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# coding: utf-8
import torch.nn as nn
class C3D(nn.Module):
"""
nb_classes: nb_classes in classification task, 101 for UCF101 dataset
"""
def __init__(self, nb_classes):
super(C3D, self).__init__()
self.conv1 = nn.Conv3d(3, 64, kernel_size=(3, 3, 3), padding=(1, 1, 1))
self.pool1 = nn.MaxPool3d(kernel_size=(1, 2, 2), stride=(1, 2, 2))
self.conv2 = nn.Conv3d(64, 128, kernel_size=(3, 3, 3), padding=(1, 1, 1))
self.pool2 = nn.MaxPool3d(kernel_size=(2, 2, 2), stride=(2, 2, 2))
self.conv3a = nn.Conv3d(128, 256, kernel_size=(3, 3, 3), padding=(1, 1, 1))
self.conv3b = nn.Conv3d(256, 256, kernel_size=(3, 3, 3), padding=(1, 1, 1))
self.pool3 = nn.MaxPool3d(kernel_size=(2, 2, 2), stride=(2, 2, 2))
self.conv4a = nn.Conv3d(256, 512, kernel_size=(3, 3, 3), padding=(1, 1, 1))
self.conv4b = nn.Conv3d(512, 512, kernel_size=(3, 3, 3), padding=(1, 1, 1))
self.pool4 = nn.MaxPool3d(kernel_size=(2, 2, 2), stride=(2, 2, 2))
self.conv5a = nn.Conv3d(512, 512, kernel_size=(3, 3, 3), padding=(1, 1, 1))
self.conv5b = nn.Conv3d(512, 512, kernel_size=(3, 3, 3), padding=(1, 1, 1))
self.pool5 = nn.MaxPool3d(kernel_size=(2, 2, 2), stride=(2, 2, 2), padding=(0, 1, 1))
self.fc6 = nn.Linear(8192, 4096)
self.fc7 = nn.Linear(4096, 4096)
self.fc8 = nn.Linear(4096, nb_classes)
self.dropout = nn.Dropout(p=0.5)
self.relu = nn.ReLU()
def forward(self, x, feature_layer):
h = self.relu(self.conv1(x))
h = self.pool1(h)
h = self.relu(self.conv2(h))
h = self.pool2(h)
h = self.relu(self.conv3a(h))
h = self.relu(self.conv3b(h))
h = self.pool3(h)
h = self.relu(self.conv4a(h))
h = self.relu(self.conv4b(h))
h = self.pool4(h)
h = self.relu(self.conv5a(h))
h = self.relu(self.conv5b(h))
h = self.pool5(h)
h = h.reshape(-1, 8192)
out = h if feature_layer == 5 else None
h = self.relu(self.fc6(h))
out = h if feature_layer == 6 and out == None else out
h = self.dropout(h)
h = self.relu(self.fc7(h))
out = h if feature_layer == 7 and out == None else out
h = self.dropout(h)
logits = self.fc8(h)
return logits, out
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