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wire 2026-09-29
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Repo2RLEnv learns mocha's output format, transformers cleans up MPS and Mamba leftovers

By RepoJournal · Filed · About Hugging Face · Composed from the cited sources · methodology

Repo2RLEnv's JS log parsers read only jest's format and dropped every mocha repo's tasks, while transformers removes a deprecated config flag and an obsolete MPS clone.

log_parsers: read mocha's spec reporter huggingface/Repo2RLEnv

by k21993

A mocha log previously parsed to an empty status map, so mocha repos yielded no tasks at all: the parser only understood jest's format, while mocha prints log-symbols check marks, numbered failures and dashed pending tests with suites nested by indentation and no file header. Mocha is now detected by its `N passing (Xms)` epilogue or check mark, and test names are built from indentation (`Math ...

pr_runtime: give validation's test block stderr, not just stdout huggingface/Repo2RLEnv

by k21993

`_build_stage_script` writes its markers to stdout and `truncated()` appends stderr after the end marker, so any runner reporting on stderr handed `_slice_test_output` an empty string and every candidate was dropped as "no fail-to-pass tests after validation"; on the real runners, jest writes all 26 lines of a verbose run to stderr and nothing to stdout. Validation's test block now folds stderr...

Deprecate the use_mamba_kernels config flag that no longer has any effect (#49155) huggingface/transformers

by Albert Villanova del Moral

The `use_mamba_kernels` config flag no longer has any effect, and it is now deprecated. Code that reads or passes it should stop relying on it.

[MPS] Remove cu_seqlens_k clone workaround for metal-flash-sdpa (#49091) huggingface/transformers

by Irakli Salia

The `cu_seqlens_k` clone workaround for metal-flash-sdpa is gone, along with a bump to the flash sdpa version it depended on.

nix-builder: add support for Torch 2.10-2.12 for Metal huggingface/kernels

by danieldk

The nix-builder gains Torch 2.10 through 2.12 support for Metal specifically: the project prefers covering older Torch (>= 2.9) via the stable ABI, but that ABI does not yet expose everything Metal needs. The rest of the day is small housekeeping: the macOS devshell stops pulling in the direct `cudart` dependency, which does not exist on the platform, and Darwin cache builds disable the opentel...

Quick answers

What shipped in Hugging Face on September 29, 2026?
Repo2RLEnv's JS log parsers read only jest's format and dropped every mocha repo's tasks, while transformers removes a deprecated config flag and an obsolete MPS clone. In total, 22 commits and 23 pull requests landed.
Who contributed to Hugging Face on September 29, 2026?
6 developers shipped this update, including k21993, Yih-Dar, Irakli Salia, Albert Villanova del Moral, guarin, and danieldk.
What were the notable Hugging Face updates?
log_parsers: read mocha's spec reporter, pr_runtime: give validation's test block stderr, not just stdout, and Deprecate the use_mamba_kernels config flag that no longer has any effect (#49155).