code: def extract_output_nc(model_config):
      """Extracts the number of channels at the output of the network form the model config"""
      if model_config.get("up_conv") is not None:
          output_nc = model_config.up_conv.up_conv_nn[-1][-1]
      elif model_config.get("innermost") is not None:
          output_nc = model_config.innermost.nn[-1]
      else:
          raise ValueError(
              "Input model_config does not match expected pattern"
          )
      return output_nc
  
label_desc: Use image node_id 1 for calling a global function with example usage: extract_output_nc(model_config) and returns: output_nc