vgg = models.vgg19(pretrained=True).features.eval()
print (vgg)

class Vgg16(nn.Module):
  def __init__(self, pretrained=True):
    super(Vgg16, self).__init__()
    self.net = models.vgg16(pretrained).features.eval()
 
  def forward(self, x):
    out = []
    for i in range(len(self.net)):
      x = self.net[i](x)
      if i in [3, 8, 15, 22, 29]:
        # print(self.net[i])
        out.append(x
    return out