Ross Wightman
5 years ago
committed by
GitHub
commit
46471df7b2
@ -0,0 +1,121 @@
|
||||
'''
|
||||
ECA module from ECAnet
|
||||
original paper: ECA-Net: Efficient Channel Attention for Deep Convolutional Neural Networks
|
||||
https://arxiv.org/abs/1910.03151
|
||||
|
||||
https://github.com/BangguWu/ECANet
|
||||
original ECA model borrowed from original github
|
||||
modified circular ECA implementation and
|
||||
adoptation for use in pytorch image models package
|
||||
by Chris Ha https://github.com/VRandme
|
||||
|
||||
MIT License
|
||||
|
||||
Copyright (c) 2019 BangguWu, Qilong Wang
|
||||
|
||||
Permission is hereby granted, free of charge, to any person obtaining a copy
|
||||
of this software and associated documentation files (the "Software"), to deal
|
||||
in the Software without restriction, including without limitation the rights
|
||||
to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
|
||||
copies of the Software, and to permit persons to whom the Software is
|
||||
furnished to do so, subject to the following conditions:
|
||||
|
||||
The above copyright notice and this permission notice shall be included in all
|
||||
copies or substantial portions of the Software.
|
||||
|
||||
THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
|
||||
IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
|
||||
FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
|
||||
AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
|
||||
LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
|
||||
OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
|
||||
SOFTWARE.
|
||||
'''
|
||||
import math
|
||||
from torch import nn
|
||||
import torch.nn.functional as F
|
||||
|
||||
class EcaModule(nn.Module):
|
||||
"""Constructs a ECA module.
|
||||
|
||||
Args:
|
||||
channel: Number of channels of the input feature map for use in adaptive kernel sizes
|
||||
for actual calculations according to channel.
|
||||
gamma, beta: when channel is given parameters of mapping function
|
||||
refer to original paper https://arxiv.org/pdf/1910.03151.pdf
|
||||
(default=None. if channel size not given, use k_size given for kernel size.)
|
||||
k_size: Adaptive selection of kernel size (default=3)
|
||||
"""
|
||||
def __init__(self, channel=None, k_size=3, gamma=2, beta=1):
|
||||
super(EcaModule, self).__init__()
|
||||
assert k_size % 2 == 1
|
||||
|
||||
if channel is not None:
|
||||
t = int(abs(math.log(channel, 2)+beta) / gamma)
|
||||
k_size = t if t % 2 else t + 1
|
||||
|
||||
self.avg_pool = nn.AdaptiveAvgPool2d(1)
|
||||
self.conv = nn.Conv1d(1, 1, kernel_size=k_size, padding=(k_size - 1) // 2, bias=False)
|
||||
self.sigmoid = nn.Sigmoid()
|
||||
|
||||
def forward(self, x):
|
||||
# feature descriptor on the global spatial information
|
||||
y = self.avg_pool(x)
|
||||
# reshape for convolution
|
||||
y = y.view(x.shape[0], 1, -1)
|
||||
# Two different branches of ECA module
|
||||
y = self.conv(y)
|
||||
# Multi-scale information fusion
|
||||
y = self.sigmoid(y.view(x.shape[0], -1, 1, 1))
|
||||
return x * y.expand_as(x)
|
||||
|
||||
class CecaModule(nn.Module):
|
||||
"""Constructs a circular ECA module.
|
||||
the primary difference is that the conv uses a circular padding rather than zero padding.
|
||||
This is because unlike images, the channels themselves do not have inherent ordering nor
|
||||
locality. Although this module in essence, applies such an assumption, it is unnecessary
|
||||
to limit the channels on either "edge" from being circularly adapted to each other.
|
||||
This will fundamentally increase connectivity and possibly increase performance metrics
|
||||
(accuracy, robustness), without signficantly impacting resource metrics
|
||||
(parameter size, throughput,latency, etc)
|
||||
|
||||
Args:
|
||||
channel: Number of channels of the input feature map for use in adaptive kernel sizes
|
||||
for actual calculations according to channel.
|
||||
gamma, beta: when channel is given parameters of mapping function
|
||||
refer to original paper https://arxiv.org/pdf/1910.03151.pdf
|
||||
(default=None. if channel size not given, use k_size given for kernel size.)
|
||||
k_size: Adaptive selection of kernel size (default=3)
|
||||
"""
|
||||
|
||||
def __init__(self, channel=None, k_size=3, gamma=2, beta=1):
|
||||
super(CecaModule, self).__init__()
|
||||
assert k_size % 2 == 1
|
||||
|
||||
if channel is not None:
|
||||
t = int(abs(math.log(channel, 2)+beta) / gamma)
|
||||
k_size = t if t % 2 else t + 1
|
||||
|
||||
self.avg_pool = nn.AdaptiveAvgPool2d(1)
|
||||
#pytorch circular padding mode is bugged as of pytorch 1.4
|
||||
#see https://github.com/pytorch/pytorch/pull/17240
|
||||
|
||||
#implement manual circular padding
|
||||
self.conv = nn.Conv1d(1, 1, kernel_size=k_size, padding=0, bias=False)
|
||||
self.padding = (k_size - 1) // 2
|
||||
self.sigmoid = nn.Sigmoid()
|
||||
|
||||
def forward(self, x):
|
||||
# feature descriptor on the global spatial information
|
||||
y = self.avg_pool(x)
|
||||
|
||||
#manually implement circular padding, F.pad does not seemed to be bugged
|
||||
y = F.pad(y.view(x.shape[0], 1, -1), (self.padding, self.padding), mode='circular')
|
||||
|
||||
# Two different branches of ECA module
|
||||
y = self.conv(y)
|
||||
|
||||
# Multi-scale information fusion
|
||||
y = self.sigmoid(y.view(x.shape[0], -1, 1, 1))
|
||||
|
||||
return x * y.expand_as(x)
|
||||
Loading…
Reference in new issue