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Fabric: add support for 'auto' accelerator #20473

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Fabric: add support for 'auto' accelerator #20473

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865176f
Fabric: add support for 'auto' accelerator
GeminiLn Dec 7, 2024
3949b29
[pre-commit.ci] auto fixes from pre-commit.com hooks
pre-commit-ci[bot] Dec 7, 2024
acb611c
Merge branch 'master' into add-fabric-auto-accelerator
Borda Mar 14, 2025
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10 changes: 9 additions & 1 deletion src/lightning/fabric/cli.py
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Original file line number Diff line number Diff line change
Expand Up @@ -34,7 +34,7 @@
_CLICK_AVAILABLE = RequirementCache("click")
_LIGHTNING_SDK_AVAILABLE = RequirementCache("lightning_sdk")

_SUPPORTED_ACCELERATORS = ("cpu", "gpu", "cuda", "mps", "tpu")
_SUPPORTED_ACCELERATORS = ("cpu", "gpu", "cuda", "mps", "tpu", "auto")


def _get_supported_strategies() -> list[str]:
Expand Down Expand Up @@ -187,6 +187,14 @@ def _set_env_variables(args: Namespace) -> None:

def _get_num_processes(accelerator: str, devices: str) -> int:
"""Parse the `devices` argument to determine how many processes need to be launched on the current machine."""
if accelerator == "auto":
if torch.cuda.is_available():
accelerator = "cuda"
elif getattr(torch.backends, "mps", None) and torch.backends.mps.is_available():
accelerator = "mps"
else:
accelerator = "cpu"

if accelerator == "gpu":
parsed_devices = _parse_gpu_ids(devices, include_cuda=True, include_mps=True)
elif accelerator == "cuda":
Expand Down
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