Add inceptionv4 pretrained model

torchvision/models/__init__.py

@@ -4,6 +4,7 @@
 -  `AlexNet`_
 -  `VGG`_
 -  `ResNet`_
+_  `InceptionV4`_
 
 You can construct a model with random weights by calling its constructor:
 
@@ -12,6 +13,7 @@
     import torchvision.models as models
     resnet18 = models.resnet18()
     alexnet = models.alexnet()
+    inceptionv4 = models.inceptionv4()
 
 We provide pre-trained models for the ResNet variants and AlexNet, using the
 PyTorch :mod:`torch.utils.model_zoo`. These can  constructed by passing
@@ -22,12 +24,15 @@
     import torchvision.models as models
     resnet18 = models.resnet18(pretrained=True)
     alexnet = models.alexnet(pretrained=True)
+    inceptionv4 = models.inceptionv4(pretrained=True)
 
 .. _AlexNet: https://arxiv.org/abs/1404.5997
 .. _VGG: https://arxiv.org/abs/1409.1556
 .. _ResNet: https://arxiv.org/abs/1512.03385
+.. _InceptionV4: https://arxiv.org/abs/1602.07261
 """
 
 from .alexnet import *
 from .resnet import *
 from .vgg import *
+from .inceptionv4 import *

torchvision/models/inceptionv4.py

@@ -0,0 +1,272 @@
+import torch.nn as nn
+import torch.utils.model_zoo as model_zoo
+
+__all__ = ['InceptionV4', 'inceptionv4']
+
+model_urls = {
+    'inceptionv4': 'https://s3.amazonaws.com/pytorch/models/inceptionv4-58153ba9.pth'
+}
+
+class BasicConv2d(nn.Module):
+
+    def __init__(self, in_planes, out_planes, kernel_size, stride, padding=0):
+        super(BasicConv2d, self).__init__()
+        self.conv = nn.Conv2d(in_planes, out_planes, kernel_size=kernel_size, stride=stride, padding=padding, bias=False) # verify bias false
+        self.bn = nn.BatchNorm2d(out_planes, eps=0.001, momentum=0, affine=True)
+        self.relu = nn.ReLU(inplace=True)
+
+    def forward(self, x):
+        x = self.conv(x)
+        x = self.bn(x)
+        x = self.relu(x)
+        return x
+
+class Mixed_3a(nn.Module):
+
+    def __init__(self):
+        super(Mixed_3a, self).__init__()
+        self.maxpool = nn.MaxPool2d(3, stride=2)
+        self.conv = BasicConv2d(64, 96, kernel_size=3, stride=2)
+
+    def forward(self, x):
+        x0 = self.maxpool(x)
+        x1 = self.conv(x)
+        out = torch.cat((x0, x1), 1)
+        return out
+
+class Mixed_4a(nn.Module):
+
+    def __init__(self):
+        super(Mixed_4a, self).__init__()
+
+        self.block0 = nn.Sequential(
+            BasicConv2d(160, 64, kernel_size=1, stride=1),
+            BasicConv2d(64, 96, kernel_size=3, stride=1)
+        )
+
+        self.block1 = nn.Sequential(
+            BasicConv2d(160, 64, kernel_size=1, stride=1),
+            BasicConv2d(64, 64, kernel_size=(1,7), stride=1, padding=(0,3)),
+            BasicConv2d(64, 64, kernel_size=(7,1), stride=1, padding=(3,0)),
+            BasicConv2d(64, 96, kernel_size=(3,3), stride=1)
+        )
+
+    def forward(self, x):
+        x0 = self.block0(x)
+        x1 = self.block1(x)
+        out = torch.cat((x0, x1), 1)
+        return out
+
+class Mixed_5a(nn.Module):
+
+    def __init__(self):
+        super(Mixed_5a, self).__init__()
+        self.conv = BasicConv2d(192, 192, kernel_size=3, stride=2)
+        self.maxpool = nn.MaxPool2d(3, stride=2)
+
+    def forward(self, x):
+        x0 = self.conv(x)
+        x1 = self.maxpool(x)
+        out = torch.cat((x0, x1), 1)
+        return out
+
+class Inception_A(nn.Module):
+
+    def __init__(self):
+        super(Inception_A, self).__init__()
+        self.block0 = BasicConv2d(384, 96, kernel_size=1, stride=1)
+
+        self.block1 = nn.Sequential(
+            BasicConv2d(384, 64, kernel_size=1, stride=1),
+            BasicConv2d(64, 96, kernel_size=3, stride=1, padding=1)
+        )
+
+        self.block2 = nn.Sequential(
+            BasicConv2d(384, 64, kernel_size=1, stride=1),
+            BasicConv2d(64, 96, kernel_size=3, stride=1, padding=1),
+            BasicConv2d(96, 96, kernel_size=3, stride=1, padding=1)
+        )
+
+        self.block3 = nn.Sequential(
+            nn.AvgPool2d(3, stride=1, padding=1, count_include_pad=False),
+            BasicConv2d(384, 96, kernel_size=1, stride=1)
+        )
+
+    def forward(self, x):
+        x0 = self.block0(x)
+        x1 = self.block1(x)
+        x2 = self.block2(x)
+        x3 = self.block3(x)
+        out = torch.cat((x0, x1, x2, x3), 1)
+        return out
+
+class Reduction_A(nn.Module):
+
+    def __init__(self):
+        super(Reduction_A, self).__init__()
+        self.block0 = BasicConv2d(384, 384, kernel_size=3, stride=2)
+
+        self.block1 = nn.Sequential(
+            BasicConv2d(384, 192, kernel_size=1, stride=1),
+            BasicConv2d(192, 224, kernel_size=3, stride=1, padding=1),
+            BasicConv2d(224, 256, kernel_size=3, stride=2)
+        )
+
+        self.block2 = nn.MaxPool2d(3, stride=2)
+
+    def forward(self, x):
+        x0 = self.block0(x)
+        x1 = self.block1(x)
+        x2 = self.block2(x)
+        out = torch.cat((x0, x1, x2), 1)
+        return out
+
+class Inception_B(nn.Module):
+
+    def __init__(self):
+        super(Inception_B, self).__init__()
+        self.block0 = BasicConv2d(1024, 384, kernel_size=1, stride=1)
+
+        self.block1 = nn.Sequential(
+            BasicConv2d(1024, 192, kernel_size=1, stride=1),
+            BasicConv2d(192, 224, kernel_size=(1,7), stride=1, padding=(0,3)),
+            BasicConv2d(224, 256, kernel_size=(7,1), stride=1, padding=(3,0))
+        )
+
+        self.block2 = nn.Sequential(
+            BasicConv2d(1024, 192, kernel_size=1, stride=1),
+            BasicConv2d(192, 192, kernel_size=(7,1), stride=1, padding=(3,0)),
+            BasicConv2d(192, 224, kernel_size=(1,7), stride=1, padding=(0,3)),
+            BasicConv2d(224, 224, kernel_size=(7,1), stride=1, padding=(3,0)),
+            BasicConv2d(224, 256, kernel_size=(1,7), stride=1, padding=(0,3))
+        )
+
+        self.block3 = nn.Sequential(
+            nn.AvgPool2d(3, stride=1, padding=1, count_include_pad=False),
+            BasicConv2d(1024, 128, kernel_size=1, stride=1)
+        )
+
+    def forward(self, x):
+        x0 = self.block0(x)
+        x1 = self.block1(x)
+        x2 = self.block2(x)
+        x3 = self.block3(x)
+        out = torch.cat((x0, x1, x2, x3), 1)
+        return out
+
+class Reduction_B(nn.Module):
+
+    def __init__(self):
+        super(Reduction_B, self).__init__()
+
+        self.block0 = nn.Sequential(
+            BasicConv2d(1024, 192, kernel_size=1, stride=1),
+            BasicConv2d(192, 192, kernel_size=3, stride=2)
+        )
+
+        self.block1 = nn.Sequential(
+            BasicConv2d(1024, 256, kernel_size=1, stride=1),
+            BasicConv2d(256, 256, kernel_size=(1,7), stride=1, padding=(0,3)),
+            BasicConv2d(256, 320, kernel_size=(7,1), stride=1, padding=(3,0)),
+            BasicConv2d(320, 320, kernel_size=3, stride=2)
+        )
+
+        self.block2 = nn.MaxPool2d(3, stride=2)
+
+    def forward(self, x):
+        x0 = self.block0(x)
+        x1 = self.block1(x)
+        x2 = self.block2(x)
+        out = torch.cat((x0, x1, x2), 1)
+        return out
+
+class Inception_C(nn.Module):
+
+    def __init__(self):
+        super(Inception_C, self).__init__()
+        self.block0 = BasicConv2d(1536, 256, kernel_size=1, stride=1)
+
+        self.block1_0 = BasicConv2d(1536, 384, kernel_size=1, stride=1)
+        self.block1_1a = BasicConv2d(384, 256, kernel_size=(1,3), stride=1, padding=(0,1))
+        self.block1_1b = BasicConv2d(384, 256, kernel_size=(3,1), stride=1, padding=(1,0))
+
+        self.block2_0 = BasicConv2d(1536, 384, kernel_size=1, stride=1)
+        self.block2_1 = BasicConv2d(384, 448, kernel_size=(3,1), stride=1, padding=(1,0))
+        self.block2_2 = BasicConv2d(448, 512, kernel_size=(1,3), stride=1, padding=(0,1))
+        self.block2_3a = BasicConv2d(512, 256, kernel_size=(1,3), stride=1, padding=(0,1))
+        self.block2_3b = BasicConv2d(512, 256, kernel_size=(3,1), stride=1, padding=(1,0))
+
+        self.block3 = nn.Sequential(
+            nn.AvgPool2d(3, stride=1, padding=1, count_include_pad=False),
+            BasicConv2d(1536, 256, kernel_size=1, stride=1)
+        )
+
+    def forward(self, x):
+        x0 = self.block0(x)
+
+        x1_0 = self.block1_0(x)
+        x1_1a = self.block1_1a(x1_0)
+        x1_1b = self.block1_1b(x1_0)
+        x1 = torch.cat((x1_1a, x1_1b), 1)
+
+        x2_0 = self.block2_0(x)
+        x2_1 = self.block2_1(x2_0)
+        x2_2 = self.block2_2(x2_1)
+        x2_3a = self.block2_3a(x2_2)
+        x2_3b = self.block2_3b(x2_2)
+        x2 = torch.cat((x2_3a, x2_3b), 1)
+
+        x3 = self.block3(x)
+
+        out = torch.cat((x0, x1, x2, x3), 1)
+        return out
+
+class InceptionV4(nn.Module):
+
+    def __init__(self, num_classes=1001):
+        super(InceptionV4, self).__init__()
+        self.features = nn.Sequential(
+            BasicConv2d(3, 32, kernel_size=3, stride=2),
+            BasicConv2d(32, 32, kernel_size=3, stride=1),
+            BasicConv2d(32, 64, kernel_size=3, stride=1, padding=1),
+            Mixed_3a(),
+            Mixed_4a(),
+            Mixed_5a(),
+            Inception_A(),
+            Inception_A(),
+            Inception_A(),
+            Inception_A(),
+            Reduction_A(), # Mixed_6a
+            Inception_B(),
+            Inception_B(),
+            Inception_B(),
+            Inception_B(),
+            Inception_B(),
+            Inception_B(),
+            Inception_B(),
+            Reduction_B(), # Mixed_7a
+            Inception_C(),
+            Inception_C(),
+            Inception_C(),
+            nn.AvgPool2d(8, count_include_pad=False)
+        )
+        self.classif = nn.Linear(1536, num_classes)
+
+    def forward(self, x):
+        x = self.features(x)
+        x = x.view(x.size(0), -1)
+        x = self.classif(x) 
+        return x
+
+
+def inceptionv4(pretrained=False):
+    r"""InceptionV4 model architecture from the
+    `"Inception-v4, Inception-ResNet..." <https://arxiv.org/abs/1602.07261>`_ paper.
+
+    Args:
+        pretrained (bool): If True, returns a model pre-trained on ImageNet
+    """
+    model = InceptionV4()
+    if pretrained:
+        model.load_state_dict(model_zoo.load_url(model_urls['inceptionv4']))
+    return model