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e7a7275 | 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 27 28 29 30 31 32 33 34 35 36 37 38 | """
Derived from Andrej Karpathy's nanochat project.
MIT License
Copyright (c) 2025 Andrej Karpathy
Permission is hereby granted, free of charge, to any person obtaining a copy
of this software and associated documentation files (the "Software"), to deal
in the Software without restriction, including without limitation the rights
to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
copies of the Software, and to permit persons to whom the Software is
furnished to do so, subject to the following conditions:
The above copyright notice and this permission notice shall be included in all
copies or substantial portions of the Software.
"""
from __future__ import annotations
import os
import torch
def assert_mps_only() -> torch.device:
if os.environ.get("PYTORCH_ENABLE_MPS_FALLBACK") == "1":
raise SystemExit(
"Refusing to run: PYTORCH_ENABLE_MPS_FALLBACK=1 could execute CPU fallbacks."
)
if not torch.backends.mps.is_built():
raise SystemExit("PyTorch was not built with MPS. Stopping.")
if not torch.backends.mps.is_available():
raise SystemExit("MPS is not available. Stopping before any Torch experiment work.")
device = torch.device("mps")
torch.set_default_device(device)
return device
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