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wire 2026-08-01
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JAX REFACTORS CORE VJP SYSTEM WHILE CLOUD PYTHON FIXES SPANNER JSON BUGS

By RepoJournal · Filed · About Google · Composed from the cited sources · methodology

mattjj sakthivelmanii copybara-service hebaalazzeh mraunak Google Team Member Matthew Tang
8 people shipped this
mattjj @mattjj 3 cited sakthivelmanii @sakthivelmanii 2 cited copybara-service @copybara-service 1 cited hebaalazzeh @hebaalazzeh 1 cited mraunak @mraunak Google Team Member @google-genai-bot Matthew Tang @matthew29tang chalmerlowe @chalmerlowe

JAX's custom_vjp rules gain logging capability as the team strips deprecated code, while google-cloud-python patches critical JsonObject serialization breaks across nested structures.

JAX shipped a major VJP refactor [1] that implements defvjp_with_logs on both classic custom_vjp and the newer custom_vjp3, letting gradient rules log computation steps without breaking downstream abstractions. The team is simultaneously cleaning house, removing the deprecated QDD module [2] and subprocess test code [3] to reduce maintenance surface. On GPU acceleration, Pallas now transparently routes gmem-to-smem copies through TMA on Hopper+ hardware while falling back to cp.async on older architectures [4], a quiet win for multi-GPU workloads. Over on google-cloud-python, a critical fix landed for Spanner's JsonObject [5] that restores standard Python container protocols (len, bool, iter, getitem) on array/scalar/null variants, addressing data erasure bugs in nested serialization [6]. The cloud team also refactored generator templates to delegate REST transcoding to google-api-core [7], centralizing request handling logic that was previously scattered across three separate helper functions. Activity across the three repos: 44 commits, 36 PRs in the last 24 hours.

Action items

References

  1. [1] [vjp3] add defvjp_with_logs so custom_vjp rules can log ↗ google/jax
  2. [2] remove qdd ↗ google/jax
  3. [3] remove os.subprocess test ↗ google/jax
  4. [4] [pallas:mgpu] `copy_gmem_to_smem` now transparently uses TMA on Hopper+ and cp.async on older architectures ↗ google/jax
  5. [5] fix(spanner): implement dict protocol and nested unwrapping for JsonObject ↗ googleapis/google-cloud-python
  6. [6] fix(spanner): implement dict protocol and nested unwrapping for JsonObject (#17915) ↗ googleapis/google-cloud-python
  7. [7] feat(generator): delegate REST transcoding to google-api-core ↗ googleapis/google-cloud-python

$ ls google/reviews/ # the step-back reads

the week in review JAX drops legacy IFRT device APIs, google-auth adds 3.15 the month in review JAX free-threading push reshapes 0.11.2 and 0.12 cleanup
Full archive → Weekly reviews →

Quick answers

What shipped in Google on August 1, 2026?
JAX's custom_vjp rules gain logging capability as the team strips deprecated code, while google-cloud-python patches critical JsonObject serialization breaks across nested structures. In total, 44 commits and 36 pull requests landed.
Who contributed to Google on August 1, 2026?
8 developers shipped this update, including mattjj, mraunak, copybara-service, Google Team Member, Matthew Tang, hebaalazzeh, chalmerlowe, and sakthivelmanii.
What were the notable Google updates?
[vjp3] add defvjp_with_logs so custom_vjp rules can log, remove qdd, and remove os.subprocess test.
♥

$ log Google --recent

JAX pins OpenXLA revision, disables overlap_test against older libtpu 5 shipped JAX adds type-2 and type-3 Hermitian eigensolves, lexsort batching cuts unique compile time 69 shipped JAX hijax flags read at call time, Spanner stops deleting multiplexed sessions 112 shipped Vertex AI client timeout fix, Compute v1 API regenerated 87 shipped

$ log --all # elsewhere on the wire

@vuejs Vue language tools stop calling registerHooks on buggy Node builds @openclaw OpenClaw's deslop sweep removes 1,000+ production lines

$ ls showcases/

Rails Django Laravel Node.js Go Vercel Vue.js Kubernetes HashiCorp Arch Linux Linux Anthropic

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