1x1 convolutions are simply point-wise linear combinations, and the number of output filters can be chosen (just like with any size filter), so you can choose to have fewer output filters than input channels. There is a thread about it here.
1x1 convolutions are simply point-wise linear combinations, and the number of output filters can be chosen (just like with any size filter), so you can choose to have fewer output filters than input channels. There is a thread about it here.