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import warnings
from typing import Optional
# NB: Keep this file in sync with enums in aten/src/ATen/core/Reduction.h
def get_enum(reduction: str) -> int:
if reduction == "none":
ret = 0
elif reduction == "mean":
ret = 1
elif reduction == "elementwise_mean":
warnings.warn(
"reduction='elementwise_mean' is deprecated. "
"Please use reduction='mean' instead."
)
ret = 1
elif reduction == "sum":
ret = 2
else:
ret = -1 # TODO: remove once JIT exceptions support control flow
raise ValueError(f"{reduction} is not a valid value for reduction")
return ret
# In order to support previous versions, accept boolean size_average and reduce
# and convert them into the new constants for now
# We use these functions in torch/legacy as well, in which case we'll silence the warning
def legacy_get_string(
size_average: Optional[bool],
reduce: Optional[bool],
emit_warning: bool = True,
) -> str:
warning = "size_average and reduce args will be deprecated, please use reduction='{}' instead."
if size_average is None:
size_average = True
if reduce is None:
reduce = True
if size_average and reduce:
ret = "mean"
elif reduce:
ret = "sum"
else:
ret = "none"
if emit_warning:
warnings.warn(warning.format(ret))
return ret
def legacy_get_enum(
size_average: Optional[bool],
reduce: Optional[bool],
emit_warning: bool = True,
) -> int:
return get_enum(legacy_get_string(size_average, reduce, emit_warning))
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