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# Copyright (c) OpenMMLab. All rights reserved.
import warnings
import torch.nn as nn
from mmengine.model import BaseModule
from mmdet.models.backbones import ResNet
from mmdet.models.layers import ResLayer as _ResLayer
from mmdet.registry import MODELS
@MODELS.register_module()
class ResLayer(BaseModule):
def __init__(self,
depth,
stage=3,
stride=2,
dilation=1,
style='pytorch',
norm_cfg=dict(type='BN', requires_grad=True),
norm_eval=True,
with_cp=False,
dcn=None,
pretrained=None,
init_cfg=None):
super(ResLayer, self).__init__(init_cfg)
self.norm_eval = norm_eval
self.norm_cfg = norm_cfg
self.stage = stage
self.fp16_enabled = False
block, stage_blocks = ResNet.arch_settings[depth]
stage_block = stage_blocks[stage]
planes = 64 * 2**stage
inplanes = 64 * 2**(stage - 1) * block.expansion
res_layer = _ResLayer(
block,
inplanes,
planes,
stage_block,
stride=stride,
dilation=dilation,
style=style,
with_cp=with_cp,
norm_cfg=self.norm_cfg,
dcn=dcn)
self.add_module(f'layer{stage + 1}', res_layer)
assert not (init_cfg and pretrained), \
'init_cfg and pretrained cannot be specified at the same time'
if isinstance(pretrained, str):
warnings.warn('DeprecationWarning: pretrained is a deprecated, '
'please use "init_cfg" instead')
self.init_cfg = dict(type='Pretrained', checkpoint=pretrained)
elif pretrained is None:
if init_cfg is None:
self.init_cfg = [
dict(type='Kaiming', layer='Conv2d'),
dict(
type='Constant',
val=1,
layer=['_BatchNorm', 'GroupNorm'])
]
else:
raise TypeError('pretrained must be a str or None')
def forward(self, x):
res_layer = getattr(self, f'layer{self.stage + 1}')
out = res_layer(x)
return out
def train(self, mode=True):
super(ResLayer, self).train(mode)
if self.norm_eval:
for m in self.modules():
if isinstance(m, nn.BatchNorm2d):
m.eval()
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