[albertvillanova]

This PR moves the tests_min_versions CI job to Python 3.11 and pins huggingface_hub, numpy, pandas, psutil, pyarrow and pyyaml at their pyproject.toml floors, so the job tests every declared floor exactly.

Motivation

The job ran on Python 3.13 (#7648), where numpy 1.26.0, pandas 2.1.1 and pyyaml 6.0.1 have no wheels, so it could not pin the floors declared in #7713. Python 3.11 is the oldest supported Python, and every floor installs on it.

Solution

Moving the job keeps a single minimum-versions job with a single pin list, instead of adding a second, nightly one on 3.11 (#7744). Python 3.13 is still tested on every PR with the latest dependencies; only the combination of minimum versions with 3.13 goes away. Over the last 57 nightly runs of the Python versions workflow, no failure was specific to one Python version.

Changes

• Run tests_min_versions on Python 3.11
• Pin huggingface_hub==0.34.0, numpy==1.26.0, pandas==2.1.1, psutil==5.9.4, pyarrow==21.0.0 and pyyaml==6.0.1

Depends on

• Read and write text files as UTF-8 in tests #7764

With every floor pinned on Python 3.11, the job passes except for test_examples_index_matches_folders (2055 passed, 1 failed: https://github.com/huggingface/trl/actions/runs/38909894519/job/117002780666). torch 2.6.0 ships NVRTC 12.4, which can leave an xdist worker's locale as C (#7720), and that test reads a non-ASCII doc without an explicit encoding. The failure depends on which xdist worker the test lands on, so it is not deterministic. #7764 makes it read the file as UTF-8. The failure is not related to the floors.

---

Note

Low Risk
CI-only workflow changes; no runtime library or application code is modified.

Overview
Moves the tests_min_versions CI job from Python 3.13 to 3.11 (oldest supported per pyproject.toml) so floor versions like numpy==1.26.0 and pandas==2.1.1 can install with wheels instead of failing on 3.13.

The job’s uv pip install step now pins every declared minimum alongside the existing ML stack pins: huggingface_hub==0.34.0, numpy==1.26.0, pandas==2.1.1, psutil==5.9.4, pyarrow==21.0.0, and pyyaml==6.0.1, with a short comment that 3.11 is intentional for exact floor testing. Other test jobs stay on 3.13 with latest deps.

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[bot-ci-comment]

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[qgallouedec]

Thanks! If we move this job to 3.11 instead (see #7744), the pins can just be the floors, so I'd hold this one until we settle that.

[albertvillanova]

Done: the job now runs on Python 3.11, and every pin is exactly its pyproject.toml floor.

[albertvillanova]

CI is red: tests/test_examples_index.py::test_examples_index_matches_folders fails in the minimum-versions job with UnicodeDecodeError: 'ascii' codec can't decode byte 0xe2: https://github.com/huggingface/trl/actions/runs/38909894519/job/117002780666

The floors are not the cause: the other 2055 tests pass with every dependency pinned at its floor on Python 3.11. torch 2.6.0 ships NVRTC 12.4, which can leave an xdist worker's locale as C (#7720), and this test reads a non-ASCII doc without an explicit encoding. The failure depends on which xdist worker the test lands on, so it is not deterministic.

This PR depends on:

• Read and write text files as UTF-8 in tests #7764

[qgallouedec]

Good.