docs: public static void assertNOutSet(String layerType, String layerName, long layerIndex, long nOut) {
          if (nOut <= 0) {
              if (layerName == null)
                  layerName = "(name not set)";
              throw new DL4JInvalidConfigException(layerType + " (index=" + layerIndex + ", name=" + layerName + ") nOut="
                              + nOut + "; nOut must be > 0");
          }
      }