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@janfb may I know how you would prefer for easy testing my local venv taking more time your suggestion will be helpful thanks! |
you need to test locally only the specific GPU tests that are affected by your changes, not the entire test suite. I hope this helps. |
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@coderabbitai review and Provide the total pull request stage and check if the issue requirements are met and check is it matching canonical_device() from sbi/utils/torchutils.py #1958 |
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echo '=== Current PR metadata, reviews, and checks ==='
gh pr view 1972 --repo sbi-dev/sbi \
--json state,isDraft,mergeStateStatus,reviewDecision,statusCheckRollup,reviews,comments \
--jq '{state,isDraft,mergeStateStatus,reviewDecision,statusCheckRollup,reviews,comments}'
echo '=== Issue `#1954` ==='
gh issue view 1954 --repo sbi-dev/sbi --json state,title,body,comments \
--jq '{state,title,body,comments}'
echo '=== PR `#1958` summary and changed files ==='
gh pr view 1958 --repo sbi-dev/sbi --json state,title,body,files,commits \
--jq '{state,title,body,files:[.files[]|{path,additions,deletions}],commits:[.commits[]|{oid,messageHeadline}]}'
echo '=== Current PR diff for device reconciliation files ==='
git diff --unified=80 origin/main...HEAD -- \
sbi/inference/posteriors/base_posterior.py \
sbi/inference/posteriors/vi_posterior.py \
sbi/utils/torchutils.py \
tests/inference_on_device_test.py
echo '=== AST outlines ==='
ast-grep outline sbi/utils/torchutils.py --items all --match 'canonical_device|infer_tensor_device'
ast-grep outline sbi/inference/posteriors/base_posterior.py --items all --match 'NeuralPosterior|__setstate__|to'
ast-grep outline sbi/inference/posteriors/vi_posterior.py --items all --match 'VIPosterior|__setstate__|to'
ast-grep outline tests/inference_on_device_test.py --items all --match 'pickle_map_location'
echo '=== Definitions and mapped-load tests ==='
rg -n -A100 -B15 \
'def canonical_device|def infer_tensor_device|def __setstate__|def test_pickle_map_location' \
sbi/utils/torchutils.py \
sbi/inference/posteriors/base_posterior.py \
sbi/inference/posteriors/vi_posterior.py \
tests/inference_on_device_test.pyLength of output: 110269
Pull request stage
The PR is technically validated by CI. The PR cannot merge until a required maintainer review is submitted. Issue
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@coderabbitai review and any blocking issues |
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repo="sbi-dev/sbi"
pr="1972"
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gh pr view "$pr" --repo "$repo" \
--json state,isDraft,mergeStateStatus,reviewDecision,statusCheckRollup,headRefOid \
--jq '{state,isDraft,mergeStateStatus,reviewDecision,headRefOid,statusCheckRollup}'
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--jq '.files[] | "\(.path) (+\(.additions)/-\(.deletions))"'
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gh api --paginate "repos/$repo/issues/$pr/comments" \
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echo '=== Diff ==='
git diff --unified=50 origin/main...HEAD -- \
sbi/inference/posteriors/base_posterior.py \
sbi/inference/posteriors/vi_posterior.py \
sbi/utils/torchutils.py \
tests/inference_on_device_test.py
echo '=== Source outlines ==='
ast-grep outline sbi/inference/posteriors/base_posterior.py --items all --match 'NeuralPosterior|__setstate__|to'
ast-grep outline sbi/inference/posteriors/vi_posterior.py --items all --match 'VIPosterior|__setstate__|to'
ast-grep outline sbi/utils/torchutils.py --items all --match 'canonical_device|infer_tensor_device'
ast-grep outline tests/inference_on_device_test.py --items all --match 'pickle_map_location'Length of output: 56504 🏁 Script executed: #!/bin/bash
set -euo pipefail
echo '=== Device migration contracts ==='
ast-grep outline sbi/inference/potentials --items all --match 'BasePotential|to'
ast-grep outline sbi/inference/posteriors --items all --match 'DirectPosterior|MCMCPosterior|ImportanceSamplingPosterior|RejectionPosterior|VectorFieldPosterior|to'
ast-grep outline sbi/utils/user_input_checks_utils.py --items all --match 'move_distribution_to_device'
echo '=== Relevant implementations ==='
rg -n -A120 -B12 \
'class BasePotential|def to\(|def move_distribution_to_device|class VectorFieldPosterior|class VIPosterior' \
sbi/inference/potentials \
sbi/inference/posteriors \
sbi/utils/user_input_checks_utils.py
echo '=== NeuralPosterior state fields and subclasses ==='
rg -n -A35 -B10 \
'self\.(potential_fn|theta_transform|default_x|_x|prior|proposal|posterior_estimator|vector_field_estimator|_q|_amortized_q|device|_device)\s*=|def __setstate__' \
sbi/inference/posteriors/base_posterior.py \
sbi/inference/posteriors/vi_posterior.py \
sbi/inference/posteriors/direct_posterior.py \
sbi/inference/posteriors/mcmc_posterior.py \
sbi/inference/posteriors/importance_posterior.py \
sbi/inference/posteriors/rejection_posterior.py \
sbi/inference/posteriors/vector_field_posterior.pyLength of output: 201808
The implementation meets the core requirement in
All required checks currently pass. The pull request is blocked only because GitHub requires a maintainer review. The missing update to
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@janfb — I also ran the full GPU suite locally on MPS, as you did, to cover the other posteriors too. |
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@janfb @BHARATH0153 hi my name is sai overall looks great and here are some points What it doesFixes The core mechanismactual_device = infer_tensor_device(self)
if actual_device is None or canonical_device(actual_device) == canonical_device(self._device):
return
self._device = actual_device
...
1. "First tensor found" is a heuristic, not a guarantee of consistency. 2. if hasattr(self, "potential_fn"):
self.potential_fn.to(actual_device) # type: ignore[union-attr]This assumes any 3. **4. The reconciliation logic and
That would get this logic under real CI coverage instead of relying entirely on manual GPU runs before every future refactor. 5. Non-blocking, already flagged by CodeRabbit: issue #1954 also asked for at lastThe logic itself looks correct for the mainline case (uniform |
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@saithaandra-glitch thanks for the review I will address them and please check #1959 this closed one check this once and I think you are new to sbi-dev welcome thanks! |
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@janfb @BHARATH0153 #1972 (comment) was my review is on point |
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@saithaandra-glitch please don't ping Jan every time he is really busy in gsoc and some other work if you want to know anything about the pr feel free to ping anytime and yes your review is really helpful thanks! |
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@BHARATH0153 sorry for the ping |
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Thanks both for the activity! @saithaandra-glitch, thanks for helping out with the review here! But please do not post reviews on pull requests unless the author or a maintainer asks for one, and please do not post reviews that an AI assistant wrote. I cannot confirm whether the points are correct. That check costs more time than the review saves, and it is why we keep reviewing with the maintainers. We recently started running CodeRabbit on every pull request for the automated part. We will updated this in our contributing guide soon to make it clearer. @BHARATH0153, thanks commenting and explaining here! I will get to the review of this PR myself soon. |
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Inline comments:
In `@tests/save_and_load_test.py`:
- Around line 191-193: Update both NamedTemporaryFile blocks to pass the open
handle f directly to torch.save, then flush and rewind f before passing it to
torch.load, avoiding reopening the temporary path while preserving CPU loading
and existing serialization behavior.
🪄 Autofix
Fix all unresolved CodeRabbit comments on this PR:
- Push a commit to this branch (recommended)
- Create a new PR with the fixes
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tests/save_and_load_test.py
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added two CPU tests in save_and_load_test.py to get codecov/patch green, since the inference_on_device tests are skipped in CI." |
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@coderabbitai I added two CPU tests in save_and_load_test.py to get codecov/patch green, since the inference_on_device tests are skipped in CI." review and approve |
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repo="sbi-dev/sbi"
pr="1972"
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gh pr view "$pr" --repo "$repo" \
--json headRefOid,mergeStateStatus,reviewDecision,statusCheckRollup,files \
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echo '=== Focused current diff ==='
git diff --unified=70 origin/main...HEAD -- \
tests/save_and_load_test.py \
sbi/inference/posteriors/base_posterior.py \
sbi/inference/posteriors/vi_posterior.py \
sbi/utils/torchutils.py
echo '=== Source maps ==='
ast-grep outline tests/save_and_load_test.py --items all --match 'map_location|device|load'
ast-grep outline sbi/inference/posteriors/base_posterior.py --items all --match 'NeuralPosterior|__setstate__'
ast-grep outline sbi/inference/posteriors/vi_posterior.py --items all --match 'VIPosterior|__setstate__'
ast-grep outline sbi/utils/torchutils.py --items all --match 'canonical_device|infer_tensor_device'
echo '=== CPU mapped-load tests and exercised code ==='
rg -n -A100 -B15 \
'map_location|def __setstate__|def infer_tensor_device|def canonical_device' \
tests/save_and_load_test.py \
sbi/inference/posteriors/base_posterior.py \
sbi/inference/posteriors/vi_posterior.py \
sbi/utils/torchutils.pyLength of output: 54259
The new tests add useful CI coverage:
The CPU tests correctly test the branch logic without GPU hardware. The GPU-marked tests remain necessary to verify real cross-device storage remapping. CI, type checking, linting, and ✅ Action performedReview finished.
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git diff --unified=60 origin/main...HEAD -- \
tests/save_and_load_test.py \
sbi/inference/posteriors/base_posterior.py \
sbi/inference/posteriors/vi_posterior.py \
sbi/utils/torchutils.py
echo '=== Relevant source outline ==='
ast-grep outline tests/save_and_load_test.py --items all --match 'torch_load|map_location|device|load'
ast-grep outline sbi/inference/posteriors/base_posterior.py --items all --match 'NeuralPosterior|__setstate__'
ast-grep outline sbi/inference/posteriors/vi_posterior.py --items all --match 'VIPosterior|__setstate__'
ast-grep outline sbi/utils/torchutils.py --items all --match 'canonical_device|infer_tensor_device'
echo '=== Relevant test and implementation contexts ==='
rg -n -A100 -B12 \
'def test_.*map_location|def __setstate__|def infer_tensor_device|def canonical_device' \
tests/save_and_load_test.py \
sbi/inference/posteriors/base_posterior.py \
sbi/inference/posteriors/vi_posterior.py \
sbi/utils/torchutils.py
echo '=== Unresolved review comments ==='
gh api --paginate "repos/$repo/pulls/$pr/comments" \
--jq '.[] | select(.position != null) | {user:.user.login,path,line,body,html_url}'Length of output: 60215
All current CI, linting, type checking, license, and Codecov checks pass. The two CPU tests provide useful coverage for both the reconciliation branch and the same-device branch. One valid issue remains in
Use the open file handle for both operations. Flush and rewind it before with tempfile.NamedTemporaryFile(suffix=".pt") as f:
torch.save(posterior, f)
f.flush()
f.seek(0)
loaded = torch.load(f, weights_only=False, map_location="cpu")Apply this change to both new tests. After that change, request another review. You are interacting with an AI system. |
✅ Action performedReview finished.
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git diff --unified=70 origin/main...HEAD -- \
tests/save_and_load_test.py \
sbi/inference/posteriors/base_posterior.py \
sbi/inference/posteriors/vi_posterior.py \
sbi/utils/torchutils.py
echo '=== Test and restoration source maps ==='
ast-grep outline tests/save_and_load_test.py --items all --match 'map_location|load|NamedTemporaryFile'
ast-grep outline sbi/inference/posteriors/base_posterior.py --items all --match 'NeuralPosterior|__setstate__'
ast-grep outline sbi/inference/posteriors/vi_posterior.py --items all --match 'VIPosterior|__setstate__'
ast-grep outline sbi/utils/torchutils.py --items all --match 'canonical_device|infer_tensor_device'
echo '=== Relevant implementations ==='
rg -n -A110 -B15 \
'NamedTemporaryFile|def test_.*map_location|def __setstate__|def infer_tensor_device' \
tests/save_and_load_test.py \
sbi/inference/posteriors/base_posterior.py \
sbi/inference/posteriors/vi_posterior.py \
sbi/utils/torchutils.py
echo '=== Active review comments ==='
gh api --paginate "repos/$repo/pulls/$pr/comments" \
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Both CPU tests now use the open I found no blocking code issue in the current diff. I cannot approve yet. The CI matrix and the CodeRabbit check are still in progress. GitHub also reports You are interacting with an AI system. |
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set -euo pipefail
echo '=== Current mapped-load test structure ==='
ast-grep outline tests/save_and_load_test.py --items all --match 'map_location|NamedTemporaryFile'
echo '=== Current mapped-load test code ==='
sed -n '175,230p' tests/save_and_load_test.py
echo '=== PR diff for mapped-load tests ==='
git diff --unified=25 origin/main...HEAD -- tests/save_and_load_test.pyLength of output: 7250
The current code fixes the Windows temporary-file issue. All reported checks passed. I found no blocking issue. [approve] You are interacting with an AI system. |
3 participants
description
Fix stale posterior device state after loading with
torch.load(..., map_location=...).Changes
VIPosteriorrestoration through the base reconciliation and its ownto()method.Closes #1954 Supersedes #1959
How I tested
with the suggestion of @janfb
CI doesn't run
gpu-marked tests, so I ran the new tests locally on my Mac (MPS backend, Python 3.12, torch 2.13)pytest tests/inference_on_device_test.py -k "pickle_map_location" -vResult: 6 passed — Direct, rejection, importance, MCMC, VI, and vector-field posteriors all save on GPU and reload correctly with
map_location="cpu", including sampling andpotential()/log_prob()calls after loading.Also ran:
tests/torchutils_test.py— passedruff check— cleanpyright sbi— cleanThe VI test needed a fix on my side: I trained the posterior before the save/load roundtrip, otherwise
sample()fails after loading. That's the current test in this PR.I used AI tools to help run the tests, and I verified every test locally before pushing.