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9e366ac | 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 | """Shared safety scaffolding for the opt-in fused-kernel installers (CCE, custom RMSNorm).
Both run a numeric parity check on the live GPU before patching and only patch if it matches eager
within tolerance — correctness over speed. The check must not perturb the trainer's global RNG (it
runs after the model is loaded, inside the trainer's RNG stream), so it seeds under a local fork.
"""
from __future__ import annotations
from collections.abc import Callable
def run_gpu_self_test(body: Callable[[], bool], *, seed: int = 0) -> bool:
"""Run ``body`` (a numeric-parity check returning bool) on the live GPU under a forked RNG.
Returns False when CUDA is unavailable. Seeds with ``seed`` inside ``torch.random.fork_rng`` so
seeding the check doesn't disturb the trainer's global CPU/CUDA RNG stream.
"""
import torch
if not torch.cuda.is_available():
return False
with torch.random.fork_rng(devices=[torch.cuda.current_device()]):
torch.manual_seed(seed)
return body()
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