demucs:
 H: 64
 L: 3
 encoder:
   conv1:
     kernel_size: 8
     stride: 2
   conv2:
     kernel_size: 1
     stride: 1

 decoder:
   conv1:
     kernel_size: 1
     stride: 1
   conv2:
     kernel_size: 8
     stride: 2