conv flag

>>> nn.Conv2d(in_channels, v, kernel_size=(1, 3)[True])
Conv2d(1024, 256, kernel_size=(3, 3), stride=(1, 1))
>>> nn.Conv2d(in_channels, v, kernel_size=(1, 3)[False])
Conv2d(1024, 256, kernel_size=(1, 1), stride=(1, 1))