code: def create(input_width, input_height, input_channels=1, output_dim=512):
      
      def instantiate(**_):
          return NatureCnn(
              input_width=input_width, input_height=input_height, input_channels=input_channels,
              output_dim=output_dim
          )
  
      return ModelFactory.generic(instantiate)
docs: Vel factory function