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enable setting flags via env vars like JAX_CPU_COLLECTIVES_IMPLEMENTATION #26103

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enable setting flags via env vars like JAX_CPU_COLLECTIVES_IMPLEMENTATION #26103

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11 changes: 9 additions & 2 deletions jax/_src/config.py
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Original file line number Diff line number Diff line change
Expand Up @@ -778,36 +778,43 @@ def _set(self, value: _T) -> None:

def bool_flag(name, default, *args, **kwargs) -> Flag[bool]:
update_hook = kwargs.pop("update_hook", None)
default = bool(os.getenv(name.upper(), default))
holder = Flag(name, default, update_hook)
config.add_option(name, holder, bool, args, kwargs)
return holder


def int_flag(name, default, *args, **kwargs) -> Flag[int]:
update_hook = kwargs.pop("update_hook", None)
default = int(os.getenv(name.upper(), default))
holder = Flag(name, default, update_hook)
config.add_option(name, holder, int, args, kwargs)
return holder


def float_flag(name, default, *args, **kwargs) -> Flag[float]:
update_hook = kwargs.pop("update_hook", None)
default = float(os.getenv(name.upper(), default))
holder = Flag(name, default, update_hook)
config.add_option(name, holder, float, args, kwargs)
return holder


def string_flag(name, default, *args, **kwargs) -> Flag[str]:
update_hook = kwargs.pop("update_hook", None)
default = os.getenv(name.upper(), default)
holder = Flag(name, default, update_hook)
config.add_option(name, holder, str, args, kwargs)
return holder


def enum_flag(name, default, *args, **kwargs) -> Flag[str]:
def enum_flag(name, default, enum_values, *args, **kwargs) -> Flag[str]:
update_hook = kwargs.pop("update_hook", None)
default = os.getenv(name.upper(), default)
if default not in enum_values:
raise ValueError(f"Invalid value \"{default}\" for JAX flag {name}")
holder = Flag(name, default, update_hook)
config.add_option(name, holder, 'enum', args, kwargs)
config.add_option(name, holder, 'enum', (enum_values, *args), kwargs)
return holder


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