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337 lines
11 KiB
337 lines
11 KiB
""" Pytorch Inception-Resnet-V2 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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import numpy as np
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from .adaptive_avgmax_pool import *
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model_urls = {
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'imagenet': 'http://data.lip6.fr/cadene/pretrainedmodels/inceptionresnetv2-520b38e4.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=.001)
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self.relu = nn.ReLU(inplace=False)
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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_5b(nn.Module):
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def __init__(self):
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super(Mixed_5b, self).__init__()
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self.branch0 = BasicConv2d(192, 96, kernel_size=1, stride=1)
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self.branch1 = nn.Sequential(
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BasicConv2d(192, 48, kernel_size=1, stride=1),
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BasicConv2d(48, 64, kernel_size=5, stride=1, padding=2)
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)
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self.branch2 = nn.Sequential(
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BasicConv2d(192, 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(192, 64, 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 Block35(nn.Module):
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def __init__(self, scale=1.0):
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super(Block35, self).__init__()
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self.scale = scale
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self.branch0 = BasicConv2d(320, 32, kernel_size=1, stride=1)
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self.branch1 = nn.Sequential(
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BasicConv2d(320, 32, kernel_size=1, stride=1),
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BasicConv2d(32, 32, kernel_size=3, stride=1, padding=1)
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)
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self.branch2 = nn.Sequential(
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BasicConv2d(320, 32, kernel_size=1, stride=1),
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BasicConv2d(32, 48, kernel_size=3, stride=1, padding=1),
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BasicConv2d(48, 64, kernel_size=3, stride=1, padding=1)
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)
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self.conv2d = nn.Conv2d(128, 320, kernel_size=1, stride=1)
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self.relu = nn.ReLU(inplace=False)
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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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out = self.conv2d(out)
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out = out * self.scale + x
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out = self.relu(out)
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return out
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class Mixed_6a(nn.Module):
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def __init__(self):
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super(Mixed_6a, self).__init__()
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self.branch0 = BasicConv2d(320, 384, kernel_size=3, stride=2)
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self.branch1 = nn.Sequential(
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BasicConv2d(320, 256, kernel_size=1, stride=1),
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BasicConv2d(256, 256, kernel_size=3, stride=1, padding=1),
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BasicConv2d(256, 384, 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 Block17(nn.Module):
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def __init__(self, scale=1.0):
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super(Block17, self).__init__()
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self.scale = scale
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self.branch0 = BasicConv2d(1088, 192, kernel_size=1, stride=1)
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self.branch1 = nn.Sequential(
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BasicConv2d(1088, 128, kernel_size=1, stride=1),
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BasicConv2d(128, 160, kernel_size=(1, 7), stride=1, padding=(0, 3)),
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BasicConv2d(160, 192, kernel_size=(7, 1), stride=1, padding=(3, 0))
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)
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self.conv2d = nn.Conv2d(384, 1088, kernel_size=1, stride=1)
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self.relu = nn.ReLU(inplace=False)
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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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out = self.conv2d(out)
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out = out * self.scale + x
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out = self.relu(out)
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return out
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class Mixed_7a(nn.Module):
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def __init__(self):
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super(Mixed_7a, self).__init__()
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self.branch0 = nn.Sequential(
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BasicConv2d(1088, 256, kernel_size=1, stride=1),
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BasicConv2d(256, 384, kernel_size=3, stride=2)
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)
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self.branch1 = nn.Sequential(
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BasicConv2d(1088, 256, kernel_size=1, stride=1),
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BasicConv2d(256, 288, kernel_size=3, stride=2)
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)
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self.branch2 = nn.Sequential(
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BasicConv2d(1088, 256, kernel_size=1, stride=1),
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BasicConv2d(256, 288, kernel_size=3, stride=1, padding=1),
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BasicConv2d(288, 320, kernel_size=3, stride=2)
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)
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self.branch3 = 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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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 Block8(nn.Module):
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def __init__(self, scale=1.0, noReLU=False):
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super(Block8, self).__init__()
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self.scale = scale
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self.noReLU = noReLU
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self.branch0 = BasicConv2d(2080, 192, kernel_size=1, stride=1)
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self.branch1 = nn.Sequential(
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BasicConv2d(2080, 192, kernel_size=1, stride=1),
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BasicConv2d(192, 224, kernel_size=(1, 3), stride=1, padding=(0, 1)),
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BasicConv2d(224, 256, kernel_size=(3, 1), stride=1, padding=(1, 0))
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)
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self.conv2d = nn.Conv2d(448, 2080, kernel_size=1, stride=1)
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if not self.noReLU:
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self.relu = nn.ReLU(inplace=False)
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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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out = self.conv2d(out)
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out = out * self.scale + x
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if not self.noReLU:
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out = self.relu(out)
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return out
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class InceptionResnetV2(nn.Module):
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def __init__(self, num_classes=1001, drop_rate=0., global_pool='avg'):
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super(InceptionResnetV2, 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.conv2d_1a = BasicConv2d(3, 32, kernel_size=3, stride=2)
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self.conv2d_2a = BasicConv2d(32, 32, kernel_size=3, stride=1)
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self.conv2d_2b = BasicConv2d(32, 64, kernel_size=3, stride=1, padding=1)
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self.maxpool_3a = nn.MaxPool2d(3, stride=2)
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self.conv2d_3b = BasicConv2d(64, 80, kernel_size=1, stride=1)
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self.conv2d_4a = BasicConv2d(80, 192, kernel_size=3, stride=1)
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self.maxpool_5a = nn.MaxPool2d(3, stride=2)
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self.mixed_5b = Mixed_5b()
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self.repeat = nn.Sequential(
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Block35(scale=0.17),
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Block35(scale=0.17),
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Block35(scale=0.17),
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Block35(scale=0.17),
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Block35(scale=0.17),
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Block35(scale=0.17),
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Block35(scale=0.17),
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Block35(scale=0.17),
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Block35(scale=0.17),
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Block35(scale=0.17)
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)
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self.mixed_6a = Mixed_6a()
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self.repeat_1 = nn.Sequential(
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Block17(scale=0.10),
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Block17(scale=0.10),
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Block17(scale=0.10),
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Block17(scale=0.10),
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Block17(scale=0.10),
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Block17(scale=0.10),
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Block17(scale=0.10),
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Block17(scale=0.10),
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Block17(scale=0.10),
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Block17(scale=0.10),
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Block17(scale=0.10),
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Block17(scale=0.10),
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Block17(scale=0.10),
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Block17(scale=0.10),
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Block17(scale=0.10),
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Block17(scale=0.10),
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Block17(scale=0.10),
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Block17(scale=0.10),
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Block17(scale=0.10),
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Block17(scale=0.10)
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)
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self.mixed_7a = Mixed_7a()
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self.repeat_2 = nn.Sequential(
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Block8(scale=0.20),
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Block8(scale=0.20),
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Block8(scale=0.20),
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Block8(scale=0.20),
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Block8(scale=0.20),
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Block8(scale=0.20),
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Block8(scale=0.20),
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Block8(scale=0.20),
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Block8(scale=0.20)
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)
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self.block8 = Block8(noReLU=True)
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self.conv2d_7b = BasicConv2d(2080, 1536, kernel_size=1, stride=1)
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self.num_features = 1536
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self.last_linear = 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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del self.classif
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if num_classes:
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self.last_linear = torch.nn.Linear(1536, num_classes)
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else:
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self.last_linear = None
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def trim_classifier(self, trim=1):
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self.num_classes -= trim
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new_last_linear = nn.Linear(1536, self.num_classes)
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new_last_linear.weight.data = self.last_linear.weight.data[trim:]
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new_last_linear.bias.data = self.last_linear.bias.data[trim:]
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self.last_linear = new_last_linear
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def forward_features(self, x, pool=True):
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x = self.conv2d_1a(x)
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x = self.conv2d_2a(x)
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x = self.conv2d_2b(x)
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x = self.maxpool_3a(x)
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x = self.conv2d_3b(x)
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x = self.conv2d_4a(x)
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x = self.maxpool_5a(x)
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x = self.mixed_5b(x)
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x = self.repeat(x)
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x = self.mixed_6a(x)
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x = self.repeat_1(x)
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x = self.mixed_7a(x)
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x = self.repeat_2(x)
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x = self.block8(x)
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x = self.conv2d_7b(x)
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if pool:
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x = adaptive_avgmax_pool2d(x, self.global_pool)
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#x = F.avg_pool2d(x, 8, 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, pool=True)
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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.last_linear(x)
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return x
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def inception_resnet_v2(pretrained=False, num_classes=1000, **kwargs):
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r"""InceptionResnetV2 model architecture from the
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`"InceptionV4, Inception-ResNet..." <https://arxiv.org/abs/1602.07261>`_ paper.
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Args:
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pretrained ('string'): If True, returns a model pre-trained on ImageNet
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"""
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extra_class = 1 if pretrained else 0
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model = InceptionResnetV2(num_classes=num_classes + extra_class, **kwargs)
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if pretrained:
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print('Loading pretrained from %s' % model_urls['imagenet'])
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model.load_state_dict(model_zoo.load_url(model_urls['imagenet']))
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model.trim_classifier()
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return model
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