unsloth/studio/backend
Roland Tannous 79adfd9c71
studio: skip flash-attn install on Blackwell GPUs (sm_100+) (#5420)
* studio: skip flash-attn install on Blackwell GPUs (sm_100+)

Dao-AILab does not publish prebuilt flash-attn wheels for sm_100, sm_120,
or sm_121, and the older-arch wheels fail to load on Blackwell. Add a
shared has_blackwell_gpu() helper and gate both the install-time
(install_python_stack._ensure_flash_attn) and runtime
(worker._ensure_flash_attn_for_long_context) paths on it. Detection uses
nvidia-smi --query-gpu=compute_cap, which works on Linux and Windows.

* test: stub has_blackwell_gpu in pre-existing runtime flash-attn tests

prefers_prebuilt_wheel and falls_back_to_pypi exercise the install
paths that the Blackwell guard now short-circuits. Make them explicit
about non-Blackwell so they pass on real Blackwell hosts.

* studio: cache has_blackwell_gpu, skip Blackwell warning under NO_TORCH

- Wrap has_blackwell_gpu in functools.lru_cache so repeated calls in a
  single process avoid redundant nvidia-smi spawns. Tests clear the
  cache via setup_method/teardown_method.
- In _ensure_flash_attn, run the NO_TORCH short-circuit before the
  Blackwell check so GGUF-only users (who never install torch anyway)
  do not see a Blackwell warning. Blackwell check still runs above the
  IS_WINDOWS / IS_MACOS gates so Blackwell-on-Windows users still see
  the explicit reason rather than a silent OS skip.

* [pre-commit.ci] auto fixes from pre-commit.com hooks

for more information, see https://pre-commit.ci

* test: add has_blackwell_gpu to mlx worker test wheel_utils stub

test_mlx_training_worker_config loads worker.py against a hand-rolled
utils.wheel_utils stub. Adding has_blackwell_gpu to the stub symbol
list so worker's import line resolves.

---------

Co-authored-by: pre-commit-ci[bot] <66853113+pre-commit-ci[bot]@users.noreply.github.com>
2026-05-14 18:13:50 +04:00
..
assets Add Qwen3.6 inference defaults for Studio (#5065) 2026-04-16 11:42:42 -07:00
auth studio: security and hardening pass (auth rate-limit, sandbox, path containment, schema validation, headers) (#5375) 2026-05-13 06:12:18 -07:00
core studio: skip flash-attn install on Blackwell GPUs (sm_100+) (#5420) 2026-05-14 18:13:50 +04:00
loggers Studio: stop truncating long log lines as suspected base64 (#5335) 2026-05-08 13:07:18 +04:00
models studio: drop unused max_grad_value schema + route plumbing (#5424) 2026-05-14 05:43:58 -07:00
plugins fix(gh_client): fail fast on 401/403 auth errors instead of retrying forever (#5325) (#5329) 2026-05-08 21:57:41 +04:00
requirements studio: API external provider support for chat (OpenAI, Mistral, Gemini, Cohere, Anthropic, OpenRouter, DeepSeek, custom providers) (#4706) 2026-05-14 16:13:59 +04:00
routes studio: drop unused max_grad_value schema + route plumbing (#5424) 2026-05-14 05:43:58 -07:00
state unsloth run: add --enable-tools/--disable-tools server-side tool policy (#5277) 2026-05-05 12:45:15 +04:00
storage studio: API external provider support for chat (OpenAI, Mistral, Gemini, Cohere, Anthropic, OpenRouter, DeepSeek, custom providers) (#4706) 2026-05-14 16:13:59 +04:00
tests studio: skip flash-attn install on Blackwell GPUs (sm_100+) (#5420) 2026-05-14 18:13:50 +04:00
utils studio: skip flash-attn install on Blackwell GPUs (sm_100+) (#5420) 2026-05-14 18:13:50 +04:00
__init__.py Final cleanup 2026-03-12 18:28:04 +00:00
_platform_compat.py Fix Studio crash on Anaconda/conda-forge Python (#4484) 2026-03-22 05:36:55 -07:00
colab.py Fix/studio colab button message: Add fallback message for Colab Studio button when proxy URL fails (#4866) 2026-04-05 21:57:45 -07:00
main.py studio: API external provider support for chat (OpenAI, Mistral, Gemini, Cohere, Anthropic, OpenRouter, DeepSeek, custom providers) (#4706) 2026-05-14 16:13:59 +04:00
run.py studio: security and hardening pass (auth rate-limit, sandbox, path containment, schema validation, headers) (#5375) 2026-05-13 06:12:18 -07:00
startup_banner.py studio: unify Windows installer/setup logging style, verbosity controls, and startup messaging (#4651) 2026-03-30 00:53:23 -07:00