Applies low pass filter to the input image.

Args:

x: Tensor of shape $($b$,$ c$,$ m$,$ n$)$ where b is batch size

kernel: low pass filter to be applied to the image

Returns:

filtered$\_$image: Tensor of shape $($b$,$ c$,$ m$,$ n$)$

HINTS:

$-$ You should use the $2$d convolution operator from torch.nn$.$functional.

$-$ Make sure to pad the image appropriately $($it$\text{'}$s a parameter to the

convolution function you should use here!$).$

$-$ Pass self.n$\_$channels as the value to the "groups" parameter of the

convolution function. This represents the # of channels that the

filter will be applied to$.$