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""" NormAct (Normalizaiton + Activation Layer) Factory | |
Create norm + act combo modules that attempt to be backwards compatible with separate norm + act | |
isntances in models. Where these are used it will be possible to swap separate BN + act layers with | |
combined modules like IABN or EvoNorms. | |
Hacked together by / Copyright 2020 Ross Wightman | |
""" | |
import types | |
import functools | |
import torch | |
import torch.nn as nn | |
from .evo_norm import EvoNormBatch2d, EvoNormSample2d | |
from .norm_act import BatchNormAct2d, GroupNormAct | |
from .inplace_abn import InplaceAbn | |
_NORM_ACT_TYPES = {BatchNormAct2d, GroupNormAct, EvoNormBatch2d, EvoNormSample2d, InplaceAbn} | |
_NORM_ACT_REQUIRES_ARG = {BatchNormAct2d, GroupNormAct, InplaceAbn} # requires act_layer arg to define act type | |
def get_norm_act_layer(layer_class): | |
layer_class = layer_class.replace('_', '').lower() | |
if layer_class.startswith("batchnorm"): | |
layer = BatchNormAct2d | |
elif layer_class.startswith("groupnorm"): | |
layer = GroupNormAct | |
elif layer_class == "evonormbatch": | |
layer = EvoNormBatch2d | |
elif layer_class == "evonormsample": | |
layer = EvoNormSample2d | |
elif layer_class == "iabn" or layer_class == "inplaceabn": | |
layer = InplaceAbn | |
else: | |
assert False, "Invalid norm_act layer (%s)" % layer_class | |
return layer | |
def create_norm_act(layer_type, num_features, apply_act=True, jit=False, **kwargs): | |
layer_parts = layer_type.split('-') # e.g. batchnorm-leaky_relu | |
assert len(layer_parts) in (1, 2) | |
layer = get_norm_act_layer(layer_parts[0]) | |
#activation_class = layer_parts[1].lower() if len(layer_parts) > 1 else '' # FIXME support string act selection? | |
layer_instance = layer(num_features, apply_act=apply_act, **kwargs) | |
if jit: | |
layer_instance = torch.jit.script(layer_instance) | |
return layer_instance | |
def convert_norm_act_type(norm_layer, act_layer, norm_kwargs=None): | |
assert isinstance(norm_layer, (type, str, types.FunctionType, functools.partial)) | |
assert act_layer is None or isinstance(act_layer, (type, str, types.FunctionType, functools.partial)) | |
norm_act_args = norm_kwargs.copy() if norm_kwargs else {} | |
if isinstance(norm_layer, str): | |
norm_act_layer = get_norm_act_layer(norm_layer) | |
elif norm_layer in _NORM_ACT_TYPES: | |
norm_act_layer = norm_layer | |
elif isinstance(norm_layer, (types.FunctionType, functools.partial)): | |
# assuming this is a lambda/fn/bound partial that creates norm_act layer | |
norm_act_layer = norm_layer | |
else: | |
type_name = norm_layer.__name__.lower() | |
if type_name.startswith('batchnorm'): | |
norm_act_layer = BatchNormAct2d | |
elif type_name.startswith('groupnorm'): | |
norm_act_layer = GroupNormAct | |
else: | |
assert False, f"No equivalent norm_act layer for {type_name}" | |
if norm_act_layer in _NORM_ACT_REQUIRES_ARG: | |
# Must pass `act_layer` through for backwards compat where `act_layer=None` implies no activation. | |
# In the future, may force use of `apply_act` with `act_layer` arg bound to relevant NormAct types | |
# It is intended that functions/partial does not trigger this, they should define act. | |
norm_act_args.update(dict(act_layer=act_layer)) | |
return norm_act_layer, norm_act_args | |