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from typing import Optional
import warnings
# 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("{} is not a valid value for reduction".format(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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