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295 lines
9.5 KiB
295 lines
9.5 KiB
""" Pytorch Inception-V4 implementation
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Sourced from https://github.com/Cadene/tensorflow-model-zoo.torch (MIT License) which is
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based upon Google's Tensorflow implementation and pretrained weights (Apache 2.0 License)
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"""
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import torch
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import torch.nn as nn
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import torch.nn.functional as F
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import torch.utils.model_zoo as model_zoo
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from .adaptive_avgmax_pool import *
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model_urls = {
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'imagenet': 'http://webia.lip6.fr/~cadene/Downloads/inceptionv4-97ef9c30.pth'
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}
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class BasicConv2d(nn.Module):
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def __init__(self, in_planes, out_planes, kernel_size, stride, padding=0):
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super(BasicConv2d, self).__init__()
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self.conv = nn.Conv2d(
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in_planes, out_planes, kernel_size=kernel_size, stride=stride, padding=padding, bias=False)
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self.bn = nn.BatchNorm2d(out_planes, eps=0.001)
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self.relu = nn.ReLU(inplace=True)
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def forward(self, x):
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x = self.conv(x)
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x = self.bn(x)
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x = self.relu(x)
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return x
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class Mixed_3a(nn.Module):
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def __init__(self):
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super(Mixed_3a, self).__init__()
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self.maxpool = nn.MaxPool2d(3, stride=2)
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self.conv = BasicConv2d(64, 96, kernel_size=3, stride=2)
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def forward(self, x):
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x0 = self.maxpool(x)
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x1 = self.conv(x)
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out = torch.cat((x0, x1), 1)
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return out
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class Mixed_4a(nn.Module):
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def __init__(self):
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super(Mixed_4a, self).__init__()
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self.branch0 = nn.Sequential(
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BasicConv2d(160, 64, kernel_size=1, stride=1),
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BasicConv2d(64, 96, kernel_size=3, stride=1)
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)
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self.branch1 = nn.Sequential(
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BasicConv2d(160, 64, kernel_size=1, stride=1),
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BasicConv2d(64, 64, kernel_size=(1, 7), stride=1, padding=(0, 3)),
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BasicConv2d(64, 64, kernel_size=(7, 1), stride=1, padding=(3, 0)),
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BasicConv2d(64, 96, kernel_size=(3, 3), stride=1)
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)
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def forward(self, x):
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x0 = self.branch0(x)
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x1 = self.branch1(x)
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out = torch.cat((x0, x1), 1)
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return out
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class Mixed_5a(nn.Module):
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def __init__(self):
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super(Mixed_5a, self).__init__()
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self.conv = BasicConv2d(192, 192, kernel_size=3, stride=2)
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self.maxpool = nn.MaxPool2d(3, stride=2)
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def forward(self, x):
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x0 = self.conv(x)
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x1 = self.maxpool(x)
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out = torch.cat((x0, x1), 1)
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return out
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class Inception_A(nn.Module):
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def __init__(self):
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super(Inception_A, self).__init__()
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self.branch0 = BasicConv2d(384, 96, kernel_size=1, stride=1)
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self.branch1 = nn.Sequential(
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BasicConv2d(384, 64, kernel_size=1, stride=1),
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BasicConv2d(64, 96, kernel_size=3, stride=1, padding=1)
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)
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self.branch2 = nn.Sequential(
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BasicConv2d(384, 64, kernel_size=1, stride=1),
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BasicConv2d(64, 96, kernel_size=3, stride=1, padding=1),
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BasicConv2d(96, 96, kernel_size=3, stride=1, padding=1)
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)
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self.branch3 = nn.Sequential(
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nn.AvgPool2d(3, stride=1, padding=1, count_include_pad=False),
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BasicConv2d(384, 96, kernel_size=1, stride=1)
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)
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def forward(self, x):
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x0 = self.branch0(x)
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x1 = self.branch1(x)
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x2 = self.branch2(x)
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x3 = self.branch3(x)
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out = torch.cat((x0, x1, x2, x3), 1)
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return out
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class Reduction_A(nn.Module):
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def __init__(self):
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super(Reduction_A, self).__init__()
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self.branch0 = BasicConv2d(384, 384, kernel_size=3, stride=2)
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self.branch1 = nn.Sequential(
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BasicConv2d(384, 192, kernel_size=1, stride=1),
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BasicConv2d(192, 224, kernel_size=3, stride=1, padding=1),
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BasicConv2d(224, 256, kernel_size=3, stride=2)
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)
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self.branch2 = nn.MaxPool2d(3, stride=2)
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def forward(self, x):
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x0 = self.branch0(x)
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x1 = self.branch1(x)
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x2 = self.branch2(x)
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out = torch.cat((x0, x1, x2), 1)
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return out
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class Inception_B(nn.Module):
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def __init__(self):
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super(Inception_B, self).__init__()
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self.branch0 = BasicConv2d(1024, 384, kernel_size=1, stride=1)
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self.branch1 = nn.Sequential(
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BasicConv2d(1024, 192, kernel_size=1, stride=1),
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BasicConv2d(192, 224, kernel_size=(1, 7), stride=1, padding=(0, 3)),
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BasicConv2d(224, 256, kernel_size=(7, 1), stride=1, padding=(3, 0))
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)
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self.branch2 = nn.Sequential(
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BasicConv2d(1024, 192, kernel_size=1, stride=1),
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BasicConv2d(192, 192, kernel_size=(7, 1), stride=1, padding=(3, 0)),
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BasicConv2d(192, 224, kernel_size=(1, 7), stride=1, padding=(0, 3)),
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BasicConv2d(224, 224, kernel_size=(7, 1), stride=1, padding=(3, 0)),
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BasicConv2d(224, 256, kernel_size=(1, 7), stride=1, padding=(0, 3))
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)
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self.branch3 = nn.Sequential(
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nn.AvgPool2d(3, stride=1, padding=1, count_include_pad=False),
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BasicConv2d(1024, 128, kernel_size=1, stride=1)
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)
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def forward(self, x):
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x0 = self.branch0(x)
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x1 = self.branch1(x)
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x2 = self.branch2(x)
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x3 = self.branch3(x)
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out = torch.cat((x0, x1, x2, x3), 1)
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return out
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class Reduction_B(nn.Module):
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def __init__(self):
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super(Reduction_B, self).__init__()
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self.branch0 = nn.Sequential(
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BasicConv2d(1024, 192, kernel_size=1, stride=1),
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BasicConv2d(192, 192, kernel_size=3, stride=2)
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)
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self.branch1 = nn.Sequential(
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BasicConv2d(1024, 256, kernel_size=1, stride=1),
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BasicConv2d(256, 256, kernel_size=(1, 7), stride=1, padding=(0, 3)),
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BasicConv2d(256, 320, kernel_size=(7, 1), stride=1, padding=(3, 0)),
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BasicConv2d(320, 320, kernel_size=3, stride=2)
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)
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self.branch2 = nn.MaxPool2d(3, stride=2)
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def forward(self, x):
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x0 = self.branch0(x)
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x1 = self.branch1(x)
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x2 = self.branch2(x)
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out = torch.cat((x0, x1, x2), 1)
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return out
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class Inception_C(nn.Module):
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def __init__(self):
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super(Inception_C, self).__init__()
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self.branch0 = BasicConv2d(1536, 256, kernel_size=1, stride=1)
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self.branch1_0 = BasicConv2d(1536, 384, kernel_size=1, stride=1)
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self.branch1_1a = BasicConv2d(384, 256, kernel_size=(1, 3), stride=1, padding=(0, 1))
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self.branch1_1b = BasicConv2d(384, 256, kernel_size=(3, 1), stride=1, padding=(1, 0))
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self.branch2_0 = BasicConv2d(1536, 384, kernel_size=1, stride=1)
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self.branch2_1 = BasicConv2d(384, 448, kernel_size=(3, 1), stride=1, padding=(1, 0))
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self.branch2_2 = BasicConv2d(448, 512, kernel_size=(1, 3), stride=1, padding=(0, 1))
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self.branch2_3a = BasicConv2d(512, 256, kernel_size=(1, 3), stride=1, padding=(0, 1))
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self.branch2_3b = BasicConv2d(512, 256, kernel_size=(3, 1), stride=1, padding=(1, 0))
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self.branch3 = nn.Sequential(
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nn.AvgPool2d(3, stride=1, padding=1, count_include_pad=False),
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BasicConv2d(1536, 256, kernel_size=1, stride=1)
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)
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def forward(self, x):
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x0 = self.branch0(x)
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x1_0 = self.branch1_0(x)
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x1_1a = self.branch1_1a(x1_0)
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x1_1b = self.branch1_1b(x1_0)
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x1 = torch.cat((x1_1a, x1_1b), 1)
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x2_0 = self.branch2_0(x)
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x2_1 = self.branch2_1(x2_0)
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x2_2 = self.branch2_2(x2_1)
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x2_3a = self.branch2_3a(x2_2)
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x2_3b = self.branch2_3b(x2_2)
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x2 = torch.cat((x2_3a, x2_3b), 1)
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x3 = self.branch3(x)
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out = torch.cat((x0, x1, x2, x3), 1)
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return out
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class InceptionV4(nn.Module):
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def __init__(self, num_classes=1001, drop_rate=0., global_pool='avg'):
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super(InceptionV4, self).__init__()
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self.drop_rate = drop_rate
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self.global_pool = global_pool
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self.num_classes = num_classes
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self.features = nn.Sequential(
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BasicConv2d(3, 32, kernel_size=3, stride=2),
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BasicConv2d(32, 32, kernel_size=3, stride=1),
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BasicConv2d(32, 64, kernel_size=3, stride=1, padding=1),
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Mixed_3a(),
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Mixed_4a(),
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Mixed_5a(),
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Inception_A(),
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Inception_A(),
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Inception_A(),
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Inception_A(),
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Reduction_A(), # Mixed_6a
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Inception_B(),
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Inception_B(),
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Inception_B(),
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Inception_B(),
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Inception_B(),
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Inception_B(),
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Inception_B(),
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Reduction_B(), # Mixed_7a
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Inception_C(),
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Inception_C(),
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Inception_C(),
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)
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self.classif = nn.Linear(1536, num_classes)
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def get_classifier(self):
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return self.classif
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def reset_classifier(self, num_classes, global_pool='avg'):
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self.global_pool = global_pool
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self.num_classes = num_classes
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self.classif = nn.Linear(1536, num_classes)
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def forward_features(self, x, pool=True):
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x = self.features(x)
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if pool:
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x = select_adaptive_pool2d(x, self.global_pool, count_include_pad=False)
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x = x.view(x.size(0), -1)
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return x
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def forward(self, x):
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x = self.forward_features(x)
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if self.drop_rate > 0:
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x = F.dropout(x, p=self.drop_rate, training=self.training)
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x = self.classif(x)
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return x
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def inception_v4(pretrained=False, num_classes=1001, **kwargs):
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model = InceptionV4(num_classes=num_classes, **kwargs)
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if pretrained:
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model.load_state_dict(model_zoo.load_url(model_urls['imagenet']))
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return model
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