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pytorch-image-models/timm/models/layers/create_act.py

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5.1 KiB

""" Activation Factory
Hacked together by / Copyright 2020 Ross Wightman
"""
from typing import Union, Callable, Type
from .activations import *
from .activations_jit import *
from .activations_me import *
from .config import is_exportable, is_scriptable, is_no_jit
# PyTorch has an optimized, native 'silu' (aka 'swish') operator as of PyTorch 1.7.
# Also hardsigmoid, hardswish, and soon mish. This code will use native version if present.
# Eventually, the custom SiLU, Mish, Hard*, layers will be removed and only native variants will be used.
_has_silu = 'silu' in dir(torch.nn.functional)
_has_hardswish = 'hardswish' in dir(torch.nn.functional)
_has_hardsigmoid = 'hardsigmoid' in dir(torch.nn.functional)
_has_mish = 'mish' in dir(torch.nn.functional)
_ACT_FN_DEFAULT = dict(
silu=F.silu if _has_silu else swish,
swish=F.silu if _has_silu else swish,
mish=F.mish if _has_mish else mish,
relu=F.relu,
relu6=F.relu6,
leaky_relu=F.leaky_relu,
elu=F.elu,
celu=F.celu,
selu=F.selu,
gelu=gelu,
sigmoid=sigmoid,
tanh=tanh,
hard_sigmoid=F.hardsigmoid if _has_hardsigmoid else hard_sigmoid,
hard_swish=F.hardswish if _has_hardswish else hard_swish,
hard_mish=hard_mish,
)
_ACT_FN_JIT = dict(
silu=F.silu if _has_silu else swish_jit,
swish=F.silu if _has_silu else swish_jit,
mish=F.mish if _has_mish else mish_jit,
hard_sigmoid=F.hardsigmoid if _has_hardsigmoid else hard_sigmoid_jit,
hard_swish=F.hardswish if _has_hardswish else hard_swish_jit,
hard_mish=hard_mish_jit
)
_ACT_FN_ME = dict(
silu=F.silu if _has_silu else swish_me,
swish=F.silu if _has_silu else swish_me,
mish=F.mish if _has_mish else mish_me,
hard_sigmoid=F.hardsigmoid if _has_hardsigmoid else hard_sigmoid_me,
hard_swish=F.hardswish if _has_hardswish else hard_swish_me,
hard_mish=hard_mish_me,
)
_ACT_FNS = (_ACT_FN_ME, _ACT_FN_JIT, _ACT_FN_DEFAULT)
for a in _ACT_FNS:
a.setdefault('hardsigmoid', a.get('hard_sigmoid'))
a.setdefault('hardswish', a.get('hard_swish'))
_ACT_LAYER_DEFAULT = dict(
silu=nn.SiLU if _has_silu else Swish,
swish=nn.SiLU if _has_silu else Swish,
mish=nn.Mish if _has_mish else Mish,
relu=nn.ReLU,
relu6=nn.ReLU6,
leaky_relu=nn.LeakyReLU,
elu=nn.ELU,
prelu=PReLU,
celu=nn.CELU,
selu=nn.SELU,
gelu=GELU,
sigmoid=Sigmoid,
tanh=Tanh,
hard_sigmoid=nn.Hardsigmoid if _has_hardsigmoid else HardSigmoid,
hard_swish=nn.Hardswish if _has_hardswish else HardSwish,
hard_mish=HardMish,
)
_ACT_LAYER_JIT = dict(
silu=nn.SiLU if _has_silu else SwishJit,
swish=nn.SiLU if _has_silu else SwishJit,
mish=nn.Mish if _has_mish else MishJit,
hard_sigmoid=nn.Hardsigmoid if _has_hardsigmoid else HardSigmoidJit,
hard_swish=nn.Hardswish if _has_hardswish else HardSwishJit,
hard_mish=HardMishJit
)
_ACT_LAYER_ME = dict(
silu=nn.SiLU if _has_silu else SwishMe,
swish=nn.SiLU if _has_silu else SwishMe,
mish=nn.Mish if _has_mish else MishMe,
hard_sigmoid=nn.Hardsigmoid if _has_hardsigmoid else HardSigmoidMe,
hard_swish=nn.Hardswish if _has_hardswish else HardSwishMe,
hard_mish=HardMishMe,
)
_ACT_LAYERS = (_ACT_LAYER_ME, _ACT_LAYER_JIT, _ACT_LAYER_DEFAULT)
for a in _ACT_LAYERS:
a.setdefault('hardsigmoid', a.get('hard_sigmoid'))
a.setdefault('hardswish', a.get('hard_swish'))
def get_act_fn(name: Union[Callable, str] = 'relu'):
""" Activation Function Factory
Fetching activation fns by name with this function allows export or torch script friendly
functions to be returned dynamically based on current config.
"""
if not name:
return None
if isinstance(name, Callable):
return name
if not (is_no_jit() or is_exportable() or is_scriptable()):
# If not exporting or scripting the model, first look for a memory-efficient version with
# custom autograd, then fallback
if name in _ACT_FN_ME:
return _ACT_FN_ME[name]
if not (is_no_jit() or is_exportable()):
if name in _ACT_FN_JIT:
return _ACT_FN_JIT[name]
return _ACT_FN_DEFAULT[name]
def get_act_layer(name: Union[Type[nn.Module], str] = 'relu'):
""" Activation Layer Factory
Fetching activation layers by name with this function allows export or torch script friendly
functions to be returned dynamically based on current config.
"""
if not name:
return None
if not isinstance(name, str):
# callable, module, etc
return name
if not (is_no_jit() or is_exportable() or is_scriptable()):
if name in _ACT_LAYER_ME:
return _ACT_LAYER_ME[name]
if not (is_no_jit() or is_exportable()):
if name in _ACT_LAYER_JIT:
return _ACT_LAYER_JIT[name]
return _ACT_LAYER_DEFAULT[name]
def create_act_layer(name: Union[nn.Module, str], inplace=None, **kwargs):
act_layer = get_act_layer(name)
if act_layer is None:
return None
if inplace is None:
return act_layer(**kwargs)
try:
return act_layer(inplace=inplace, **kwargs)
except TypeError:
# recover if act layer doesn't have inplace arg
return act_layer(**kwargs)