docs: public static InputPreProcessor getPreProcessorForInputTypeCnn3DLayers(InputType inputType, String layerName) {
          switch (inputType.getType()) {
              case FF:
                  log.info("Automatic addition of FF -> CNN3D preprocessors: not yet implemented (layer name: \""
                                  + layerName + "\")");
                  return null;
              case RNN:
                  log.warn("Automatic addition of RNN -> CNN3D preprocessors: not yet implemented (layer name: \""
                                  + layerName + "\")");
                  return null;
              // TODO: handle CNN to CNN3D
              case CNN3D:
                  return null;
              default:
                  throw new RuntimeException("Unknown input type: " + inputType);
          }
      }