Who contributed to Google on July 25, 2026?

6 developers shipped this update, including Matthew Johnson, Sergei Lebedev, copybara-service, Heba Alazzeh, suztomo, and sakthivelmanii.

What were the notable Google updates?

[remat3] fix failures / regressions, work with mutable arrays, [remat3] fix failures / regressions, work with mutable arrays, and feat(api-core): centralize rest transcoding helpers (#17765).

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The Wire · Showcase

JAX FIXES REMAT3 CONSTANT HANDLING CRASH, GOOGLE CLOUD PYTHON CENTRALIZES REST TRANSCODING

By RepoJournal · Filed 06:58 UTC on July 25, 2026 · About Google

6 people shipped this

Matthew Johnson @mattjj 2 cited

copybara-service @copybara-service 2 cited

Heba Alazzeh @hebaalazzeh 2 cited

suztomo @suztomo 2 cited

Sergei Lebedev @superbobry

sakthivelmanii @sakthivelmanii

Matthew Johnson patched a critical remat3 regression where closed-over constants were silently dropped, causing immediate crashes in production rematerialization pipelines [ref:1].

The remat3 flag flip exposed a subtle bug in _remat_jaxpr: to_jaxpr returns both jaxpr and constants, but the consts were discarded, leaving Jaxpr objects with constvars but no attached values [1] [2]. Any rematted computation capturing arrays (remat-of-jit patterns) would crash in pjit_staging_rule with mismatched input counts. Johnson's fix attaches constants via with_consts, mirroring how jaxpr constants are handled elsewhere. On the Google Cloud Python side, Heba Alazzeh shipped a centralized REST transcoding helper under google.api_core.gapic_v1.rest_transcoding [3] [4], collapsing redundant code from REST transport constructors and reducing serialization errors. Simultaneously, Mosaic GPU gained a layout inference rule for MemRefReshapeOp [5] and refactored GPU Interpret Mode to use GpuClockBundle for cleaner, less error-prone clock management [6]. Cloud Python also absorbed this week's API definition updates [7] and added agent identity credentials v1beta [8]. Across both repos, 27 commits and 23 PRs landed in the last 24 hours.

Action items

→ Test any remat3 pipelines that capture external arrays immediately google/jax [immediate]
→ Review REST transport code for integration with the new centralized transcode() helper googleapis/google-cloud-python [plan]
→ Monitor Mosaic GPU reshape handling for tiled layout changes google/jax [monitor]

References

[1] [remat3] fix failures / regressions, work with mutable arrays google/jax
[2] [remat3] fix failures / regressions, work with mutable arrays ↗ google/jax
[3] feat(api-core): centralize rest transcoding helpers (#17765) googleapis/google-cloud-python
[4] feat(api-core): centralize rest transcoding helpers ↗ googleapis/google-cloud-python
[5] [Mosaic GPU] Add layout inference rule for `MemRefReshapeOp`. ↗ google/jax
[6] [Mosaic GPU] Refactor GPU Interpret Mode to use `GpuClockBundle`s ↗ google/jax
[7] feat: update googleapis and regenerate ↗ googleapis/google-cloud-python
[8] feat(google/cloud/agentidentitycredentials/v1beta): add google-cloud-agentidentitycredentials v1beta ↗ googleapis/google-cloud-python

Quick answers

What shipped in Google on July 25, 2026?: Matthew Johnson patched a critical remat3 regression where closed-over constants were silently dropped, causing immediate crashes in production rematerialization pipelines [ref:1]. In total, 27 commits and 23 pull requests landed.
Who contributed to Google on July 25, 2026?: 6 developers shipped this update, including Matthew Johnson, Sergei Lebedev, copybara-service, Heba Alazzeh, suztomo, and sakthivelmanii.
What were the notable Google updates?: [remat3] fix failures / regressions, work with mutable arrays, [remat3] fix failures / regressions, work with mutable arrays, and feat(api-core): centralize rest transcoding helpers (#17765).

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