class VGG(nn.Module):
def __init__(self, features, num_classes=1000, init_weights=True):
super(VGG, self).__init__()
# ...
def forward(self, x):
x = self.features(x)
x = self.avgpool(x)
x = torch.flatten(x, 1) # < what you were asking about
x = self.classifier(x)
return x
class Bottleneck(nn.Module):
def __init__(self, inplanes, planes, stride=1, downsample=None, groups=1,
base_width=64, dilation=1, norm_layer=None):
super(Bottleneck, self).__init__()
# ...
def forward(self, x):
identity = x
out = self.conv1(x)
out = self.bn1(out)
out = self.relu(out)
out = self.conv2(out)
out = self.bn2(out)
out = self.relu(out)
out = self.conv3(out)
out = self.bn3(out)
if self.downsample is not None: # < conditional execution!
identity = self.downsample(x)
out += identity # < inplace operations
out = self.relu(out)
return out
pytorch通过张量的computational graph跟踪梯度,而不是通过函数。只要你的张量有^{} 属性,并且它们的^{} 不是
None
,你可以(几乎)做任何你喜欢的事情,并且仍然能够支持。只要您使用pytorch的操作(例如here和here中列出的操作),您就应该可以了
有关更多信息,请参见this
例如(取自torchvision's VGG implementation):
在torchvision's implementation of ResNet中可以看到一个更复杂的例子:
相关问题 更多 >
编程相关推荐